Preservation of loss in linear-optical processing

Details Preservation of loss in linear-optical processing Preservation of loss in linear-optical processing

2010-10-29

arxiv.org/abs/1010.6302v3

Phys. Rev. A 84, 042304 (2011)

Physics

Quantum Physics

7 pages, 2 figures, expanded explanation

Scientific paper

10.1103/PhysRevA.84.042304

We propose a measure of quantum efficiency of a multimode state of light that quantifies the amount of optical loss this state has experienced, and prove that this efficiency cannot increase in any linear-optical processing with destructive conditional measurements. Any loss that has affected a state can neither be removed nor redistributed so as to further increase the efficiency in higher-efficiency modes at the expense of lower-efficiency modes. This result eliminates the possibility of catalytically improving photon sources.

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