Phase measurement at the Heisenberg limit with three photons

Details Phase measurement at the Heisenberg limit with three photons Phase measurement at the Heisenberg limit with three photons

Feb 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005phrva..71b1802w&link_type=abstract

Physical Review A, vol. 71, Issue 2, id. 021802

Statistics

24

Photon Statistics And Coherence Theory, Foundations Of Quantum Mechanics, Measurement Theory, Metrology

Scientific paper

We describe an interferometer which is capable of measuring phase at a Heisenberg limit of 1/3 . The proposed interferometer, which consumes three indistinguishable photons, consists of two beam splitters with two-third reflectivity and two mirrors. It is shown that the oscillation period of the quantum interference is three times shorter than in the classical case and the interference visibility is 100%. A de Broglie wavelength given by λ0 /3 can then be observed in this scheme, where λ0 is the wavelength of a single photon. Compared with similar phase measurements [

Mitchell et al., Nature (London) 429, 161 (2004)

;

Walter et al., ibid. 429, 158 (2004)

] by multiphoton maximally entangled states (MES), a three-photon MES is not generated in our proposal.

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