Sadegh Raeisi, Pavel Sekatski, Christoph Simon
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.
View original:
http://arxiv.org/abs/1108.2065
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