Quantum Institute: Visitor Schedule

The Quantum Lunch is regularly held on Thursdays in the Theoretical Division Conference Room, TA-3, Building 123, Room 121.
For more information, contact Diego Dalvit.
To add your name to the Quantum Lunch email list, contact Charlotte Lehman

Thursday, November 18, 2010
12:30 PM - 2:00 PM

Speaker: John Yard (CCS-3)

Technical Host: Wojciech Zurek

TOPIC: Squashed entanglement and quantum de Finetti theorems

Abstract
Quantum de Finetti theorems give quantitative bounds on the distance from the set of unentangled states to the set of states on AB having a symmetric extension to several copies of B. In this talk, I will present a recent advance in entanglement theory (Brandão, Christandl & Yard arXiv:1010.1750), which relates the 'squashed entanglement' of a quantum state to its distance from the set of unentangled states. I will show how this relation leads to a better bound than in previously known de Finetti-type theorems, while using completely different techniques from quantum coding theorem and quantum statistics. An integral part of the analysis is played by an operationally-motivated norm that quantifies the distinguishability of bipartite quantum states under local operations and classical communication.