June 2011 - ITP-quantumseminare - lists.phys.ethz.ch

QSIT Seminar, Fr July 1, 2011: Stefan Stahl
by QSIT Seminar 29 Jun '11

29 Jun '11

Dear all Please be informed about the following QSIT Seminar. With best regards, Sandra Künzel ------------------------------------------------------------------------------------------------------ Date: Friday July 1, 2011 Time: 14:00 Place: ETH Science City, HPF G 6 Host: Joseba Alonso Otamendi Cryogenic electronics for trap and quantum experiments Stefan Stahl Stahl Electronics, Mettenheim, Germany Abstract: http://www.nccr-qsit.ethz.ch/news/talks/abstractStahl ------------------------------------------------------------------------------------------------------ QSIT Seminar qsit-seminar(a)phys.ethz.ch ETH Zurich Sandra Künzel NCCR QSIT (Accounting) HPF E 17 8093 Zurich www.nccr-qsit.ethz.ch

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Group seminar Try 2: Ben Fortescue
by Frédéric Dupuis 28 Jun '11

28 Jun '11

Hi everyone, Ben Fortescue's talk will actually be in the center, in CAB G57, at 17:00. --Frédéric ---------------------------------------------- Speaker: Ben Fortescue Title: Going beyond the share size bound in quantum secret sharing. Date/Time: Monday, June 27, 17:00 Place: CAB G57 Abstract: Quantum secret sharing (QSS) is an important cryptographic protocol which allows a quantum secret to be split between multiple "players", such that only certain authorised player subsets may recover the secret. It is, however, costly in terms of quantum communication and storage; perfect QSS using quantum states requires every player's share to be at least as large as the original secret. I will discuss some of our recent results in which we improve upon this bound through the use of imperfect "ramp" secret sharing, which allows for smaller shares at the cost of weaker security. We find a specific class of "entanglement sharing" ramp protocols, which allow for smaller shares while still broadly restricting the protocols' information leakage. Finally I will demonstrate how, by incorporating classical encryption into "hybrid" QSS protocols, quantum share size can be reduced (sometimes drastically) without requiring any reduction in security. --- ETH Zurich Quantum Seminar List To subscribe/unsubscribe go to: https://webmail.phys.ethz.ch/mailman/listinfo/itp-quantumseminare --- ETH Zurich Quantum Seminar List To subscribe/unsubscribe go to: https://webmail.phys.ethz.ch/mailman/listinfo/itp-quantumseminare

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Group seminar Try 2: Ben Fortescue
by Frédéric Dupuis 28 Jun '11

28 Jun '11

Hi everyone, Since it appears to be our Destiny to hold our seminars on Tuesdays, we shall not tempt fate again, and Ben Fortescue's talk will be held today (Tuesday) at 17:00, in HIT K52. Your [insert adjective here] seminar organizer, --Frédéric ---------------------------------------------- Speaker: Ben Fortescue Title: Going beyond the share size bound in quantum secret sharing. Date/Time: Monday, June 27, 17:00 Place: HIT K52 Abstract: Quantum secret sharing (QSS) is an important cryptographic protocol which allows a quantum secret to be split between multiple "players", such that only certain authorised player subsets may recover the secret. It is, however, costly in terms of quantum communication and storage; perfect QSS using quantum states requires every player's share to be at least as large as the original secret. I will discuss some of our recent results in which we improve upon this bound through the use of imperfect "ramp" secret sharing, which allows for smaller shares at the cost of weaker security. We find a specific class of "entanglement sharing" ramp protocols, which allow for smaller shares while still broadly restricting the protocols' information leakage. Finally I will demonstrate how, by incorporating classical encryption into "hybrid" QSS protocols, quantum share size can be reduced (sometimes drastically) without requiring any reduction in security. --- ETH Zurich Quantum Seminar List To subscribe/unsubscribe go to: https://webmail.phys.ethz.ch/mailman/listinfo/itp-quantumseminare

