Filtering of the absolute value of photon-number difference for two-mode macroscopic quantum states

Details Filtering of the absolute value of photon-number difference for two-mode macroscopic quantum states Filtering of the absolute value of photon-number difference for two-mode macroscopic quantum states

2011-08-24

arxiv.org/abs/1108.4906v1

Physics

Quantum Physics

5 pages, 5 figures

Scientific paper

We propose a filter that selects two-mode high number Fock states whose photon-number difference exceeds a certain value. Such a filter is important for the engineering of macroscopic quantum states of light and for the control of bright light beams. It improves distinguishability of some states but preserves macroscopic superpositions. We suggest an operational implementation of such a filter. To this end we employ an interference effect in which two input ports of a beamsplitter are entered by highly populated multi-photon states. If the photon numbers at the two input ports are almost equal, the photons are highly asymmetrically distributed between the two outputs. If photon numbers differ a lot, the exit ports get nearly equal photon occupation numbers.

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