Multipath Correlation Interference and Controlled-NOT Gate Simulation with a Thermal Source

Abstract

We theoretically demonstrate a counter-intuitive phenomenon in optical interferometry with a thermal source: the emergence of second-order interference between two pairs of correlated optical paths even if the time delay imprinted by each path in one pair with respect to each path in the other pair is much larger than the source coherence time. This fundamental effect could be useful for experimental simulations of small-scale quantum circuits and of $100\%$-visibility correlations typical of entangled states of a large number of qubits, with possible applications in high-precision metrology and imaging. As an example, we demonstrate the polarization-encoded simulation of the operation of the quantum logic gate known as controlled-NOT gate.

New Journal of Physics (Fast Track Communication, in press, 6 pages, 3 figures)

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• Spatial interference between pairs of disjoint optical paths with a single chaotic source
• Characterization of two distant double-slits by chaotic light second-order interference
• General considerations in unbalanced fourth-order interference
• Simulating Dicke like superradiance with classical light sources
• Distance sensing emerging from second-order interference of thermal light
• Phase Dependent Hanbury-Brown and Twiss effect
• The physics of thermal light second-order interference beyond coherence
• An optical multimode fiber as pseudothermal light source
• Optical interference by amplitude measurement