Q+ Hangout: Miguel Navascues
Next Q+ Hangout is on November 8th!
As usual, if you are watching with a group and want to reserve a seat in the hangout then leave a comment here:
We also encourage individuals interested in active participation---which typically involves asking questions after the talk---to join the hangout. Otherwise you can watch on the livestream. Details follow.
Speaker: Miguel Navascues
Title: Entanglement and Nonlocality of 1D Macroscopic Systems
Abstract: We consider the problem of certifying entanglement and nonlocality in one-dimensional macroscopic systems when just averaged near-neighbor correlators are available. We map this question to the characterization of the set of all quantum states (distributions) which admit a separable (classical) Translation-Invariant (TI) extension to infinitely many sites. We advance the first problem by constructing a family of witnesses which can detect entanglement in infinite TI states from the nearest-neighbor reduced density matrix. Along the way, we identify a set of separable two-qubit states which only admit entangled TI extensions. For nonlocality detection, we show that the set of classical TI boxes forms a polytope and devise a general procedure to generate all Bell inequalities which characterize it. Through a Matrix Product State-based method, we show how some of them can be violated by distant parties conducting identical measurements on an infinite TI quantum state.
Livestream link: https://www.youtube.com/watch?v=awvdeBtcubY
To keep up to date with the latest news on Q+ hangouts you can follow us on:
or visit our website at http://qplus.burgarth.de