Good evening,
Next week's seminar talk will be given by Wolfgang Tittel:
Tuesday, Dec. 7, 16.45, in HIT E 41.1 on Hoenggerberg.
(Please note the exceptional location and time.)
Best regards,
Stefan
______________________________________________________________________
Title:
Broadband waveguide quantum memory for entangled photons
Abstract:
The reversible transfer of quantum states of light in and out of matter
constitutes an important building
block for future applications of quantum …
[View More]communication: it allows
synchronizing quantum information,
and enables one to build quantum repeaters and quantum networks. Much
effort has been devoted
worldwide over the past years to develop memories suitable for the
storage of quantum states.
Of central importance to this task is the preservation of entanglement,
a quantum mechanical
phenomenon whose counter-intuitive properties have occupied
philosophers, physicists and computer s
cientists since the early days of quantum physics. Here we report, for
the first time, the reversible
transfer of photon-photon entanglement into entanglement between a
photon and collective atomic
excitation in a solid-state device. Towards this end, we employ a
thulium-doped lithium niobate
waveguide in conjunction with a photon-echo quantum memory protocol, and
increase the spectral
acceptance from the current maximum of 100 MHz to 5 GHz. The
entanglement-preserving nature
of our storage device is assessed by comparing Bell inequality
violations as well as the amount of
entanglement contained in the detected photon pairs before and after the
reversible transfer, showing,
within statistical error, a perfect mapping process. Our integrated,
broadband quantum memory
complements the family of robust, integrated lithium niobate devices. It
renders frequency matching
of light with matter interfaces in advanced applications of quantum
communication simple and
constitutes an important milestone on the path towards fully
quantum-enabled networks.
Short Bio:
Wolfgang Tittel studied Physics at the University of Frankfurt in
Germany, was a Ph.D. student at the
University of Geneva in Switzerland with Nicolas Gisin, and did post
doctoral work at the University of
Aarhus / Denmark and again in Geneva. He joined the Department of
Physics and Astronomy and the
Institute for Quantum Information Science at the University of Calgary
as Associate Professor and
NSERC/GDC/iCORE Industrial Research Chair in July 2006.
Dr. Tittel engaged in ground-breaking experiments in the field of
quantum communication from the early
stages on. The investigations were seminal in bringing quantum
cryptography out of the laboratory and
into the real world using a standard telecommunication fibre network,
thereby raising both scientific and
public awareness and appreciation that quantum technology is not
restricted to contrived laboratory settings.
His current interests include practical quantum cryptography, quantum
relays, and quantum memory.
______________________________________________________________________
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Dear QSIT members
The next QSIT Lunch Seminar will take place on Thursday December 2,
2010, at 12:00 noon in the room HPF G6, ETH Hönggerberg. At 13:00 pm
free pizza is offered to the participants. There will be two talks of
30 minutes duration jointly presented by two collaborators from
different research groups:
A coupled quantum dot laser amplifier
Kathrina Weiss, Quantum Photonics Group, ETH-Zurich
and
Experimental Tomographic State Reconstruction of Itinerant Microwave
…
[View More]Photons
Christopher Eichler, Quantum Device Lab, ETH Zurich
Abstracts: http://www.qsit.ethz.ch/news/lunch/December_10
Please register for your free pizza at the following link by Tuesday
November 30, 12:00 noon:
http://doodle.ethz.ch/fkekfrygi7rhpbtv
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 13
Schafmattstrasse 16
8093 Zurich
ilona.blatter(a)phys.ethz.ch
www.qsit.ethz.ch
Phone: +41 44 633 36 06
Home: +41 44 844 42 50
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Dear all
Please be informed about the following QSIT Seminar.
