Mitigating indistinguishability issues in photon pair sources by delayed-pump Intermodal Four Wave Mixing

Abstract

Large arrays of independent, pure and identical heralded single photon sources are ubiquitous in today's Noise Intermediate Scale Quantum devices (NISQ). In the race towards the development of increasingly ideal sources, delayed-pump Intermodal Four Wave Mixing (IFWM) in multimode waveguides has recently demonstrated record performances in all these metrics, becoming a benchmark for spontaneous sources in integrated optics. Despite this, fabrication imperfections still spoil the spectral indistinguishability of photon pairs from independent sources. Here we show that by tapering the width of the waveguide and by controlling the delay between the pump pulses, we add spectral tunability to the source while still inheriting all the record metrics of the IFWM scheme. This feature is used to recover spectral indistinuishability in presence of fabrication errors. Under realistic tolerances on the waveguide dimensions, we predict >99.5% indistinguishability between independent sources on the same chip, and a maximum degradation of the Heralded Hong Ou Mandel visibility <0.35 %.

References in corpus (29)

• Integrated Photonic Quantum Technologies
• Quantum circuits with many photons on a programmable nanophotonic chip
• Chip-based photon quantum state sources using nonlinear optics
• Chip-to-chip quantum teleportation and multi-photon entanglement in silicon
• Integrated spatial multiplexing of heralded single photon sources
• Efficient and low-noise single-photon-level frequency conversion interfaces using silicon nanophotonics
• Qubit entanglement on a silicon photonic chip
• Probing multimode squeezing with correlation functions
• Generation and sampling of quantum states of light in a silicon chip
• Near-ideal spontaneous photon sources in silicon quantum photonics
• Programmable four-photon graph states on a silicon chip
• Error protected qubits in a silicon photonic chip
• Efficient algorithm for boson sampling with partially distinguishable photons
• Widely tunable single photon source with high purity at telecom wavelength
• Limits on the heralding efficiencies and spectral purities of spectrally-filtered single photons from photon pair sources
• Independent high-purity photons created in domain-engineered crystals
• Effect of Loss on Multiplexed Single-Photon Sources
• Sufficient bound on the mode mismatch of single photons for scalability of the boson sampling computer
• Strongly driven nonlinear quantum optics in microring resonators
• Spontaneous parametric downconversion in waveguides: What's loss got to do with it?
• On the effects of self- and cross-phase modulation on photon purity for four-wave mixing photon-pair sources
• High spectro-temporal purity single-photons from silicon micro-racetrack resonators using a dual-pulse configuration
• Spectrally pure heralded single photons by spontaneous four-wave mixing in a fiber: reducing impact of dispersion fluctuations
• Hard limits on the postselectability of optical graph states
• The effects of filtering on the purity of heralded single photons from parametric sources
• A silicon source of heralded single photons at 2 $\mu$m
• The effect of self- and cross-phase modulation on photon-pairs generated by spontaneous four-wave mixing in integrated optical waveguides
• Photon-pair generation by non-instantaneous spontaneous four-wave mixing
• Complete evolution equation for the joint amplitude in photon-pair generation