Causal and localizable quantum operations

Details Causal and localizable quantum operations Causal and localizable quantum operations

2001-02-08

arxiv.org/abs/quant-ph/0102043v2

Phys.Rev. A64 (2001) 052309

Physics

Quantum Physics

23 pages, 7 figures, REVTeX, minor changes and references added

Scientific paper

10.1103/PhysRevA.64.052309

We examine constraints on quantum operations imposed by relativistic causality. A bipartite superoperator is said to be localizable if it can be implemented by two parties (Alice and Bob) who share entanglement but do not communicate; it is causal if the superoperator does not convey information from Alice to Bob or from Bob to Alice. We characterize the general structure of causal complete measurement superoperators, and exhibit examples that are causal but not localizable. We construct another class of causal bipartite superoperators that are not localizable by invoking bounds on the strength of correlations among the parts of a quantum system. A bipartite superoperator is said to be semilocalizable if it can be implemented with one-way quantum communication from Alice to Bob, and it is semicausal if it conveys no information from Bob to Alice. We show that all semicausal complete measurement superoperators are semilocalizable, and we establish a general criterion for semicausality. In the multipartite case, we observe that a measurement superoperator that projects onto the eigenspaces of a stabilizer code is localizable.

Affiliated with

Also associated with

No associations

Rating

Causal and localizable quantum operations does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Causal and localizable quantum operations, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Causal and localizable quantum operations will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-90320