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Optimal design and quantum benchmarks for coherent state amplifiers

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arxiv 1301.1170 v6 pith:WAV24UZV submitted 2013-01-07 quant-ph math-phmath.MP

classification quant-phmath-phmath.MP
keywords amplificationquantumcoherentexpectedfinitenumberphotonstate
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We establish the ultimate quantum limits to the amplification of an unknown coherent state, both in the deterministic and probabilistic case, investigating the realistic scenario where the expected photon number is finite. In addition, we provide the benchmark that experimental realizations have to surpass in order to beat all classical amplification strategies and to demonstrate genuine quantum amplification. Our result guarantees that a successful demonstration is in principle possible for every finite value of the expected photon number.

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