With best regards,
Ilona Blatter
------------------------------------------------------------------------------------------------------
Date: Monday November 29, 2010
Time: 11:00
Place: HPF G 6
Host: Atac Imamoglu
Probing spins and ripples in graphene with an in-plane magnetic field
Mark Lundeberg
University of British Columbia, Vancouver, Canada
Since the early days of the graphene boom, perpendicular magnetic
fields have …
[View More]been used to to reveal graphene's unusual properties
through the quantum Hall effect. This effect occurs due to the strong
coupling of magnetic fields to the electrons charge, which easily
overwhelms the coupling to their spins. The charge coupling can be
turned off, however, by rotating the magnetic field to be parallel to
the two-dimensional graphene sheet. By applying such in-plane magnetic
fields, we were able to directly observe spin splitting of the
electron sea in graphene. In practice, a small amount of charge
coupling does remain since graphene devices have a naturally rippled
topography when placed on a rough substrate. This results in
experimentally observable random magnetic field effects when a uniform
in-plane field is applied, allowing the ripple size to be estimated.
------------------------------------------------------------------------------------------------------
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
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Hi,
Next week's seminar talk is by David Gross. It will take place on
Tuesday, 30.11., 17:00, at CAB H 52 in Zentrum.
Best regards,
Stefan
____________________________________________________________
Title:
In a discrete universe, no acceleration
Abstract:
I will present an analysis of the time evolutions that can be realized
in one-dimensional quantum systems with discrete space and discrete
time. We assume causality, in the sense that in any time step,
information can propagate only …
[View More]a finite distance. In this setting, we
find that there is a single, simple invariant - called the "index" for
lack of a better name - which completely solves the following three
problems:
1. Classify all time evolutions up to continuous deformations
2. Classify those dynamics which can be realized by sequential localized
unitaries
3. Classify the pairs of time evolutions U_1, U_2 which can be "pieced
together" in the sense that there exists a single large system U which
behaves like U_1 in some parts an like U_2 in other parts.
I will also not fail to mention what my title has to do with any of that.
arxiv:0910.3675 (to appear in CMP).
____________________________________________________________
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Anfang der weitergeleiteten E-Mail:
> Von: "Gaby Strahm" <strahm(a)phys.ethz.ch>
> Datum: 24. November 2010 09:20:57 GMT+01:00
> An: "FKP alle" <fkp-alle(a)phys.ethz.ch>
> Betreff: FKP Seminar Prof. Belzig, Uni Konstanz
>
> Dear All,
>
> You are cordially invited for the next Solid State Physics Seminar:
>
> 25. Nov. 2010, 16:45h, HPF G 6
>
>
> Speaker:
> Prof. Wolfgang Belzig, Theoretische Festkörperphysik, Universität
> Konstanz
>
…
[View More]> Title
> "Quantum paradoxes in electronic full counting statistics"
>
> Abstract:
> The impossibility of measuring non-commuting quantum mechanical
> observables is one of the most fascinating consequences of the
> quantum mechanical postulates. Hence, to date the investigation of
> quantum measurement and projection is a fundamentally interesting
> topic. We propose to test the concept of weak measurement of non-
> commuting observables in mesoscopic transport experiments, using a
> quasiprobablistic description. As first example of a paradox, we
> derive an inequality for current correlators, which is satisfied by
> every classical probability but violated by high-frequency fourth-
> order cumulants in the quantum regime for experimentally feasible
> parameters. Further paradoxes can be used to detect nonlocal quantum
> correlations (entanglement) in mesoscopic junctions far beyond the
> regime covered by the usual Bell inequalities.
>
> (Host: A. Wallraff)
>
> Kind regards
>
> Gaby Strahm
> ETH Zürich
> Solid State Physics Laboratory
> HPF F 7
> Schafmattstrasse 16
> CH-8093 Zürich
> Phone: ++41/ 044 633 23 35
> Fax. ++41/ 044 633 10 72
>
> Bitte denken Sie an die Umwelt. Müssen Sie diese Nachricht drucken?
> Be environment friendly, only print this email if absolutely necessary
---------------------------------------------------
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
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Dear all
Please be informed about two talks scheduled on Monday November 22,
a QSIT Seminar and a Theoretical Physics Colloquium.
