August 2011 - ITP-quantumseminare

QSIT Seminar, Fr September 2, 2011: Jordi Muri-Petit
by QSIT Seminar 30 Aug '11

30 Aug '11

Dear all Please be informed about the following QSIT Seminar. With best regards, Sandra Künzel ------------------------------------------------------------------------------------------------------ Date: Friday September 2, 2011 Time: 11:00 Place: Universität Basel, small lecture PC room Host: Stefan Willitsch Quantum Logic for Molecular Spectroscopy Jordi Muri-Petit CSIC, Madrid, Spain http://www.nccr-qsit.ethz.ch/news/talks QSIT Seminar qsit-seminar(a)phys.ethz.ch ETH Zurich Sandra Künzel NCCR QSIT (Finances) HPF E 17 8093 Zurich www.nccr-qsit.ethz.ch

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Thursday Sept.1: QSIT Lunch Seminar
by QSIT Seminar 29 Aug '11

29 Aug '11

Dear QSIT members The next QSIT Lunch Seminar will take place on Thursday Sept. 1 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. The thermodynamic meaning of negative entropy Johan Aarberg, Institute for Theoretical Physics, ETH Zurich and Low-Temperature Nuclear Spin Relaxation in an All-Electrical Lateral Spin Transport Device Dominikus Kölbl, Quantum Coherence Lab, University of Basel Please register for your free pizza at the following link by Tuesday August 30, 12:00 noon: http://www.doodle.com/3x32m82ebma59zzb 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 QSIT Seminar qsit-seminar(a)phys.ethz.ch ETH Zurich Sandra Künzel NCCR QSIT (Finances) HPF E 17 8093 Zurich www.nccr-qsit.ethz.ch

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Group seminar: Sebastian Seehars
by Frédéric Dupuis 22 Aug '11

22 Aug '11

Hello everyone, As you may have guessed from the title of the email, we will have a group seminar soon. More precisely on Monday (!), August 22, at 16:00 in HIT K51. Sebastian Seehars will present his masters thesis. Your outstanding seminar organizer, --Frédéric ------------------------------------------- Speaker: Sebastian Seehars Title: Symmetric Extensions — Applications to Entanglement Detection and Quantum Key Distribution Date/Time/Place: Monday, August 22, 16:00, HIT K51 Abstract: A bipartite quantum state is called symmetrically extendible if there exists an extension to N Bobs such that tracing out all but any single one of them results in the original quantum state. Symmetric extensions are well known in the framework of entanglement detection as they give rise to an efficient solution of the weak membership problem of separability: Given an arbitrary bipartite quantum state, decide if it is entangled or ε-close to the set of separable states. In my talk, I will give a short introduction to the topic of symmetric extensions and present new applications to quantum key distribution. It turns out that we can find upper bounds to the secret key rate of a state by considering its symmetric extendibility and the conditional mutual information of its extensions. We apply this technique to get improved upper bounds for the family of isotropic states. The talk is based on results from my master thesis, supervised by Matthias Christandl and Michael Walter.

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Quantum information seminar: Valentina Caprara
by Frédéric Dupuis 22 Aug '11

22 Aug '11

Hi everyone, Our seminar will be in overdrive this week with a second talk by Valentina Caprara on Tuesday at 17:00 in HIT K52. Your amazing organizer, --Frédéric PS: Note that our seminar is now officially called the "Quantum information seminar" instead of "Group seminar", for a number of excellent reasons that Lídia will be happy to explain if you ask her. ------------------------------ Speaker: Valentina Caprara Date/Time/Place: Tuesday, August 23, 17:00, HIT K52 Title: Memory effects in Anderson Localization

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D-GESS
by Matthias Christandl 18 Aug '11

18 Aug '11

Dear all, see attachment for physics talk in D-GESS. Best wishes, Matthias. Register for: 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

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Seminar: Friday Aug 12, 2011: Pierre Barthelemy
by QSIT Seminar 10 Aug '11

10 Aug '11

Dear all Please be informed about the following Seminar. With best regards, Sandra Künzel ------------------------------------------------------------------------------------------------------ Date: Friday Aug 12, 2011 Time: 16:00 Place: ETH Science City, HPF G 6 Host: Wolf Wüst Towards Quantum Simulations of the Hubbard model with quantum dot arrays Pierre Barthelemy TU Delft > Abstract: > > The study of strongly correlated electrons systems is often difficult > due to the complexity of interacting quantum systems. Even for > moderate size systems, the complexity is too large to be solvable by > numerical calculations with classical computers. Feynman[1], and later > Lloyd[2], proposed to solve this problem by building controllable and > clean quantum systems simulating the Hamiltonian one wants to solve, > and study the physics of this Hamiltonian through experiments on these > controlled quantum systems. > > Laterally-defined quantum dots display very interesting features for a > quantum simulator. They naturally map the Hubbard Hamiltonian, their > tunability is excellent, and their use in dilution fridge allows > access to low temperature phases of the Hubbard model, where magnetic > ordering effects start to appear. > > In this talk, I will present two different projects aiming to use > laterally defined dots for quantum simulations. I will show that a > plaquette of four dots allows studying a rather surprising effect > called Nagaoka’s ferromagnetism and I will present ideas to realize > large arrays of quantum dots for the study of Mott Insulating systems, > and, maybe, the observation of the onset of large scale magnetic > ordering in the Hubbard model. > > > > [1] Feynman, Simulating Physics with Computers. International Journal > of Theoretical Physics 21: 467, (1982) > [2] Lloyd, Universal quantum simulators. Science 273, 5278, (1996) ETH Zurich Sandra Künzel NCCR QSIT (Accounting) HPF E 17 8093 Zurich www.nccr-qsit.ethz.ch

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Workshop: Quantum Information and Foundations of Thermodynamics, 9th-12th August 2011
by QSIT Seminar 08 Aug '11

08 Aug '11

Dear all Please be informed that Rento Renner and his group are organizing the following workshop: Quantum Information and Foundations of Thermodynamics Workshop: ETH Zurich, 9th-12th August 2011 Further information: http://www.qit.ethz.ch/workshops/QIFTW11 With best regards, Ilona Blatter ------------------------------------------------------------------------------------------------------ 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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