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High-efficiency single-photon source above the loss-tolerant threshold for efficient linear optical quantum computing
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Photon loss is the biggest enemy for scalable photonic quantum information processing. This problem can be tackled by using quantum error correction, provided that the overall photon loss is below a threshold of 1/3. However, all reported on-demand and indistinguishable single-photon sources still fall short of this threshold. Here, by using tailor shaped laser pulse excitation on a high-quantum efficiency single quantum dot deterministically coupled to a tunable open microcavity, we demonstrate a high-performance source with a single-photon purity of 0.9795(6), photon indistinguishability of 0.9856(13), and an overall system efficiency of 0.712(18), simultaneously. This source for the first time reaches the efficiency threshold for scalable photonic quantum computing. With this source, we further demonstrate 1.89(14) dB intensity squeezing, and consecutive 40-photon events with 1.67 mHz count rate.
Forward citations
Cited by 4 Pith papers
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Quantifying Pauli Errors in Single-Photon Resource-State Generation
A scheme that extracts Pauli error rates for emitter-generated photonic resource states from first-order coherence and cross-correlation measurements.
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A 20-minute BB84 run with a quantum-dot single-photon source yields ≈2.2×10^6 finite-size secure bits under a security proof that explicitly includes beamsplitter, detector-efficiency, dark-count, and multiphoton unce...
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Multi-photon emission from a resonantly pumped quantum dot
A resonantly pumped quantum dot can emit up to four photons per pulse, and time-gating the detection improves single-photon purity.
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Towards experimental demonstration of quantum position verification using true single photons
A loss-tolerant quantum position verification prover is implemented with a quantum-dot single-photon source, but measured parallel-qubit fidelity (0.48) falls below the 2/3 LOCC threshold.
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