Abstract

We develop high-efficiency single- and entangled-photons sources that simultaneously combine high purity, efficiency, and indistinguishability. We develop elliptical microcavities to boost the polarized single-photon extraction efficiency over 50%. We coherently excite a quantum dot with a dichromatic pulsed laser to circumvent the 50% loss issue in resonance fluorescence due to the polarization-extinction configuration. We directly observe intensity squeezing of 0.59 dB in resonance fluorescence, and a corrected squeezing of 3.29 dB at the first lens. Quantum interference between quantum-dot single photons and sunlight is also demonstrated in our experiments.

© 2020 The Author(s)