On-demand semiconductor source of entangled photons which simultaneously has high fidelity, efficiency, and indistinguishability

Abstract

An outstanding goal in quantum optics and scalable photonic quantum technology is to develop a source that each time emits one and only one entangled photon pair with simultaneously high entanglement fidelity, extraction efficiency, and photon indistinguishability. By coherent two-photon excitation of a single InGaAs quantum dot coupled to a circular Bragg grating bullseye cavity with broadband high Purcell factor up to 11.3, we generate entangled photon pairs with a state fidelity of 0.90(1), pair generation rate of 0.59(1), pair extraction efficiency of 0.62(6), and photon indistinguishability of 0.90(1) simultaneously. Our work will open up many applications in high-efficiency multi-photon experiments and solid-state quantum repeaters.

7 pages, 7 figures, PRL to appear

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Cited by in corpus (5)

• A solid-state entangled photon pair source with high brightness and indistinguishability
• Deterministically Fabricated Solid-State Quantum-Light Sources
• Two-photon spontaneous emission in atomically thin plasmonic nanostructures
• On-demand generation of entangled photon pairs in the telecom C-band for fiber-based quantum networks
• Biexciton Initialization by Two-Photon Excitation in Site-Controlled Quantum Dots: the Complexity of the Antibinding State Case