Dear QSIT members
Our first QSIT Lunch Seminar within the framework of the NCCR will
take place on Thursday February 3rd, at 12:00 noon in the room HPF G6,
ETH Hönggerberg, Zurich. There will be two talks of 30 minutes
duration jointly presented by two collaborators from different
research groups. At 13:00 pm free pizza is offered to the participants.
Strong coupling regime in parabolic semiconductor quantum wells
Markus Geiser, Quantum Optoelectronics Group, ETH Zurich
and
…
[View More]Dynamical resurrection of the visibility in a Mach-Zehnder
interferometer
Andrey Lebedev, Institut for Theoretical Physics, ETH Zurich
Abstracts: http://www.nccr-qsit.ethz.ch/news/lunchseminar/february2011
Please register for your free pizza at the following link by Tuesday
February 1, 12:00 noon:
http://doodle.ethz.ch/r8f7tq7gczkyb4dr
If you have suggestions on topics or speakers, or would like to
present recent results of your research, please send your information
to Andreas Wallraff or Ilona Blatter.
With best regards,
Andreas Wallraff Ilona Blatter
Professor for Solid State Physics QSIT Coordinator
---------------------------------------------------
ETH Zurich
Dr. Ilona Blatter
QSIT Coordinator
Laboratory for Solid State Physics
HPF E 17
Schafmattstrasse 16
8093 Zurich
ilona.blatter(a)phys.ethz.ch
www.qsit.ethz.chwww.nccr-qsit.ethz.ch
Phone: +41 44 633 36 06
Home: +41 44 844 42 50
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Hi,
There will be a seminar talk by Andre Ranchin tomorrow, Feb. 1, 17:00
in HIT K 51. The title is "On multipartite entanglement: concentration,
reversibility and measures of entanglement"
Cheers, Stefan
Hi,
Volkher Scholz from Hannover will be in Zurich and give a seminar talk
on Wed., Feb. 9., 16:30 - 17:30, in HIT K 51.
Best regards,
Stefan
__________________________________________________________________________
Disordered Quantum Walks in one lattice dimension -
Andre Ahlbrecht, *Volkher B. Scholz*, Albert H. Werner - arXiv:1101.2298
We study a spin-$\frac{1}{2}$-particle moving on a one dimensional lattice
subject to disorder induced by a random, space-dependent quantum coin.
The …
[View More]discrete time evolution is given by a family of random unitary quantum
walk operators, where the shift operation is assumed to be deterministic.
Each coin is an independent identically distributed random variable with
values in the group of two dimensional unitary matrices. We derive
sufficient
conditions on the probability distribution of the coins such that the
system
exhibits dynamical localization. Put differently, the tunneling probability
between two lattice sites decays rapidly for almost all choices of random
coins and after arbitrary many time steps with increasing distance. Our
findings imply that this effect takes place if the coin is chosen at random
from the Haar measure, or some measure continuous with respect to it,
but also for a class of discrete probability measures which support
consists
of two coins, one of them being the Hadamard coin.
__________________________________________________________________________
[View Less]
Dear QSIT members
Our first QSIT Lunch Seminar within the frame of the NCCR will take
place on Thursday February 3rd, at 12:00 noon in the room HPF G6, ETH
Hönggerberg, Zurich. There will be two talks of 30 minutes duration
jointly presented by two collaborators from different research
groups. At 13:00 pm free pizza is offered to the participants.
Strong coupling regime in parabolic semiconductor quantum wells
Markus Geiser, Quantum Optoelectronics Group, ETH Zurich
and
Dynamical …
[View More]resurrection of the visibility in a Mach-Zehnder
interferometer
Andrey Lebedev, Institut for Theoretical Physics, ETH Zurich
Abstracts: http://www.nccr-qsit.ethz.ch/news/lunchseminar/february2011
Please register for your free pizza at the following link by Tuesday
February 1, 12:00 noon:
http://doodle.ethz.ch/r8f7tq7gczkyb4dr
If you have suggestions on topics or speakers, or would like to
present recent results of your research, please send your information
to Andreas Wallraff or Ilona Blatter.
