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Next Q+ Hangout is on November 8th, 2 pm GMT.

As usual, if you are watching with a group and want to reserve a seat in the hangout then leave a comment. 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

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Marco Piani's profile photoIan Durham's profile photoPranay Barkataki's profile photoDaniel Burgarth's profile photo
19 comments
 
Vienna would like to participate (we can't have enough of Miguel!)
 
I'd like to participate but will cede my seat to a large group if need be. (And now I just have to figure out if daylight savings time will be over by then...)
 
Our group in Edinburgh and Paris, would also like to participate
 
I'd like to participate please.
Q+
 
+Ian Durham Good point :) In UK we change this weekend. Seat reserved.
 
I'd like to participate Q+ Please

Q+
 
+Elie Wolfe  seat reserved
+Petros Wallden ok please send me (burgarth@gmail.com) the two email addresses to which the invites should go
+ichou hamza +Shoaib Masood are you joining as individuals or as a group? Where are you based?
 
Hi, could I reserve a seat for Strathclyde? If that works, I will send you the details of the people to contact for the invitation. Thanks!

 
I am going to have to forfeit my seat as it turns out I have an appointment that I cannot change.

 
I am joining as an individual and I am from India and I am currently pursuing PhD. in theoretical physics from VNIT, Nagpur India
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