Hi all,
The talk of Markus Frembs tomorrow at 14:00 will take place in HIT J 43.1 instead of HIT E 41.1.
Best, Ladina
On 29 Aug 2022, at 10:45, Ladina Hausmann hladina@phys.ethz.ch wrote:
Hi all,
Instead of the seminar tomorrow there will be a talk on Thursday by our visitor Markus Frembs from Griffith University about 'Bipartite entanglement and the arrow of time’ See below for the abstract. The talk will take place on Thursday (01.09) at 2pm in E41.1 or on Zoom: https://ethz.zoom.us/j/362994444.
Best, Ladina
%%%%%%%%%% Quantum correlations in general and quantum entanglement in particular embody both our continued struggle towards a foundational understanding of quantum theory as well as the latter’s advantage over classical physics in various information processing tasks. Consequently, the problems of classifying (i) quantum states from more general (non-signalling) correlations, and (ii) entangled states within the set of all quantum states, are at the heart of the subject of quantum information theory.
In this talk I will present two recent results (from https://arxiv.org/abs/2204.11471 and https://arxiv.org/abs/2207.00024) that shed new light on these problems, by exploiting a surprising connection with time in quantum theory: First, I will sketch a solution to problem (i) for the bipartite case, which identifies a key physical principle obeyed by quantum theory: quantum states preserve local time orientations—roughly, the unitary evolution in local subsystems. Second, I will show that time orientations are intimately connected with quantum entanglement: a bipartite quantum state is separable if and only if it preserves arbitrary local time orientations. As a variation of Peres’s well-known entanglement criterion, this provides a solution to problem (ii).
On 29 Aug 2022, at 09:59, Ladina Hausmann hladina@phys.ethz.ch wrote:
Hi all,
there is no group seminar scheduled for tomorrow.
Best,
Ladina
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