Indistinguishable and efficient single photons from a quantum dot in a planar nanobeam waveguide

Title
Indistinguishable and efficient single photons from a quantum dot in a planar nanobeam waveguide
Authors
송진동박석인Gabija KirsanskeHenri ThyrrestrupRaphael S. DaveauChris L. DreeBenTommaso PregnolatoLeonardo MidoloPetru TighineanuAlisa JavadiSøren StobbeRudiger SchottArne LudwigAndreas D. WieckAndreas V. KuhlmannImmo SollnerMatthias C. LoblRichard J. WarburtonPeter Lodahl
Keywords
Indistinguishable; Single photon; InAs; Quantum dots
Issue Date
2017-10
Publisher
Physical review B, Condensed matter and materials physics
Citation
VOL 96, NO 16-165306-11
Abstract
We demonstrate a high-purity source of indistinguishable single photons using a quantum dot embedded in a nanophotonic waveguide. The source features a near-unity internal coupling efficiency and the collected photons are efficiently coupled off chip by implementing a taper that adiabatically couples the photons to an optical fiber. By quasiresonant excitation of the quantum dot, we measure a single-photon purity larger than 99.4% and a photon indistinguishability of up to 94 +/- 1% by using p-shell excitation combinedwith spectral filtering to reduce photon jitter. A temperature-dependent study allows pinpointing the residual decoherence processes, notably the effect of phonon broadening. Strict resonant excitation is implemented as well as another means of suppressing photon jitter, and the additional complexity of suppressing the excitation laser source is addressed. The paper opens a clear pathway towards the long-standing goal of a fully deterministic source of indistinguishable photons, which is integrated on a planar photonic chip.
URI
http://pubs.kist.re.kr/handle/201004/66535
ISSN
2469-9950
Appears in Collections:
KIST Publication > Article
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