November 2017 - ITP-quantumseminare

Last second room change
by Joe Renes 27 Nov '17

27 Nov '17

We're upstairs

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change to today's meeting
by Joe Renes 27 Nov '17

27 Nov '17

Hi all, unfortunately our would-be guest is ill, so he will not be able to make it to the group meeting. Instead Volkher volunteered to tell us a bit about error-correction, recoverability, and AdS-CFT. Best, -joe

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tomorrow's group meeting E41.1 @ 15:45
by Joe Renes 25 Nov '17

25 Nov '17

Hi all, tomorrow we'll hear from Christian Schilling, who did his PhD with last week's visitor Matthias Christandl and is now a postdoc in Oxford. Here's the title and abstract: 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. Best, -joe

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today's group meeting E41.1 @ 15:45
by Joe Renes 20 Nov '17

20 Nov '17

Hi all, today I'll say a few words about how min entropy very naturally shows up in questions of state conversion. Best, -joe

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today's group meeting E41.1 @ 15:45
by Joe Renes 13 Nov '17

13 Nov '17

Hi all, today we will hear from Lennart on his semester project with David. Best, -joe

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today's meeting E41.1 @ 15:45
by Joe Renes 06 Nov '17

06 Nov '17

Hi all, with any luck the QIP decisions will be out before our meeting, so it might be fun to look through the list and see what's interesting. Note that there is also a theory colloquium today: http://www.theorycolloquium.phys.ethz.ch/ Best, -joe

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