With best regards,
Andreas Wallraff Ilona Blatter
Professor for Solid State Physics QSIT Coordinator
---------------------------------------------------
ETH Zurich
Dr. Ilona Blatter
QSIT Coordinator
Laboratory for Solid State Physics
HPF E 17
Schafmattstrasse 16
8093 Zurich
ilona.blatter(a)phys.ethz.ch
www.qsit.ethz.chwww.nccr-qsit.ethz.ch
Phone: +41 44 633 36 06
Home: +41 44 844 42 50
[View Less]
---------- Message transféré ----------
De : *David Poulin* <David.Poulin(a)usherbrooke.ca
<mailto:David.Poulin@usherbrooke.ca>>
Date : 27 janvier 2011 10:30
Objet : Canadian Summer School on Quantum information & Student Conference
À :
Dear colleague,
(with apologies if you receive this message multiple times)
Registration for the 11th Canadian Summer School on Quantum Information
and the 8th Canadian Student Conference on Quantum Information is now
open. Please advertise …
[View More]these events to any colleagues, students and
postdocs who might be interested.
Best wishes,
David
*
*
*Registration now open:*
*11th Canadian Summer School on Quantum Information (June 6th-15th)*
*8th Canadian Student Conference on Quantum Information (June 16th-17th)*
*Jouvence, Québec, Canada*
The 11th edition of the Canadian Summer School on Quantum Information
and the 8th Canadian Student Conference on Quantum Information will be
held from June 6th to 17th 2011 at the Centre de Villegiature de
Jouvence, located in a Quebec National Park. Once again this year, many
of the world's leading experts on quantum information will present
series of lectures targeted at prospective and current graduate
students, as well as postdocs, in the areas of physics, mathematics,
computer science and engineering. The Student Conference is a unique
occasion for students to present their work and exchange with their
fellow students. More information about these events can be found at the
web page
http://www.crm.umontreal.ca/QI11/index_e.php
Registration is now open. Early registration ends March 11th, 2011.
*Places are limited, first come first served. Hurry up!*
Deadline to submit a contribution to the Student Conference: April 20th
Looking forward to see you in Jouvence.
Organizers:
David Poulin (Main organizer)
Alexandre Blais
Michel Pioro-Ladrière
Bertrand Reulet
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Dear all,
Will Matthews will be visiting us next week (2.-4th Feb) and will give a talk on Wednesday.
Time and Location: Wednesday, 2 February 2011, noon, HIT K 51
Speaker: William Matthews (IQC Waterloo)
Title: Entanglement can increase asymptotic rates of zero-error classical communication over classical channels
Abstract: It is known that the number of different classical messages which can be communicated with a single use of a classical channel with zero probability of …
[View More]decoding error can sometimes be increased by using entanglement shared between sender and receiver. It has been an open question to determine whether entanglement can ever increase the zero-error communication rates achievable in the limit of many channel uses. In this paper we show, by explicit examples, that entanglement can indeed increase asymptotic zero-error capacity, even to the extent that it is equal to the normal capacity of the channel. Interestingly, our examples are based on the exceptional simple root systems E7 and E8. See http://arxiv.org/abs/1009.1195
See you, Matthias.
Save the date:
QCRYPT 2011 - First Annual Conference on Quantum Cryptography
September 12-16, 2011
ETH Zurich
www.qcrypt.net
Matthias Christandl
Institute for Theoretical Physics
ETH Zurich
http://www.itp.phys.ethz.ch/people/christandl/index
[View Less]
Good afternoon,
There will be a seminar talk by our visitor Jochen Rau
in February:
Tuesday, Feb. 8, 17:00 in HIT K 52 on Hoenggerberg.
Best regards,
Stefan
_______________________________________________________________
TITLE
Bayesian methods in quantum-state tomography
ABSTRACT
Conventional tomography protocols reach their limits when sample sizes
become very small, or when there is no consensus about the parametric form
of the state to be inferred. Protocols must then be modified to …
[View More]account
explicitly for a prior bias, and be supplemented by methods that allow one
to infer the most plausible parametric form from the data. The necessary
tools are furnished by Bayesian statistics: Bayesian interpolation, the
evidence procedure, and Bayesian model selection.
_______________________________________________________________
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Dear all
Please be informed about the following QSIT Seminar.
With best regards,
Ilona Blatter
--------------------------------------------
Monday January 17, 2011
Time: 14:00
Place: HPF G 6
Host: Atac Imamoglu
Quantum entanglement between an optical photon and a solid-state spin
qubit
Emre Togan
Harvard University, USA
Quantum entanglement is among the most fascinating aspects of quantum
theory. In this work, I will report on the realization of quantum
entanglement between a …
[View More]solid-state spin qubit and the polarization of
a single optical photon. The experimental entanglement verification
demonstrates a high degree of control over the interactions between
the quantum light field and the electronic spin of the nitrogen
vacancy center in diamond. The entanglement source provides a key
building block for the solid-state realization of quantum optical
networks and may be used in studies of fundamental physical phenomena.
