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

Abstract

Multi-photon interference is central to photonic quantum information processing and quantum simulation, usually requiring multiple sources of non-classical light followed by a unitary transformation on their modes. Here, we observe interference in the four-photon events generated by a single silicon waveguide, where the different modes are six frequency channels. Rather than requiring a unitary transformation, the frequency correlations of the source are configured such that photons are generated in superposition states across multiple channels, and interference effects can be seen without further manipulation. This suggests joint spectral engineering is a tool for controlling complex quantum photonic states without the difficulty of implementing a large unitary interferometer, which could have practical benefits in various applications of multi-photon interference.

8 pages, 5 figures

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Cited by in corpus (5)

• Wave Function Engineering for Spectrally-Uncorrelated Biphotons in the Telecommunication Band based on a Machine-Learning Framework
• Testing multi-photon interference on a silicon chip
• Diagnosing phase correlations in the joint spectrum of parametric downconversion using multi-photon emission
• Spatial entanglement and state engineering via four-photon Hong-Ou-Mandel interference
• Quantum interference with time-frequency modes and multiple-photons generated by a silicon nitride microresonator