Coarse Graining Makes It Hard to See Micro-Macro Entanglement

Details Coarse Graining Makes It Hard to See Micro-Macro Entanglement Coarse Graining Makes It Hard to See Micro-Macro Entanglement

2011-08-09

arxiv.org/abs/1108.2065v2

Phys. Rev. Lett. 107, 250401 (2011)

Physics

Quantum Physics

5 pages, 3 figures

Scientific paper

10.1103/PhysRevLett.107.250401

Observing quantum effects such as superpositions and entanglement in macroscopic systems requires not only a system that is well protected against environmental decoherence, but also sufficient measurement precision. Motivated by recent experiments, we study the effects of coarse-graining in photon number measurements on the observability of micro-macro entanglement that is created by greatly amplifying one photon from an entangled pair. We compare the results obtained for a unitary quantum cloner, which generates micro-macro entanglement, and for a measure-and-prepare cloner, which produces a separable micro-macro state. We show that the distance between the probability distributions of results for the two cloners approaches zero for a fixed moderate amount of coarse-graining. Proving the presence of micro-macro entanglement therefore becomes progressively harder as the system size increases.

Affiliated with

Also associated with

No associations

Rating

Coarse Graining Makes It Hard to See Micro-Macro Entanglement 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 Coarse Graining Makes It Hard to See Micro-Macro Entanglement, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Coarse Graining Makes It Hard to See Micro-Macro Entanglement will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-664344