---------------------------------------------------
ETH Zurich
Dr. Ilona Blatter
QSIT Coordinator
Laboratory for Solid State Physics
HPF E 13
Schafmattstrasse 16
8093 Zurich
ilona.blatter(a)phys.ethz.ch
www.qsit.ethz.chwww.nccr-qsit.ethz.ch
Phone: +41 44 633 36 06
Home: +41 44 844 42 50
[View Less]
Hi,
The talk as announced before will take place one week later, on ** Jan.
25 **.
Everything else remains unchanged.
Please apologize for the spamming.
Cheers,
Stefan
-------- Original-Nachricht --------
Betreff: Talk by Corsin Pfister
Datum: Tue, 4 Jan 2011 14:36:59 +0100
Von: Stefan Wolf <wolf(a)inf.ethz.ch>
An: <itp-quantumseminare(a)phys.ethz.ch>, Corsin Pfister
<pfisterc(a)student.ethz.ch>
Good afternoon,
First of all, happy new year to all of you, I …
[View More]wish you joy and
luck and success!
This year's first seminar talk will be given by Corsin Pfister:
Tuesday, Jan. 18, 17:00 in HIT J 52 (or maybe one of the K rooms,
if available) on Hoenggerberg.
Best regards,
Stefan
_______________________________________________________________
Title:
Tsirelson's bound in time
Abstract:
The mathematical descriptions of joint probability distributions of measure-
ment outcomes occurring in quantum mechanics are very different. Two local
measurements on different subsystems are described by observables of tensor
product form on a common tensor Hilbert space (two-systems correlations).
Two measurements on the same system with an intermediate dynamical evolu-
tion are described by a state update rule, trace-preserving completely
positive
maps and observables without a tensor product form (two-times correlations).
Two-systems correlations are restricted by Tsirelson’s bound. One might
ask if
Tsirelson’s bound can also be used to find restrictions on two-times
correlations.
This thesis partially answers this question. Tsirelson’s bound is combined
with an extended version of the Choi-Jamiolkowski Isomorphism, the Leifer
Isomorphism, which shows an equivalence between two-systems and two-times
correlations. It is shown that Tsirelson’s bound, together with the
Leifer Iso-
morphism, implies a tight bound on the average success probability of a
special
type of (2, 1,p)-Random Access Codings (RACs). RACs can be realised using
two-systems correlations as well as two-times correlations, which allows
a com-
parison of the two cases. An attempt to interpret the analogue of the
locality
condition in the case of two-times correlations is made. It is found
that two-
times correlations used to realise this special type of (2, 1,p)-RAC
cannot be
used to communicate, as is the case for two-systems correlations.
_______________________________________________________________
[View Less]
Good afternoon,
First of all, happy new year to all of you, I wish you joy and
luck and success!
This year's first seminar talk will be given by Corsin Pfister:
Tuesday, Jan. 18, 17:00 in HIT J 52 (or maybe one of the K rooms,
if available) on Hoenggerberg.
Best regards,
Stefan
_______________________________________________________________
Title:
Tsirelson's bound in time
Abstract:
The mathematical descriptions of joint probability distributions of measure-
ment outcomes occurring in …
[View More]quantum mechanics are very different. Two local
measurements on different subsystems are described by observables of tensor
product form on a common tensor Hilbert space (two-systems correlations).
Two measurements on the same system with an intermediate dynamical evolu-
tion are described by a state update rule, trace-preserving completely
positive
maps and observables without a tensor product form (two-times correlations).
Two-systems correlations are restricted by Tsirelson’s bound. One might
ask if
Tsirelson’s bound can also be used to find restrictions on two-times
correlations.
This thesis partially answers this question. Tsirelson’s bound is combined
with an extended version of the Choi-Jamiolkowski Isomorphism, the Leifer
Isomorphism, which shows an equivalence between two-systems and two-times
correlations. It is shown that Tsirelson’s bound, together with the
Leifer Iso-
morphism, implies a tight bound on the average success probability of a
special
type of (2, 1,p)-Random Access Codings (RACs). RACs can be realised using
two-systems correlations as well as two-times correlations, which allows
a com-
parison of the two cases. An attempt to interpret the analogue of the
locality
condition in the case of two-times correlations is made. It is found
that two-
times correlations used to realise this special type of (2, 1,p)-RAC
cannot be
used to communicate, as is the case for two-systems correlations.
_______________________________________________________________
[View Less]