The Hebrew University holds regularly seminars, workshops and programs related to quantum science.
Periodically, these events are given by specially invited distinguished guests from all around the world.
For your convenience, on the right side of this site you can find a calendar detailing past and future events
organized by the Hebrew University Quantum Information Science Center.
Diamond Architectures for Quantum Computing and Sensing
February 13th16th, Mishkenot Sha'ananim conference center
Conference Chair  Dr. Nir BarGill, The Hebrew University
The Hebrew University and the University of Melbourne are organizing a workshop on Diamond Architectures for Quantum Computing and Sensing,
which will be held at the Mishkenot Sha'ananim conference center, between February 1316. The scientific program, speaker list and all other relevant
information can be found on the workshop website: http://www.daqcs2017.com.
Special OSA Chapter Seminar
Tuesday, December 13th 2016, The Hebrew University, Danciger B building seminar room 16:00 o'clock
Prof. Jonathan Dowling, Hearne Institute for Theoretical Physics, Department of Physics & Astronomy, Louisiana State University
"Quantum optical technologies for metrology, sensing and imaging"
Over the past 20 years, bright sources of entangled photons have led to a renaissance in quantum optical interferometry.
Optical interferometry has been used to test the foundations of quantum mechanics and implement some of the novel ideas
associated with quantum entanglement such as quantum teleportation, quantum cryptography, quantum lithography, quantum
computing logic gates, and quantum metrology. In this paper, we focus on the new ways that have been developed to exploit
quantum optical entanglement in quantum metrology to beat the shotnoise limit, which can be used, e.g., in fiber optical
gyroscopes and in sensors for biological or chemical targets. We also discuss how this entanglement can be used to beat the
Rayleigh diffraction limit in imaging systems such as in LIDAR and optical lithography and microscopes.
ETH ZurichHUJI Quantum Technologies Workshop
Sunday, November 20th 2016, The Hebrew University, Jerusalem
ETH Zurich and The Hebrew University will hold a joint two days workshop on quantum technologies in Jerusalem.
Sunday, November 20th (Beit Belgia)
 18:0019:00 Arrival, Reception and Dinner
 19:0019:10 Greetings – Nadav Katz and Andreas Wallraff
 19:1019:40 Alex Retzker, HUJI New methods for high frequency resolution measurements
 19:4020:10 Martin Frimmer (Novotny group), ETH Optomechanical oscillators: Coherent control and the photon recoil limit
 20:1522:30 Bus back to Hotel, and evening walk in Jerusalem (for whomever is interested)
Monday, November 21st (Beit Breter)
 09:0009:30 Introduction and greetings:
Prof. Isaiah (Shy) Arkin, HUJI VP for R&D
Prof. Lino Guzzella, ETH president
Prof. Jay Fineberg, HUJI Dean of the Faculty of Sciences
Prof. Klaus Ensslin, ETH (representative of NCCR QSIT)
Prof. Nadav Katz, HUJI
 09:3010:00 Jonathan Home, ETH Dissipative sensing and quantum state engineering with trapped atomic ions
 10:0010:30 Nadav Katz, HUJI Superconducting circuits  how far are we from quantum supremacy?
 10:3011:00 Renato Renner, ETH True randomness from quantum devices
 11:0011:30 Coffee break
 11:3012:00 Hadar Steinberg, HUJI Tunneling spectroscopy of NbSe_{2} in vanderWaals devices
 12:0012:30 Klaus Ensslin, ETH Fermionic cavities and spin coherence
 12:3014:00 Lunch
 14:0016:00 Lab tours: Hagai Eisenberg, Yossi Paltiel, Nir BarGill
 16:0016:30 Coffee break
 16:3017:00 Uriel Levy, HUJI Linear and nonlinear lightvapour interactions on a chip
 17:0017:30 Andreas Wallraff, ETH Quantum Science and Technology with Superconducting Circuits
 17:3018:00 Ronen Rapaport, HUJI From singlebody to manybody quantum physics in semiconductor nanostructures
 18:0018:30 Sebastian Huber, ETH Quantum inspired engineering: The next generation mechanical metamaterials
 18:3020:00 Posters + light dinner and beer
 20:00 Bus to Rehovot
Summer Research Scholarships in Quantum Information and Quantum Control
University of Toronto, Canada
The Center for Quantum Information and Quantum Control (CQIQC),
located at the University of Toronto, is accepting applications for Prize
Scholarships for Undergraduate Students to undertake Summer Research
Projects at the University of Toronto in 2016. CQIQC will provide funds for
students to spend the summer working in one of the research groups associated with the Center.
