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On-demand semiconductor source of entangled photons which simultaneously has high fidelity, efficiency, and indistinguishability
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On-demand semiconductor source of entangled photons which simultaneously has high fidelity, efficiency, and indistinguishability
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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.
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Cited by 1 Pith paper
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A diode nanocavity for fast, efficient and tunable emission of highly entangled photon pairs and Fourier-transform-limited single photons
A GaAs quantum dot in a p-i-n diode circular Bragg grating emits tunable entangled pairs (concurrence >0.89 over 1.6 nm) and nearly Fourier-limited indistinguishable single photons (V_HOM=0.951) with η_ext≈0.55 and F_P≈8.
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