Hi all,

this is a reminder of Mark Byrd's talk today at 4pm in the Time Room.

Best wishes,
Markus



Title: The effect of initial correlations on the evolution of quantum states
Speaker: Mark Byrd (Southern Illinois University)

Abstract:
Until fairly recently, it was generally assumed that the initial state of a quantum system prepared for information processing was in a product state with its environment.  If this is the case, the evolution is described by a completely positive map.  However, if the system and environment are initially correlated, or entangled, such that the so-called quantum discord is non-zero, then the evolution is described by a map which is not completely positive. Maps that are not completely positive are not as well understood and the implications of having such a map are not completely known.  I will discuss a few examples and a theorem (or two) which may help us understand the implications of having maps which are not completely positive.


Date: October 15, 2012 - 4:00 pm
Series: Perimeter Institute Quantum Discussions
Location: Time Room