Application information
CQIQC
Special Quantum Information Seminar  Einstein and Quantum Mechanics: It’s Not What You Think
Wednesday, July 15th 2015, The Hebrew University, Danciger B building seminar room 13:00 o'clock
Prof. A. Douglas Stone, Yale University, Applied Physics
Einstein is well known for his rejection of quantum mechanics in the form it emerged from the work of Heisenberg,
Born and Schrodinger in 1926. Much less appreciated are the many seminal contributions he made to quantum theory
prior to his final scientific verdict, that the theory was at best incomplete. In this talk I present an overview
of Einstein’s many conceptual breakthroughs and place them in historical context. I argue that Einstein, much more
than Planck, introduced the concept of quantization of energy in atomic mechanics. Einstein proposed the photon,
the first forcecarrying particle discovered for a fundamental interaction, and put forward the notion of waveparticle
duality, based on sound statistical arguments 14 years before De Broglie’s work. He was the first to recognize the
intrinsic randomness in atomic processes, and introduced the notion of transition probabilities, embodied in the A
and B coefficients for atomic emission and absorption. He also preceded Born in suggesting the interpretation of
wave fields as probability densities for particles, photons, in the case of the electromagnetic field. Finally,
stimulated by Bose, he introduced the notion of indistinguishable particles in the quantum sense and derived the
condensed phase of bosons, which is one of the fundamental states of matter at low temperatures. His work on quantum
statistics in turn directly stimulated Schrodinger towards his discovery of the wave equation of quantum mechanics.
It was only due to his rejection of the final theory that he is not generally recognized as the most central figure
in this historic achievement of human civilization.
Prof. Jonathan Dowling  Scheduled lectures and seminars
Monday, June 15th 2015, The Hebrew University, Levin Hall no.8 12:00 o'clock
Prof. Jonathan Dowling, Hearne Institute for Theoretical Physics, Louisiana State University
"Schrödinger’s Rainbow: The Renaissance in Quantum Optical Interferometry"
Over the past 20 years bright sources of entangled photons have lead to a renaissance in quantum optical interferometry.
These photon sources have been used to test the foundations of quantum mechanics and implement some of the spooky ideas
associated with quantum entanglement such as quantum teleportation, quantum cryptography, quantum lithography, quantum
computing logic gates, and subshotnoise optical interferometers. I will discuss some of these advances and the unification
of optical quantum imaging, metrology, and information processing.
Wednesday, June 17th 2015, The Hebrew University, Danziger B seminar room 14:00 o'clock
Prof. Jonathan Dowling, Hearne Institute for Theoretical Physics, Louisiana State University
"Linear Optical Quantum Metrology with Single Photons: Exploiting Spontaneously Generated Entanglement to Beat the ShotNoise Limit"
Quantum numberpath entanglement is a resource for supersensitive quantum metrology and in particular provides for subshot
noise or even Heisenberglimited sensitivity. However, such numberpath entanglement has thought to have been resource intensive
to create in the first place  typically requiring either very strong nonlinearities, or nondeterministic preparation schemes
with feedforward, which are difficult to implement. Very recently, arising from the study of quantum random walks with multiphoton
walkers, as well as the study of the computational complexity of passive linear optical interferometers fed with singlephoton inputs,
it has been shown that such passive linear optical devices generate a superexponentially large amount of numberpath entanglement.
A logical question to ask is whether this entanglement may be exploited for quantum metrology. We answer that question here in the
affirmative by showing that a simple, passive, linearoptical interferometer  fed with only uncorrelated, singlephoton inputs,
coupled with simple, singlemode, disjoint photodetection  is capable of significantly beating the shotnoise limit. Our result
implies a pathway forward to practical quantum metrology with readily available technology.
