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Direct Excitation of a Single Quantum Dot with Cavity-SPDC Photons

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posted on 2023-11-30, 06:45 authored by Uttam Paudel, Jia Jun Wong, Michael Goggin, Paul Kwiat, Allan S. Bracker, Michael Yakes, Daniel Gammon, Duncan Steel
The ability to generate mode-engineered single photons to interface with disparate quantum systems is of importance for building a quantum network. Here we report on the generation of a pulsed, heralded single photon source with a sub-GHz spectral bandwidth that couples to indium arsenide quantum dots centered at 942 nm. The source is built with a type-II PPKTP down-conversion crystal embedded in a semi-confocal optical cavity and pumped with a 76 MHz repetition rate pulsed laser to emit collinear, polarization-correlated photon pairs resonant with a single quantum dot. In order to demonstrate direct coupling, we use the mode-engineered cavity-SPDC single-photon source to resonantly excite an isolated single quantum dot.

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