학술논문
A bright and fast source of coherent single photons.
Document Type
Academic Journal
Author
Tomm N; Department of Physics, University of Basel, Basel, Switzerland.; Javadi A; Department of Physics, University of Basel, Basel, Switzerland. alisa.javadi@unibas.ch.; Antoniadis NO; Department of Physics, University of Basel, Basel, Switzerland.; Najer D; Department of Physics, University of Basel, Basel, Switzerland.; Löbl MC; Department of Physics, University of Basel, Basel, Switzerland.; Korsch AR; Department of Physics, University of Basel, Basel, Switzerland.; Lehrstuhl für Angewandte Festkörperphysik, Ruhr-Universität Bochum, Bochum, Germany.; Schott R; Lehrstuhl für Angewandte Festkörperphysik, Ruhr-Universität Bochum, Bochum, Germany.; Valentin SR; Lehrstuhl für Angewandte Festkörperphysik, Ruhr-Universität Bochum, Bochum, Germany.; Wieck AD; Lehrstuhl für Angewandte Festkörperphysik, Ruhr-Universität Bochum, Bochum, Germany.; Ludwig A; Lehrstuhl für Angewandte Festkörperphysik, Ruhr-Universität Bochum, Bochum, Germany.; Warburton RJ; Department of Physics, University of Basel, Basel, Switzerland.
Source
Publisher: Nature Pub. Group Country of Publication: England NLM ID: 101283273 Publication Model: Print-Electronic Cited Medium: Internet ISSN: 1748-3395 (Electronic) Linking ISSN: 17483387 NLM ISO Abbreviation: Nat Nanotechnol Subsets: PubMed not MEDLINE; MEDLINE
Subject
Language
English
Abstract
A single-photon source is an enabling technology in device-independent quantum communication 1 , quantum simulation 2,3 , and linear optics-based 4 and measurement-based quantum computing 5 . These applications employ many photons and place stringent requirements on the efficiency of single-photon creation. The scaling on efficiency is typically an exponential function of the number of photons. Schemes taking full advantage of quantum superpositions also depend sensitively on the coherence of the photons, that is, their indistinguishability 6 . Here, we report a single-photon source with a high end-to-end efficiency. We employ gated quantum dots in an open, tunable microcavity 7 . The gating provides control of the charge and electrical tuning of the emission frequency; the high-quality material ensures low noise; and the tunability of the microcavity compensates for the lack of control in quantum dot position and emission frequency. Transmission through the top mirror is the dominant escape route for photons from the microcavity, and this output is well matched to a single-mode fibre. With this design, we can create a single photon at the output of the final optical fibre on-demand with a probability of up to 57% and with an average two-photon interference visibility of 97.5%. Coherence persists in trains of thousands of photons with single-photon creation at a repetition rate of 1 GHz.