Le contenu de cette page n’est pas disponible en français. Veuillez nous en excuser.
 

The effect of initial correlations on the evolution of quantum states



Playing this video requires the latest flash player from Adobe.

Download link (right click and 'save-as') for playing in VLC or other compatible player.


(MP4 Medium Res, MP4 Low Res, MP3, PDF)

Recording Details

Speaker(s): 
Mark Byrd
Scientific Areas: 
Quantum Information
Collection/Series: 
Perimeter Institute Quantum Discussions
PIRSA Number: 
12100045

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.