Thursday, June 18th 2015, The Hebrew University, New Engineering Bld. building A, end of corridor on 3rd floor, 12:00 o'clock
Prof. Jonathan Dowling, Hearne Institute for Theoretical Physics, Louisiana State University
"Inefficiency of classically simulating linear optical quantum computing with Fockstate inputs"
Aaronson and Arkhipov recently used computational complexity theory to argue that classical computers very likely cannot efficiently
simulate linear, multimode, quantumoptical interferometers with arbitrary Fockstate inputs [Aaronson and Arkhipov, Theory
Comput. 9, 143 (2013)]. Here we present an elementary argument that utilizes only techniques from quantum optics. We explicitly
construct the Hilbert space for such an interferometer and show that its dimension scales exponentially with all the physical resources
We also show in a simple example just how the Schrödinger and Heisenberg pictures of quantum theory, while mathematically equivalent,
are not in general computationally equivalent. We conclude our argument by comparing the symmetry requirements of multiparticle bosonic
to fermionic interferometers and, using simple physical reasoning, connect the nonsimulatability of the bosonic device to the complexit
of computing the permanent of a large matrix. Finally we discuss our recent work on timebinned Boson Sampling and Boson Sampling with
nonclassical states of light other than Fock states, such as Schrödingercat states, photonadded or subtracted squeezed states, and
photonadded coherent states.
The 6^{th} Peter Brojde Conference  Quantum Biology
Tuesday, June 16th 2015, The Neve Ilan Hotel
In recent years, several studies have indicated that "nontrivial" quantum
features such as superposition, nonlocality, entanglement and tunneling may
be manifested in a number of biological processes. These findings give rise to a
new area of research: “Quantum Biology”.
Some examples of the biological phenomena that have been studied in terms
of quantum processes are the absorbance of frequencyspecific radiation (i.e.,
photosynthesis and vision); the conversion of chemical energy into motion;
magnetoreception in animals, DNA mutation, and brownian motors in many
cellular processes.
The research of quantum biology is still at its fledgling phase, and its essence
is under intense debate. However, it bears the potential to be of paramount
importance for the understanding of biological phenomena at the
fundamental level, and may induce in the future the physical chassis for
implementing quantum computing concept
The sixth Peter Brojde Conference at
explore recent development in this field.
Free registration here
Registration for free transportation from HUJI here
The conference schedule:
 08:4509:15 Registration
 09:1509:30 Welcome
 09:3010:15 Prof. Martin Plenio, Ulm University “Quanta, Vibrations and Biology”
 10:1510:45 Prof. Yossi Paltiel, The Hebrew University of Jerusalem “Quantum Random Walk in Biological Phycocyanin Nanowires”
 10:4511:15 Coffee break
 11:1511:45 Ms. Nirit KantorUriel, The Weizman Institute of Science “How to measure spin polarization in electron transfer through bio systems?”
 11:4512:15 Prof. Ronnie Kosloff, The Hebrew University of Jerusalem
 12:1512:45 Prof. Nir Keren, The Hebrew University of Jerusalem “An easily reversible structural change underlies mechanisms enabling desert crust cyanobacteria to survive desiccation”
 12:4514:00 Lunch
 14:0014:30 Prof. Noam Adir, TechnionIsrael Institute of Technology “Does the structure of the Phycobilisome photosynthetic antenna complex help decipher its energy transfer properties?”
 14:3015:15 Prof. Richard Cogdell, University of Glasgow “How ‘strange’ is photosynthetic light harvesting?”
 15:1515:30 Prof. Ronny Agranat, The Hebrew University of Jerusalem Concluding Remarks
Dipolar Fluids on a Chip – From Quantum Physics to Complex Circuitry
Wednesday, May 6th 2015, The Hebrew University, Bergman building seminar room 12:00 o'clock
Prof. Ronen Rapaport, The Hebrew University
While we understand well how two classical dipoles interact with each other, the problem becomes much more complex and interesting when we put many dipoles together and form a dipolar fluid, especially when collective quantum effects become important. A dipolar exciton fluid in a semiconductor bilayer is a wonderful system to look for the very rich quantumcollective physics that is theoretically predicted for ultracold dipoles. Furthermore, these exciton fluids can be utilized for new types of circuitry on a chip.
I will give an overview of the recent research highlights on dipolar exciton fluids, with many new exciting observations such as a transition from a classical to a quantum correlated fluid, evidences for a macroscopic formation of an incompressible dark liquid, as well as observations of very long spin lifetimes. I will also present some proofofprinciple experiments of building blocks for a complex excitonic circuitry and of the ability to form dipolar molecules with outofplane interactions.
HUJI OSA Chapter Event
Wednesday, April 29th 2015, The Hebrew University, Brandman Laboratory Building 15:00 o'clock
The Hebrew University OSA Chapter
The Hebrew University Optical Society of America (OSA) chapter is hosting a special event
within the announced International Year of Light (2015). The event's
goal is to present the HUJI chapter's activities and ambitions by exposing them to a wider audience.
