Production of heralded pure single photons from imperfect sources using cross phase modulation

Details Production of heralded pure single photons from imperfect sources using cross phase modulation Production of heralded pure single photons from imperfect sources using cross phase modulation

2006-02-27

arxiv.org/abs/quant-ph/0602225v4

Phys. Rev. A 74, 032331 (2006)

Physics

Quantum Physics

8 pages, 8 EPS figures, RevTeX4. Following changes have been made in v.3: Title and abstract slightly changed; numerous minor

Scientific paper

10.1103/PhysRevA.74.032331

Realistic single-photon sources do not generate single photons with certainty. Instead they produce statistical mixtures of photons in Fock states $\ket{1}$ and vacuum (noise). We describe how to eliminate the noise in the output of the sources by means of another noisy source or a coherent state and cross phase modulation (XPM). We present a scheme which announces the production of pure single photons and thus eliminates the vacuum contribution. This is done by verifying a XPM related phase shift with a Mach-Zehnder interferometer.

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