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High Purcell factor generation of indistinguishable on-chip single photons

Liu, Feng; Brash, Alistair J.; O’Hara, John; Martins, Luis M.P.P.; Phillips, Catherine L.; Coles, Rikki J.; Royall, Benjamin; Clarke, Edmund; Bentham, Christopher; Prtljaga, Nikola; Itskevich, Igor E.; Wilson, Luke R.; Skolnick, Maurice S.; Fox, A. Mark


Feng Liu

Alistair J. Brash

John O’Hara

Luis M.P.P. Martins

Catherine L. Phillips

Rikki J. Coles

Benjamin Royall

Edmund Clarke

Christopher Bentham

Nikola Prtljaga

Igor E. Itskevich

Luke R. Wilson

Maurice S. Skolnick

A. Mark Fox


On-chip single-photon sources are key components for integrated photonic quantum technologies. Semiconductor quantum dots can exhibit near-ideal single-photon emission, but this can be significantly degraded in on-chip geometries owing to nearby etched surfaces. A long-proposed solution to improve the indistinguishablility is to use the Purcell effect to reduce the radiative lifetime. However, until now only modest Purcell enhancements have been observed. Here we use pulsed resonant excitation to eliminate slow relaxation paths, revealing a highly Purcell-shortened radiative lifetime (22.7 ps) in a waveguide-coupled quantum dot–photonic crystal cavity system. This leads to near-lifetime-limited single-photon emission that retains high indistinguishablility (93.9%) on a timescale in which 20 photons may be emitted. Nearly background-free pulsed resonance fluorescence is achieved under π-pulse excitation, enabling demonstration of an on-chip, on-demand single-photon source with very high potential repetition rates.


Liu, F., Brash, A. J., O’Hara, J., Martins, L. M., Phillips, C. L., Coles, R. J., …Fox, A. M. (2018). High Purcell factor generation of indistinguishable on-chip single photons. Nature nanotechnology, 13(9), 835-840.

Journal Article Type Article
Acceptance Date Jun 7, 2018
Online Publication Date Jul 16, 2018
Publication Date Sep 1, 2018
Deposit Date Aug 17, 2018
Publicly Available Date Jan 17, 2019
Journal Nature Nanotechnology
Print ISSN 1748-3387
Electronic ISSN 1748-3395
Publisher Nature Publishing Group
Peer Reviewed Peer Reviewed
Volume 13
Issue 9
Pages 835-840
Keywords Electrical and Electronic Engineering; Atomic and Molecular Physics, and Optics; Condensed Matter Physics;
Public URL
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