Quantum optics of lossy asymmetric beam splitters

Abstract

We theoretically investigate quantum interference of two single photons at a lossy asymmetric beam splitter, the most general passive 2$\times$2 optical circuit. The losses in the circuit result in a non-unitary scattering matrix with a non-trivial set of constraints on the elements of the scattering matrix. Our analysis using the noise operator formalism shows that the loss allows tunability of quantum interference to an extent not possible with a lossless beam splitter. Our theoretical studies support the experimental demonstrations of programmable quantum interference in highly multimodal systems such as opaque scattering media and multimode fibers.

References in corpus (4)

• Silica-on-Silicon Waveguide Quantum Circuits
• Coherent perfect absorption in deeply subwavelength films in the single photon regime
• An atomic Hong-Ou-Mandel experiment
• Programmable two-photon quantum interference in $10^3$ channels in opaque scattering media

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