On-chip transverse-mode entangled photon pair source

Abstract

Integrated entangled photon pair source is an essential resource for both fundamental investigations and practical applications of quantum information science. Currently there have been several types of entanglement, among which the transverse-mode entanglement is becoming attractive because of its unique advantages. Here, we report an on-chip transverse-mode entangled photon pair source via the spontaneous four-wave mixing processes in a multimode silicon waveguide. Transverse-mode photon pairs are verified over multiple frequency channels within a bandwidth of $\sim$2~THz, and a maximally entangled Bell state is also produced with a net fidelity of $0.96\pm 0.01$. Our entangled photon pair source is the key element for quantum photonics based on transverse-mode, and also has the possibility to extend to higher-dimensional Hilbert space. Furthermore, the transverse-mode entanglement can be converted coherently to path and polarization entanglement, which paves the way to realizing highly complex quantum photonic circuits with multiple degrees of freedom.

7 pages, 4 figures

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• Quantum Experiments and Hypergraphs: Multi-Photon Sources for Quantum Interference, Quantum Computation and Quantum Entanglement
• On-chip quantum interference between the origins of a multi-photon state
• Generation of a frequency-degenerate four-photon entangled state using a silicon nanowire
• Proposal for stable atom trapping on a GaN-on-Sapphire chip
• Quantum States of Higher-order Whispering gallery modes in a Silicon Micro-disk Resonator
• Broadband mode exchanger based on subwavelength Y-junctions
• Spatio-Spectral Quantum State Estimation of Photon Pairs from Optical Fiber Using Stimulated Emission