Multi-photon quantum interference with high visibility using multiport beam splitters

Abstract

Multi-photon states can be produced in multiple parametric down conversion (PDC) processes. The nonlinear crystal in such a case is pumped with high power. In theory, the more populated these states are, the deeper is the conflict with local realistic description. However, the interference contrast in multi-photon PDC experiments can be quite low for high pumping. We show how the contrast can be improved. The idea employs currently accessible optical devices, the multiport beam splitters. They are capable of splitting the incoming light in one input mode to $M$ output modes. Our scheme works as a POVM filter. It may provide a feasible CHSH-Bell inequality test, and thus can be useful in e.g. schemes reducing communication complexity.

8 pages, 7 figures

References in corpus (5)

• An experimental test of non-local realism
• Photon number resolution using a time-multiplexed single-photon detector
• Experimental entanglement of a six-photon symmetric Dicke state
• Multimode quantum interference of photons in multiport integrated devices
• Entanglement Witnesses and Measures for Bright Squeezed Vacuum

Cited by in corpus (2)

• Interference of macroscopic beams on a beam splitter: phase uncertainty converted into photon-number uncertainty
• Towards loophole-free Bell inequality test with preselected unsymmetrical singlet states of light