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Group seminar reminder: Ben Fortescue
by Frédéric Dupuis 27 Jun '11

27 Jun '11

Hi everyone, Just a reminder that Ben Fortescue will be giving a seminar talk today at 17:00 in HIT K52. Your favorite seminar organizer, --Frédéric PS: If, for whatever reason, you collectively decide that K52 is unsuitable, we also have J51, J52 and J53 -- someone apparently missed the word "or" in the reservation request. :-) ---------------------------------------------- Speaker: Ben Fortescue Title: Going beyond the share size bound in quantum secret sharing. Date/Time: Monday, June 27, 17:00 Place: HIT K52 Abstract: Quantum secret sharing (QSS) is an important cryptographic protocol which allows a quantum secret to be split between multiple "players", such that only certain authorised player subsets may recover the secret. It is, however, costly in terms of quantum communication and storage; perfect QSS using quantum states requires every player's share to be at least as large as the original secret. I will discuss some of our recent results in which we improve upon this bound through the use of imperfect "ramp" secret sharing, which allows for smaller shares at the cost of weaker security. We find a specific class of "entanglement sharing" ramp protocols, which allow for smaller shares while still broadly restricting the protocols' information leakage. Finally I will demonstrate how, by incorporating classical encryption into "hybrid" QSS protocols, quantum share size can be reduced (sometimes drastically) without requiring any reduction in security. --- ETH Zurich Quantum Seminar List To subscribe/unsubscribe go to: https://webmail.phys.ethz.ch/mailman/listinfo/itp-quantumseminare

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Group seminar: Ben Fortescue
by Frédéric Dupuis 24 Jun '11

24 Jun '11

Hi everyone, Our group seminar will come out of its current lethargy on Monday with a talk by Ben Fortescue. Your ever-so-devoted seminar organizer, --Frédéric ---------------------------------------------- Speaker: Ben Fortescue Title: Going beyond the share size bound in quantum secret sharing. Date/Time: Monday, June 27, 17:00 Place: When I find a room, you'll be the first to know. Abstract: Quantum secret sharing (QSS) is an important cryptographic protocol which allows a quantum secret to be split between multiple "players", such that only certain authorised player subsets may recover the secret. It is, however, costly in terms of quantum communication and storage; perfect QSS using quantum states requires every player's share to be at least as large as the original secret. I will discuss some of our recent results in which we improve upon this bound through the use of imperfect "ramp" secret sharing, which allows for smaller shares at the cost of weaker security. We find a specific class of "entanglement sharing" ramp protocols, which allow for smaller shares while still broadly restricting the protocols' information leakage. Finally I will demonstrate how, by incorporating classical encryption into "hybrid" QSS protocols, quantum share size can be reduced (sometimes drastically) without requiring any reduction in security.

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QSIT Seminar, Wed June 22, 2011: Gérald Bastard
by QSIT Seminar 21 Jun '11

21 Jun '11

Dear all Please be informed about the following QSIT Seminar. With best regards, Sandra Künzel ------------------------------------------------------------------------------------------------------ Date: Wednesday June 22, 2011 Time: 11:00 Place: ETH Science City, HPF G 6 Host: Wolf Wüster Landau levels in quantum cascade structures Gérald Bastard LPA, Ecole Normale Supérieure, Paris, France ------------------------------------------------------------------------------------------------------- QSIT Seminar qsit-seminar(a)phys.ethz.ch ETH Zurich Sandra Künzel NCCR QSIT (Accounting) HPF E 17 8093 Zurich www.nccr-qsit.ethz.ch

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QSIT Seminar, Thu June 23, 2011: Vladimir Gritsev
by QSIT Seminar 21 Jun '11

