Near-ideal spontaneous photon sources in silicon quantum photonics

Abstract

While integrated photonics is a robust platform for quantum information processing, architectures for photonic quantum computing place stringent demands on high quality information carriers. Sources of single photons that are highly indistinguishable and pure, that are either near-deterministic or heralded with high efficiency, and that are suitable for mass-manufacture, have been elusive. Here, we demonstrate on-chip photon sources that simultaneously meet each of these requirements. Our photon sources are fabricated in silicon using mature processes, and exploit a novel dual-mode pump-delayed excitation scheme to engineer the emission of spectrally pure photon pairs through intermodal spontaneous four-wave mixing in low-loss spiralled multi-mode waveguides. We simultaneously measure a spectral purity of $0.9904\pm 0.0006$, a mutual indistinguishably of $0.987\pm 0.002$, and $>90\%$ intrinsic heralding efficiency. We measure on-chip quantum interference with a visibility of $0.96\pm 0.02$ between heralded photons from different sources. These results represent a decisive step for scaling quantum information processing in integrated photonics.

References in corpus (9)

• Supplementary information for "Quantum supremacy using a programmable superconducting processor"
• Probing many-body dynamics on a 51-atom quantum simulator
• Boson sampling with 20 input photons in 60-mode interferometers at $10^{14}$ state spaces
• Chip-based photon quantum state sources using nonlinear optics
• Silicon Quantum Photonics
• Chip-to-chip quantum teleportation and multi-photon entanglement in silicon
• Probing multimode squeezing with correlation functions
• From three-photon GHZ states to ballistic universal quantum computation
• Dual-Pump Approach to Photon-Pair Generation: Demonstration of Enhanced Characterization and Engineering Capabilities