The event will feature talks by Prof. Hagai Eisenberg (HUJI) and Dr. Eyal Shekel (CEO, Sivan). To conclude, refreshments and
more will be served. The full itinerary:
 15:00  15:15 Gathering and light refreshments
 15:15  15:30 Introduction and presentation of the HUJI OSA chapter

15:30  16:30
Academia talk: "Quantum Computation Using Entangled Photons",
Prof. Hagai Eisenberg, The Hebrew University
 16:30  17:00 Recess, light refreshments

17:00  18:00
Industry talk: "High Power Laser Assembly with Coherent Addition of SemiConductor Optical Amplifiers",
Dr. Eyal Shekel, Sivan CEO (Jerusalem)
 18:00  19:00 Conclusion and refreshments
Please be advised that (free) registration is required.
Atomic dipoledipole interactions at very long distances
Wednesday, January 21st 2015, The Hebrew University, Bergman building seminar room 12:00 o'clock
Prof. Roee Ozeri, The Weizmann Insitute
Electric and magnetic dipolar interactions between atoms are ubiquitous. In many cases they are responsible
for the formation of molecules, the emergence of magnetism, as well as many other physical phenomena.
Usually these interactions decay as the cube of the distance between atoms and are therefore dominant
only on atomic scale separations between atoms. Here I’ll describe the measurement of dipolar interactions
between atomic ions that are separated by several micrometers in trappedion crystals. I’ll describe the
measurement of the magnetic dipolar interaction between the two valence electrons of two ions as well as
the collective Lambshift which arises from resonant electric dipole interaction between ions.
[1] Measurement of the magnetic interaction between two bound electrons of two separate ions, Shlomi Kotler, Nitzan Akerman, Nir Navon, Yinnon Glickman, Roee Ozeri, Nature 510, 376 (2014)
[2] Cooperative Lamb shift in a mesoscopic atomic array, Ziv Meir, Osip Schwartz, Ephraim Shahmoon, Dan Oron, Roee Ozeri, Phys. Rev. Lett. 113, 193002 (2014)
Achievable reality or unrealistic dream  APS Quantum computing workshop
Tuesday, January 6th 2015, The Hebrew University, Danciger B seminar room 16:00 o'clock
Quantum Information Science Center
An APS quantum computing workshop will take place on Tuesday, January 6^{th}, for the general audience.
In the program:
 16.00  16.10 Prof. M. Ya. Amusia "Introductory remarks"
 16.10  17.00 Prof. G. Kalai "What can we learn from a failure of quantum computers"
 17.00  17.50 Prof. N. Katz "Quantum information science  the state of the art"
 17.50  18.15 General discussion
All interested, including students, are welcomed.
Refreshments will be served in the lobby of Danciger B building, from 15.45.
Physics Colloquium  When Exactly Do Quantum Computers Provide a Speedup?
Monday, January 5th 2015, The Hebrew University, Levin Building, Lecture Hall No. 8, 12:00 o'clock
Prof. Scott Aaronson, MIT
Twenty years after the discovery of Shor's factoring algorithm, I'll survey what we now understand about
the structure of problems that admit quantum speedups. I'll start with the basics, discussing the hidden
subgroup, amplitude amplification, adiabatic, and linear systems paradigms for quantum algorithms.
Then I'll move on to some general results, obtained by Andris Ambainis and myself over the last few years,
about quantum speedups in the blackbox model. These results include the impossibility of a superpolynomial
quantum speedup for any problem with permutation symmetry, and the largest possible separation between classical
and quantum query complexities for any problem.
QISC members visit ETH Zurich
Monday, November 17th 2014, ETH Zurich
ETH Zurich Quantum Science and Technology community
Several members of QISC visited ETH Zurich, and held an exciting twoday workshop discussing possible collaboration.
In the photo (from left to right): Nadav Katz, Guy Ron, Ronen Rapaport, Nir BarGill, Hadar Steinberg, Michael BenOr, Andreas Wallraff and Jerome Faist.
Click here for the program of the workshop
Single engineered donor atoms with nuclear and electron spin readout for quantum bits in silicon
Thursday, August 13th 2014, Danciger B seminar room 11:00 o'clock
Prof. David N. Jamieson, Centre for Quantum Computation and Communication Technology, School of Physics, University of Melbourne
Solid state transistors triggered a revolution in the way we store, compute and communicate information.
