Phys. Rev. Lett. 74, 4835–4838 (1995)Photonic de Broglie WavesReceived 25 January 1995; revised 10 April 1995; published in the issue dated 12 June 1995 In quantum optics an ensemble of photons is treated as a Bose condensate which has a de Broglie wavelength given by λ0/N where λ0 and N are the wavelength and average number of constituent photons, respectively. We describe an interferometer which is capable of measuring this de Broglie wavelength. We show specifically that a coherent state input has a de Broglie coherence length proportional to 1/√N. Finally we show that the interferometer is Heisenberg limited in sensitivity ( Δφmin = 1/N) and thus forms a new class of interferometers operating at the fundamental quantum limit. © 1995 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.74.4835
DOI:
10.1103/PhysRevLett.74.4835
PACS:
42.25.Hz, 42.50.Ar
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