Data from the manuscript "High Purcell factor generation of coherent on-chip single photons".
Abstract:
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 by
using 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 which 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.
Funding
EPSRC (UK) Programme Grants EP/J007544/1 and EP/N031776/1