Half a century after this revolution began a new type of processing has emerged based on quantum instead
of classical physics. Solid state devices based on diamond, silicon and other semiconductor systems have
been proposed with spinbased quantum bits to form the backbone of the quantum processor, but to date a
viable largescale architecture remains to be demonstrated. We have used ion implantation to insert
phosphorus atoms into silicon to explore quantum computer technology based on potentially scalable
engineered single donor atom devices. It is now possible to fabricate nanoscale silicon transistors with
a channel length (~20 nm) that is comparable in size to the Bohr orbit of the donor electrons (~1.22 nm for Si:P).
Our approach is to engineer nanoscale silicon CMOS devices with a single 31P atom implanted with our deterministic
doping method [1] that is cited by the International Semiconductor Roadmap for 2011 [2]. Our devices have now
proved the ability to perform single shot readout of the donor electron spin [3].
We use electron spin resonance to drive Rabi oscillations to show a coherence time (T2) exceeding 200 µs suggesting
a single P donor electron spin can be used as a longlived quantum bit [4]. The same devices show P nuclear spin
coherence times for ionized donors of 60 ms [5]. New devices built from enriched 28Si, described as a "semiconductor
vacuum" because of the absence of decohering background spins, offer even longer coherence times. This presentation
describes our approach to take this technology to the next stage by building deterministic arrays of single atoms.
We seek to exploit the remarkable coincidence that the range over which it is possible to couple electrons in the
solid state is comparable to the straggling range of shallow donor atoms implanted <20 nm deep into a semiconductor wafer.
This presentation reviews the challenges of building a large scale quantum device for computation and communication
that may ul timately lead to the quantum internet of the mid21st C.
[1] DN Jamieson, C Yang, T Hopf, SM Hearne, CI Pakes, S Prawer, M Mitic, E Gauja, SES Andresen, FE Hudson, AS Dzurak & RG Clark, Controlled shallow singleion implantation in silicon using an active substrate for sub20keV ions, Appl. Phys. Lett. 86, p202101 13 (2005)
[2] International Technology Roadmap for Semiconductors, Emerging Research Materials
www.itrs.net/Links/2011ITRS/2011Chapters/2011ERM.pdf
[3] JJ Pla, FA Zwanenburg, KW Chan, H Huebl, M Möttönen, CD Nugroho, C Yang, JA van Donkelaar, A Alves, DN Jamieson, CC Escott, LCL Hollenberg, RG Clark & AS Dzurak, Singleshot readout of an electron spin in silicon, Nature 467 687 (2010)
[4] JJ Pla, KY Tan, JP Dehollain, WH Lim, JJL Morton, DN Jamieson, AS Dzurak & A Morello, A singleatom electron spin qubit in silicon, Nature 489 541 (2012)
[5] JJ Pla, KY Tan, JP Dehollain, WH Lim, JJL Morton, FA Zwanenburg, DN Jamieson, AS Dzurak, A Morello, A highfidelity single nuclear spin qubit in silicon, Nature 496 334 (2013)
This research was conducted by the Australian Research Council Centre of Excellence for Quantum Computation and
Communication Technology (project number CE110001027 and the US Army Research Office (grant number W911NF0810527).
We acknowledge the collaborations of Changyi Yang, Andrew Alves, Jeff McCallum (University of Melbourne), Andrew Dzurak,
Andrea Morello, Fay Hudson (UNSW) and Thomas Schenkel (LBNL).
Quantum Optics with Propagating Microwave Photons
Tuesday, June 6th 2014, Danciger B seminar room 12:00 o'clock
Prof. Andreas Wallraff , ETH Zurich
Using modern micro and nanofabrication techniques combined with superconducting materials we
realize quantum electronic circuits in which we create, store, and manipulate individual
microwave photons. The strong interaction of photons with superconducting quantum twolevel
systems allows us to probe fundamental quantum effects of microwave radiation and also to
develop components for applications in quantum technology. Previously we have realized
ondemand single photon sources which we have characterized using correlation function
measurements [1] and full quantum state tomography [2].
For this purpose we have developed efficient methods to separate the quantum signals of interest
from the noise added by the linear amplifiers used for quadrature amplitude detection [3]
We now regularly employ superconducting parametric amplifiers [4] to perform nearly quantum
limited detection of propagating electromagnetic fields. These enable us to probe the entanglement
which we generate on demand between stationary qubits and microwave photons freely propagating
down a transmission line [5]. Using two independent microwave single photon sources, we have
recently performed HongOuMandel experiments at microwave frequencies [6] and have probed
the coherence of twomode multiphoton states at the output of a beamsplitter.
