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High-visibility multi-photon interference for classical light

This publication from the M.V. Lomonosov Moscow State University explores the advancements in multi-photon interference for classical light sources. Transcending the classical visibility limit of 50% in two-photon interference, this research highlights improved visibility limits of 81.8% for three-photon and 94.4% for four-photon interference. The experimental setup utilizing a Nd:YAG laser and photodetectors has been instrumental in verifying these results. Additionally, the findings suggest that the visibility of interference patterns can serve as indicative signatures of nonclassical light behavior.

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High-visibility multi-photon interference for classical light

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  1. Department of Physics M. V. Lomonosov Moscow State University Laboratory of Spontaneous Parametric Down Conversioon High-visibility multi-photon interference for classical light M. V . Chekhova T. Sh. Iskhakov I. N. Agafonov

  2. Introduction • Classical visibility limit for two-photon interference: 50%. • Multi-photon Interference of nonclassical light • Classical visibility limit for multi-photon Interference

  3. Principal scheme 1 Single counts A CC 2 B 3 Double counts Triple counts

  4. S YAG:Nd 2w GP1 CaCO3 EOM GP2 BS2 P3 A3 BS1 A2 P1 D3 A1 D2 D1 TCC Experimental set-up • Source: 532 nm, 3kHz rep. rate, pulse 5 ns • EOM: bias voltage ~ 50 Hz, 85V • Slit: 150 microns; separation 1.3 mm • BS1: 33%, BS2: 50%; P1,P3: 60 mm thick glass plates • CC: 4.2 ns window

  5. Third-order interference Vth =70.5%, Coherent statistics two detectors moving Coherent statistics one detector moving

  6. Third-order interference Thermal statistics two detectors moving

  7. Hidden polarization: three-photon case 1 L CC Coherent statistics two rotating polarizers 2 R 3

  8. Rotating disc Fourth-order interference: setup CaCO3 YAG:Nd EOM 50 Hz Canon PowerShot S2 IS 1:60 s per frame, 500 frames

  9. Experimental results

  10. Conclusions • Classical multi-photon visibility limit (81.8% for 3-photon, 94.4% for 4-photon interference) is much higher than in the two-photon case (50%). • If visibility of interference pattern is recognized as a “signature” of nonclassicality, it should exceed 81.8% in the three-photon case and 94.4% in the four-photon one.

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