Related papers: Integrate and scale: A source of spectrally separable photon pairs

Integrate and scale: A source of spectrally separable photon pairs

URL: http://arxiv.org/abs/2303.17258v1
Date: Thu, 30 Mar 2023 09:44:08 GMT
Title: Integrate and scale: A source of spectrally separable photon pairs
Authors: Ben M. Burridge, Imad I. Faruque, John G. Rarity, Jorge Barreto
Abstract summary: Integrated photonics is a powerful contender in the race for a fault-tolerant quantum computer. We create high-quality quantum states using an all-around high-performing photon source on an integrated photonics platform.
Score: 0.17205106391379024
License: http://creativecommons.org/licenses/by-nc-nd/4.0/
Abstract: Integrated photonics is a powerful contender in the race for a fault-tolerant quantum computer, claiming to be a platform capable of scaling to the necessary number of qubits. This necessitates the use of high-quality quantum states, which we create here using an all-around high-performing photon source on an integrated photonics platform. We use a photonic molecule architecture and broadband directional couplers to protect against fabrication tolerances and ensure reliable operation. As a result, we simultaneously measure a spectral purity of $99.1 \pm 0.1$ %, a pair generation rate of $4.4 \pm 0.1$ MHz mW$^{-2}$, and an intrinsic source heralding efficiency of $94.0 \pm 2.9$ %. We also see a maximum coincidence-to-accidental ratio of $1644 \pm 263$. We claim over an order of magnitude improvement in the trivariate trade-off between source heralding efficiency, purity and brightness. Future implementations of the source could achieve in excess of $99$ % purity and heralding efficiency using state-of-the-art propagation losses.

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