The nonlocal nature of such states may prove to be useful for distributing entanglement in future smallscale quantum networks.
[1] D. Bozyigit et al., Nat. Phys. 7, 154 (2011)
[2] C. Eichler et al., Phys. Rev. Lett. 106, 220503 (2011)
[3] C. Eichler et al., Phys. Rev. A 86, 032106 (2012)
[4] C. Eichler et al., Phys. Rev. Lett. 107, 113601 (2011)
[5] C. Eichler et al., Phys. Rev. Lett. 109, 240501 (2012)
[6] C. Lang et al., Nat. Phys. 9, 345–348 (2013)
Assessing claims of quantum annealing: Does DWave have a quantum computer?
Wednesday, April 9th 2014, Danciger B Seminar room 14:00 o'clock
Prof. John Smolin, IBM, Thomas J. Watson Research Center
Recently there has been intense interest in claims about the
performance of the DWave machine. Scientifically the most interesting
aspect was the claim based on extensive experiments,
that the machine exhibits largescale quantum behavior. This
conclusion was based on the strong correlation of the inputoutput
behavior of the DWave machine with a quantum model called simulated
quantum annealing, in contrast to its poor correlation with two
classical models: simulated annealing and classical spin dynamics. In
this paper, we outline a simple new classical model, and show that on
the same data it yields correlations with the DWave inputoutput
behavior that are at least as good as those of simulated quantum
annealing. Based on these results, we conclude that classical models
for the DWave machine are not ruled out. Further analysis of the new
model provides additional algorithmic insights into the nature of the
problems being solved by the DWave machine.
Quantum Measurement Distinguished Lectures Symposium
Sunday, March 30th 2014, Danciger B seminar room, 12:0014:30 o'clock
Prof. Ferdinand SchmidtKaler, University of Mainz, Germany
Ion crystals for quantum computing, simulation and nonequilibrium physics?
Ion crystals are among the most controlled quantum systems. The crystal structure is controlled with
high precision using the dynamic and the static Paul potentials. As an alternative to quantum computation
which small linear crystals, shuttled in micro trap arrays, as pioneered by Wineland
[Science 325, 1227 (2009), PRL109, 080501 (2012)] we aim for planar crystal structures,
and investigate this structural transition [PRL 109, 263003 (2012)] also under nonequilibrium conditions
[Nat. Comm. 4, 2290 (2013)]. Interactions for quantum magnetic simulations are mediated using laser interactions.
Statedependent forces are generated with nonresonant Raman beams [NJP 14, 093042 (2012), PRL 107, 207209 (2011),
PRL 108, 235701 (2012)]. A novel approach is the use of specific properties of Rydberg excitations for trapped ion
crystals, we prepare a cold 40Ca+ ion crystal, excite the S1/2  D5/2 transition near 729nm and apply radiation near
123nm for Rydberg excitation. We report the investigation of mixed crystals of single and doubly ionized Ca, for mode
design and structural configuration [arxiv 1306.1109] along the proposals [PRL 108, 023003 (2012), PRA 87, 052304 (2013)].
Lunch break
Prof. Beatrix Heismayer, University of Vienna, Austria
What has Bell's theorem to do with the absence of antimatter in our universe?
John Stewart Bell was known and hired as a "particle physicist" when he came up with his work on hidden
parameters exactly 50 years ago. The aim of this talk is to discuss whether his theorem can be brought
back to those systems that do not build up ordinary matter and light, i.e. to the domain of Particle Physics.
Indeed, massive Kmeson pairs are copiously produced at accelerator facilities that are entangled in their strangeness
quantum number, i.e. being in the particle or antiparticle state. Entanglement and its manifestations reveal differently
than in quantum systems of low energy [1]. In particular, it turned out that there exists a connection between the
violation of Bell's inequality and the tiny violation of the CP symmetry (C...charge conjugation, P...parity). The
broken CP symmetry, verified in various accelerator facility experiments, shows a small difference between a world
of matter and a world of antimatter. This relates two different powerful toolboxes in physics, entanglement and
symmetries in Particle Physics. Moreover, the discovery of CP violation, also exactly 50 years old, can be attributed
to the unsolved problem why we live in a universe dominated by matter, i.e. why has antimatter disappeared?