21 Jun '11

Dear all Please be informed about the following QSIT Seminar. With best regards, Sandra Künzel ------------------------------------------------------------------------------------------------------ Date: Thursday June 23, 2011 Time: 16:00 Place: ETH Science City, HIT F 32 Host: Atac Imamoglu Dynamics of central spin models and nonlinear quantum optical systems Vladimir Gritsev University of Fribourg, Switzerland Abstracts: http://www.nccr-qsit.ethz.ch/news/talks/abstractGritsev ------------------------------------------------------------------------------------------------------- QSIT Seminar qsit-seminar(a)phys.ethz.ch ETH Zurich Sandra Künzel NCCR QSIT (Accounting) HPF E 17 8093 Zurich www.nccr-qsit.ethz.ch

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Seminar by Nicholas d'Ambrumenil, Tuesday June 21, 2011
by QSIT Seminar 17 Jun '11

17 Jun '11

Dear all Please be informed about the following seminar. With best regards, Ilona Blatter ------------------------------------------------------------------------------------------------------ Date: Tuesday June 21, 2011 Time: 11::00 Place: ETH Science City, HPF G 6 Host: Rudolf Morf Model for the Dissipative Conductance in Fractional Quantum Hall States Nicholas d'Ambrumenil University of Warwick, Coventry, UK Abstract: http://www.nccr-qsit.ethz.ch/news/talks/abstractAmbrumenil ------------------------------------------------------------------------------------------------------ ETH Zurich Dr. Ilona Blatter NCCR QSIT Coordinator Laboratory for Solid State Physics HPF E 17 Schafmattstrasse 16 8093 Zurich ilona.blatter(a)phys.ethz.ch www.nccr-qsit.ethz.ch Phone: +41 44 633 36 06 Home: +41 44 844 42 50

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QSIT Seminar, Thu June 16, 2011: Sabrina Maniscalo
by QSIT Seminar 14 Jun '11

14 Jun '11

Dear all Please be informed about the following QSIT Seminar. With best regards, Ilona Blatter ------------------------------------------------------------------------------------------------------ Date: Thursday June 16, 2011 Time: 11:00 Place: ETH Science City, HPF G 6 Host: Jonathan Home Non-Markovian open quantum systems: Why should we care? Sabrina Maniscalco University of Turku, Finland abstract: http://www.nccr-qsit.ethz.ch/news/talks/abstractManiscalo ------------------------------------------------------------------------------------------------------ ETH Zurich Dr. Ilona Blatter NCCR QSIT Coordinator Laboratory for Solid State Physics HPF E 17 Schafmattstrasse 16 8093 Zurich ilona.blatter(a)phys.ethz.ch www.nccr-qsit.ethz.ch Phone: +41 44 633 36 06 Home: +41 44 844 42 50

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QSIT Seminar: Yoav Lahini, Friday June 10, 2011
by QSIT Seminar 08 Jun '11

08 Jun '11

Dear all Please be informed about the following QSIT Seminar. With best regards, Ilona Blatter ------------------------------------------------------------------------------------------------------ Date: Friday June 10, 2011 Time: 14:00 Place: HPF G 6 Host: Atac Imamoglu Quantum walks and quantum correlations in photonic lattices Yoav Lahini Weizmann Institute of Science, Israel Quantum walks describe the random walk behavior of a quantum particle. I will describe the implementation of a quantum walk for photons in waveguide lattices. I will then describe a study of Hanbury-Brown Twiss type correlations between two quantum walkers (photon pairs) in periodic lattices, in disordered lattices exhibiting Anderson localization, and in tilted lattices exhibiting Bloch Oscillations. ------------------------------------------------------------------------------------------------------ ETH Zurich Dr. Ilona Blatter NCCR QSIT Coordinator Laboratory for Solid State Physics HPF E 17 Schafmattstrasse 16 8093 Zurich ilona.blatter(a)phys.ethz.ch www.nccr-qsit.ethz.ch Phone: +41 44 633 36 06 Home: +41 44 844 42 50

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