Physics – Quantum Physics
Scientific paper
2010-10-14
Phys. Rev. A 83, 012313 (2011)
Physics
Quantum Physics
7 pages, 4 figures (revised version)
Scientific paper
We propose a scheme for unambiguous state comparison (USC) of two unknown squeezed vacuum states of an electromagnetic field. Our setup is based on linear optical elements and photon-number detectors, and achieves optimal USC in an ideal case of unit quantum efficiency. In realistic conditions, i.e., for non-unit quantum efficiency of photodetectors, we evaluate the probability of getting an ambiguous result as well as the reliability of the scheme, thus showing its robustness in comparison to previous proposals.
Buzek Vladimir
Olivares Stefano
Paris Matteo G. A.
Rapcan Peter
Sedlak Michal
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