In the last part of the talk I show that these mesonantimeson systems are a unique laboratory to study foundations
of quantum mechanics, e.g., for testing different kinds of quantum eraser schemes or decoherence models or collapse models [2].
[1] Hiesmayr et al., "/Revealing Bell's Nonlocality for Unstable Systems in High Energy Physics/", EPJ C, Vol. 72, 1856 (2012).
[2] Brahami et al., "/Are collapse models testable with quantum oscillating systems? The case of neutrinos, mesons, chiral molecules/", Nature: Scientific Reports 3, 1952 (2013).
Distinguished Lecturer Series
Sunday, March 23rd 2014, Danciger B seminar room, 12:0014:30 o'clock
Prof. Klaus Molmer, Aarhus University, Denmark
How do we optimally extract precision information from continuous measurement records?
Quantum systems find use as precision probes, as well as time and frequency standards,
and much research has dealt with the sensitivity of measurement schemes based on the preparation, evolution and final detection of
different, particular quantum states. In this talk, I shall discuss another
common scheme for precision probing, where a fluctuating signal is
retrieved continuously in time, while the quantum system that emits the
signal follows a stochastic evolution, sometimes referred to as a quantum
trajectory. I shall show how the stochastic master equation describing the
dynamics of such a quantum system effectively "filters" the likelihood
functions for any unknown parameters in the system dynamics. I shall also
show that the theoretical sensitivity limit for parameters that govern the
system dynamics can be obtained from the (unobserved) system master
equation. With detection of atomic fluorescence signals as an example, I
shall demonstrate that photon counting and homodyne detection of the signal
yield different sensitivity to the atomic and field parameters, while none
of them exceed the general sensitivity limit.
Lunch break
Prof. Martin Plenio, University of Ulm, Germany
Measuring Entanglement and Quantum States Efficiently
One of the principal features distinguishing classical from quantum manybody systems is that
quantum systems require exponentially many parameters in the system size to fully specify the state,
compared to only linearly many for classical systems. Put to use constructively, the exponential
complexity enables the construction of information processing devices fundamentally superior to
any classical device. At the same time, however, this "curse of dimensionality" makes engineering
tasks such as verifying that the quantum processing device functions as intended  a daunting challenge.
Here I show that one can do exponentially better than direct state tomography for a wide range of quantum
states, in particular those that are well approximated by a matrix product state ansatz. Furthermore, I
demonstrate that the extraction of complex functions of the quantum state, such as entanglement can be
achieved very efficiently if one sacrifices the desire to know exact value instead being satisfied with
very good upper and lower bounds. I will present both theoretical methods and the results of experiments
in which these methods have been applied.
From the Heisenberg Uncertainty Principle to the Theory of Majorization
Sunday, December 22nd 2013, Danciger B Seminar room 12:00 o'clock
Prof. Gilad Gour, Calgary University
Uncertainty relations are a distinctive characteristic of quantum theory that imposes intrinsic
limitations on the precision with which physical properties can be simultaneously determined.
The modern work on uncertainty relations employs entropic measures to quantify the lack of knowledge
associated with measuring noncommuting observables. However, I will show here that there is no
fundamental reason for using entropies as quantifiers; in fact, any functional relation that characterizes
the uncertainty of the measurement outcomes can be used to define an uncertainty relation. Starting from
a simple assumption that any measure of uncertainty is nondecreasing under mere relabeling of the measurement
outcomes, I will show that Schurconcave functions are the most general uncertainty quantifiers. I will then
introduce a novel finegrained uncertainty relation written in terms of a majorization relation, which
generates an infinite family of distinct scalar uncertainty relations via the application of arbitrary measures
of uncertainty. This infinite family of uncertainty relations includes all the known entropic uncertainty relations,
but is not limited to them. In this sense, the relation is universally valid and captures the essence of the uncertainty
principle in quantum theory. This talk is based on a joint work with Shmuel Friedland and Vlad Gheorghiu.
Qstart
Monday, June 24th 2013
Organizers: Nadav Katz (Chair), Dorit Aharonov, Hagai Eisenberg, Gil Kalai (HUJI)
The Hebrew University of Jerusalem Quantum Information Center is proud to announce
its very first conference which will be held on the 24
^{th} to the 27
^{th}
of June 2013.
This event has in store a promising entourage of highly distinguished lecturers
from all around the world, offering much insight into quantum information related theories and
practice, revealed through their innovative works.