With best regards,
Ilona Blatter
------------------------------------------------------------------------------------------------------
Date: Mon November 22, 2010
Time: 11:00
Place: HPF G 6
Host: Atac Imamoglu
Many-Body Open System Dynamics with Cold Atoms and Ions
Sebastian Diehl and Markus Müller
University of Innsbruck, Austria
QSIT Seminar
more at: http://…
[View More]www.qsit.ethz.ch/news/talks/abstractDiehlMueller
--- and
--------------------------------------------------------------------------------------------
Date: Mon November 22, 2010
Time: 16:45
Place: UZH Irchel, Y 16 G 05
Entangled?
Matthias Christandl
ETH Zurich
Theoretical Physics Colloquium
more at: http://www.itp.uzh.ch/seminars/theory.html
------------------------------------------------------------------------------------------------------
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.ch
Phone: +41 44 633 36 06
Home: +41 44 844 42 50
[View Less]
Hi,
Next week's seminar talk will be given by Christopher Portmann:
Tuesday, Nov. 23, 16:30 in HIT J 52 on Hoenggerberg.
Best regards,
Stefan
__________________________________________________________
Trevisan's extractor in the presence of quantum side information
Randomness extraction involves the processing of purely classical
information and is therefore usually studied in the framework of
classical probability theory. However, such a classical treatment is
generally too restrictive …
[View More]for applications, where side information
about the values taken by classical random variables may be represented
by the state of a quantum system. This is particularly relevant in the
context of cryptography, where an adversary may make use of
quantum devices. Here, we show that the well known construction
paradigm for extractors proposed by Trevisan is sound in the presence
of quantum side information. We exploit the modularity of this paradigm
to give several concrete extractor constructions, which, e.g, extract all
the conditional (smooth) min-entropy of the source using a seed of
length poly-logarithmic in the input, or only require the seed to be
weakly random.
__________________________________________________________
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Dear all
Please be informed about the following Computer Science Colloquium.
With best regards,
Ilona Blatter
------------------------------------------------------------------------------------------------------
Date: Friday, November 19, 2010
Place: CAB G 61 (ETH Zentrum)
Time: 16:15
Hosts: Stefan Wolf, Ueli Maurer
Quantum Information and Privacy
Charles H. Bennett, IBM Research, Yorktown Heights (NY)
and
Gilles Brassard, DIRO, University of Montreal
Quantum effects, particularly the …
[View More]uncertainty principle, were
originaly regarded as a nuisance for information processing, making
quantum systems less reliable than their classical counterparts. But
beginning in the 1980’s with quantum money and the no-cloning theorem,
an appreciation of the intrinsically private nature of quantum states
led to a more positive view, paving the way for new kinds of
communication and cryptography and potentially dramatic computational
speedups.
We recall some of this history, including how a practical problem -
the need for privacy-conserving error correction of raw data generated
during quantum cryptography - stimulated the development of a
quantitative theory of entanglement and quantum error correction. In
subsequent decades the subtle relation between quantum coherence and
privacy has continued to yield insights and surprises, such as the
phenomena of data hiding and locking, and the existence of channels
with private capacity but no quantum capacity.
More information at: http://www.inf.ethz.ch/news/colloquium/
------------------------------------------------------------------------------------------------------
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.ch
Phone: +41 44 633 36 06
Home: +41 44 844 42 50
[View Less]
Dear all
Please be informed about the following QSIT Seminar.
With best regards,
Ilona Blatter
------------------------------------------------------------------------------------------------------
Date: Monday November 15, 2010
Time: 13:00
Place: HIT H 42
Host: Tilman Esslinger
Ramsey interferometry with Bose-Einstein condensates and atom lasers
Daniel Doering
The Australian National University, Canberra, Australia
Abstract: http://www.qsit.ethz.ch/news/talks/abstractDoering
---------…
[View More]---------------------------------------------------------------------------------------------
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.ch
Phone: +41 44 633 36 06
Home: +41 44 844 42 50
[View Less]