Testing multi-photon interference on a silicon chip

Abstract

Multi-photon interference in large multi-port interferometers is key to linear optical quantum computing and in particular to boson sampling. Silicon photonics enables complex interferometric circuits with many components in a small footprint and has the potential to extend these experiments to larger numbers of interfering modes. However, loss has generally limited the implementation of multi-photon experiments in this platform. Here, we make use of high-efficiency grating couplers to combine bright and pure quantum light sources based on ppKTP waveguides with silicon circuits. We interfere up to 5 photons in up to 15 modes, verifying genuine multi-photon interference by comparing the results against various models including partial distinguishability between photons.

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• Multi-photon interference in the spectral domain by direct heralding of superposition states

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• Further Compactifying Linear Optical Unitaries
• Reducing $g^{(2)}(0)$ of a parametric down-conversion source via photon-number resolution with superconducting nanowire detectors
• Experimental demonstration of Gaussian boson sampling with displacement
• Two-boson quantum interference in time
• Multiparticle quantum interference in Bogoliubov bosonic transformations
• Spatial entanglement and state engineering via four-photon Hong-Ou-Mandel interference
• Complex structure and characterization of multi-photon split states in integrated circuits
• Computational indistinguishability and boson sampling
• Quantum Advantage with Timestamp Membosonsampling