For further information, details and registration please follow
this link to visit the official pages of the conference.
Wolf Prize Symposium Lectures
Monday, May 6th 2013, Levin lecture hall no.8 10:00 o'clock
Prof. Ignacio Cirac, MaxPlanck Institute for QuantumOptics, Garching, Germany
Quantum memories: design and applications
10:0011:00
Quantum memories are devices where one can store and retrieve quantum states. In order to preserve the
states in the presence of decoherence, one may use quantum error correction techniques. An alternative
approach consists of employing interacting spins so that no active action on the memory is require
during the whole storage period. In this talk I will analyze the robustness of such memories against
decoherence, as well as those based on dissipation, whereby an interaction of the spins with an environment
is properly engineered. I will also analyze the security of protocols using quantum memories, like those
related to quantum money and credit cards, as well as some experimental attempts to extend the memory
time of qubits at room temperature.
Peter Zoller, Institute for Theoretical Physics, University of Innsbruck, Austria
Quantum Information Processing with Quantum Optical Systems
11:1512:15
Quantum optical systems of cold atoms, molecules and ions provide one of the best ways to implement
quantum information processing tasks, including quantum computing, quantum simulation and quantum
communication. The talk starts with a short overview of quantum optical systems with focus on ions
and cold atoms. We then discuss our recent work on "open system" quantum simulation and entangled
states preparation via quantum reservoir engineering, and discuss related ion experiments.
In addition, we give a summary of our present activities in simulating toy models of lattice gauge
theories with cold atoms.
Superoscillations and Weak Measurement
Thursday, April 25th 2013, Danciger B bld. seminar room 9:00 o'clock
Prof. Michael Berry
Bandlimited functions can oscillate arbitrarily faster than their fastest Fourier component over
arbitrarily long intervals. Where such "superoscillations" occur, functions are exponentially weak.
In typical monochromatic optical fields, substantial fractions of the domain (onethird in two
dimensions) are superoscillatory. Superoscillations have implications for signal processing,
and raise the possibility of subwavelength resolution microscopy without evanescent waves.
In quantum mechanics, superoscillations correspond to weak measurements, suggesting weak values of
observables (e.g photon momenta) far outside the range represented in the quantum state. A weak
measurement of neutrino speed could lead to a superluminal result without violating causality,
but the effect is too small to explain the speed claimed in a recent experiment.
The Coffee Automaton: Quantifying the Rise and Fall of Complexity in Closed Systems
Wednesday, July 18th 2012, Ross bld. room 201 14:00 o'clock
Prof. Scott Aaronson, MIT
In contrast to entropy, which increases monotonically, the
"complexity" or "interestingness" of closed systems seems intuitively
to increase and then decrease: for example, our universe lacked
complex structures at the Big Bang and will also lack them after it
reaches thermal equilibrium. I'll discuss an initial attempt to
quantify this pattern. As a model system, we use a simple,
twodimensional cellular automaton that simulates the mixing of two
liquids ("coffee" and "cream"). A plausible complexity measure is
then the Kolmogorov complexity of a coarsegrained approximation of
the automaton's state. We study this complexity measure, and show
analytically that it never becomes large when the liquid particles are
noninteracting. By contrast, when the particles do interact, we give
numerical evidence that the complexity reaches as a maximum comparable
to the "coffee cup's" horizontal dimension. We raise the problem to
prove this behavior analytically.
Joint work with Lauren Ouellette and Sean Carroll.
Quantum Information Kickoff Workshop
Wednesday, May 30th 2012, Belgium bld. 9:00 o'clock
Organizer: Dr. Nadav Katz
Local additivity of the minimum entropy output of a quantum channel
Tuesday, December 27th 2011, Kaplun bld. seminar room, 15:00 o'clock
Presenter: Mr. Gilad Gur
One of the major open problems in quantum information concerns with the question whether entanglement between signal
states can help to send classical information on quantum channels. Recently, Hasting proved that entanglement does
help by finding a counterexample for the long standing additivity conjecture that the minimum vonNeumann entropy
output of a quantum channel is additive under taking tensor products. In this talk I will show that the minimum
vonNeumann entropy output of a quantum channel is locally additive. Hasting's counterexample for the global additivity
conjecture, makes this result somewhat surprising. In particular, it indicates that the nonadditivity of the minimum
entropy output is related to a global effect of quantum channels. I will end with few related open problems.