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Photonic quantum computers are currently one of the primary candidates forfault-tolerant quantum computation. At the heart of the photonic quantumcomputation lies the strict requirement for suitable quantum sources e.g. highpurity, high brightness single photon sources. To build a practical quantumcomputer, thousands to millions of such sources are required. In this article,we theoretically propose a unique single-photon source design on a thin-filmlithium niobate (TFLN) platform co-integrated with superconducting nanowiresingle-photon detectors. We show that with a judicial design of single photonsource using thin film periodically poled lithium waveguides (PPLN),back-illuminated grating couplers (GCs) and directly bonded or integratedcavity coupled superconducting nanowire single-photon detectors (SNSPDs) canlead to a simple but practical high efficiency heralded single-photon sourceusing the current fabrication technology. Such a device will eliminate therequirement of out coupling of the generated photons and can lead to a fullyintegrated solution. The proposed design can be useful for fusion-based quantumcomputation and for multiplexed single photon sources and also for efficienton-chip generation and detection of squeezed light.

Photonic quantum computing on thin-film lithium niobate: Part I Design  of an efficient heralded single photon source co-integrated with  superconducting detectors