An entangling quantum-logic gate operated with an ultrabright single photon-source

Abstract

We demonstrate unambiguous entangling operation of a photonic quantum-logic gate driven by an ultrabright solid-state single-photon source. Indistinguishable single photons emitted by a single semiconductor quantum dot in a micropillar optical cavity are used as target and control qubits. For a source brightness of 0.56 collected photons-per-pulse, the measured truth table has an overlap with the ideal case of 68.4%, increasing to 73.0% for a source brightness of 0.17 photons- per-pulse. The gate is entangling: at a source brightness of 0.48, the Bell-state fidelity is above the entangling threshold of 50%, and reaches 71.0% for a source brightness of 0.15.

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Cited by in corpus (18)

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• Efficient out-coupling of high-purity single photons from a coherent quantum dot in a photonic-crystal cavity
• Cavity-Enhanced Two-Photon Interference using Remote Quantum Dot Sources
• Purcell enhanced and indistinguishable single-photon generation from quantum dots coupled to on-chip integrated ring resonators
• Near-unity indistinguishability single photon source for large-scale integrated quantum optics
• Heralded non-destructive quantum entangling gate with single-photon sources
• Engineering integrated photonics for heralded quantum gates
• Simple source for large linear cluster photonic states
• Photonic Quantum Logic with Narrowband Light from Single Atoms
• Heralded gate search with genetic algorithms for quantum computation
• Optical fibre-based (plug-and-play) single photon source using InAsP quantum dot nanowires and gradient-index lens collection
• Quantum metrology and its application in biology
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