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 bull’s-eye cavity with a broadband high Purcell factor of 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 multiphoton experiments and solid-state quantum repeaters.
- Received 6 December 2018
DOI:https://doi.org/10.1103/PhysRevLett.122.113602
© 2019 American Physical Society
Physics Subject Headings (PhySH)
Synopsis
Entangled Photon Source Ticks All Boxes
Published 22 March 2019
A quantum-dot-based device combines all of the attributes necessary for producing a reliable source of entangled photons for quantum information applications.
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