June 2018 - ITP-quantumseminare - lists.phys.ethz.ch

today's meeting 15:30 E41.1
by Joe Renes 25 Jun '18

25 Jun '18

Hi all, we return to Monday meetings again this week. Henrik will tell us about his research. Best, -joe

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Fwd: Seminar Series on Quantum Paradoxes - Dynamic nonlocality, part four
by Lidia del Rio 20 Jun '18

20 Jun '18

Dear all, We are very pleased to invite you to Sandu Popescu's seminar series on Quantum Paradoxes, taking place tomorrow morning. Lecture 4: Dynamic nonlocality (part 4) and measurement dynamics (part 1) Thursday, 21st of June 2018, 10:15-11:15, room HCI J4, Campus Hönggerberg Sandu Popescu is a leading expert on quantum nonlocality and quantum foundations, and one of the founding figures of quantum information theory. He is Senior Fellow at the ETH Institute for Theoretical Studies and Professor at the University of Bristol. Cheers, Lídia

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visitor & talk tomorrow: Jonathan Oppenheim
by Lidia del Rio 18 Jun '18

18 Jun '18

Dear all, Jonathan Oppenheim from UCL will be in town tomorrow and will pass through ETH. He'll give an introductory talk about black holes and quantum information theory. It's at 4pm, room TBA. Best, Lídia

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group meetings moved to Mondays
by Joe Renes 16 Jun '18

16 Jun '18

Hi all, at the last group meeting we agreed to move the meeting back to Monday. This message is just to let you know that there's no meeting, either Monday or Thursday, in the upcoming week. We'll start with Monday meetings on the 25th of June. Best, -joe

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today's meeting: K51 @ 4pm
by Joe Renes 14 Jun '18

14 Jun '18

Hi all, today we'll hear from our visitor, Yelena Guryanova from IQOQI in Vienna, on the thermodynamic costs of measurement. Note the slightly different time and place! Best, -joe

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talk Christian Schilling tomorrow: E41.1 @3pm
by Joe Renes 12 Jun '18

12 Jun '18

Hi all, Tomorrow Christian Schilling will visit us and give a talk at 3pm in E41.1. Christian did his PhD in our group “back in the day”, with Matthias, and now is at Oxford. See below for title and abstract. Best, -joe Title: Reconstructing quantum states from single-party information Abstract: The possible compatibility of density matrices for single-party subsystems is described by linear constraints on their respective spectra. Whenever some of those quantum marginal constraints are saturated, the total quantum state has a specific, simplified structure. We prove that these remarkable global implications of extremal local information are stable, i.e. they hold approximately for spectra close to the boundary of the allowed region. Application of this general result to fermionic quantum systems allows us to characterize natural extensions of the Hartree-Fock ansatz and to quantify their accuracy by resorting to one-particle information, only: The fraction of the correlation energy not recovered by such an ansatz can be estimated from above by a simple geometric quantity in the occupation number picture.

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Popescu's seminar Thursday
by Lidia del Rio 12 Jun '18

12 Jun '18

Dear all, The next lecture in Sandu Popescu's series on Quantum Paradoxes will take place this Thursday in Hönggerberg: Title: Dynamic Nonlocality, Part 3 Thursday, 14th of June, 10:00, room HCI J4. Best wishes, Lídia

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Thursday's group meeting @3pm in K51
by Joe Renes 07 Jun '18

07 Jun '18

Hi all, we're in HIT K51 this week. Martî Perarnau-Llobet is visiting from the Max Planck Institute for Quantum Optics in Munich and will give a talk on recent research in quantum thermodynamics. See below for title and abstract. Best, -joe Title: Collective operations can extremely reduce work fluctuations Abstract: In this talk, I will discuss work extraction from N copies of a quantum system. When the same work-extraction protocol is implemented on each copy, the relative size of fluctuations decays as 1/\sqrt{N} due to the law of large numbers. We will instead consider protocols where the copies can be processed collectively, and see that work fluctuations can then disappear exponentially fast in N. As a consequence, a considerable proportion of the average extractable work W can be obtained almost deterministically by globally processing a few copies of the state. This will be shown in two canonical scenarios for work extraction: (I) in thermally isolated systems, where W corresponds to the energy difference between the initial and the passive state, and (ii) in the presence of a thermal bath, where W is given by the free energy difference between the initial and the thermal state.

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Fwd: [quantum-foundations] workshop on observables, June 18-22
by Lidia del Rio 04 Jun '18

04 Jun '18

-------- Forwarded Message -------- Subject: [quantum-foundations] workshop on observables, June 18-22 Date: Mon, 4 Jun 2018 09:28:52 +0000 From: GRINBAUM Alexei <Alexei.Grinbaum(a)cea.fr> Reply-To: GRINBAUM Alexei <Alexei.Grinbaum(a)cea.fr> To: GRINBAUM Alexei <Alexei.Grinbaum(a)cea.fr> Dear all, An interdisciplinary workshop on observables (June 18-22 at CEA Orme des Merisiers near Paris) will include several talks in quantum foundations. Full program attached. You are all welcome to attend (no fee). Best wishes, Alexei Dr. Alexei Grinbaum CEA-Saclay/IRFU/Larsim Tel +33 1 69 08 12 17

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