A bright and fast source of coherent single photons
- URL: http://arxiv.org/abs/2007.12654v1
- Date: Fri, 24 Jul 2020 17:08:46 GMT
- Title: A bright and fast source of coherent single photons
- Authors: Natasha Tomm, Alisa Javadi, Nadia O. Antoniadis, Daniel Najer,
Matthias C. L\"obl, Alexander R. Korsch, R\"udiger Schott, Sascha R.
Valentin, Andreas D. Wieck, Arne Ludwig, Richard J. Warburton
- Abstract summary: A single photon source is a key enabling technology in device-independent quantum communication.
We report a single photon source with an especially high system efficiency.
- Score: 46.25143811066789
- License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
- Abstract: A single photon source is a key enabling technology in device-independent
quantum communication, quantum simulation for instance boson sampling, linear
optics-based and measurement-based quantum computing. These applications
involve many photons and therefore place stringent requirements on the
efficiency of single photon creation. The scaling on efficiency is an
exponential function of the number of photons. Schemes taking full advantage of
quantum superpositions also depend sensitively on the coherence of the photons,
i.e. their indistinguishability. It is therefore crucial to maintain the
coherence over long strings of photons. Here, we report a single photon source
with an especially high system efficiency: a photon is created on-demand at the
output of the final optical fibre with a probability of 57%. The coherence of
the photons is very high and is maintained over a stream consisting of
thousands of photons; the repetition rate is in the GHz regime. We break with
the established semiconductor paradigms, such as micropillars, photonic crystal
cavities and waveguides. Instead, we employ gated quantum dots in an open,
tunable microcavity. The gating ensures low-noise operation; the tunability
compensates for the lack of control in quantum dot position and emission
frequency; the output is very well-matched to a single-mode fibre. An increase
in efficiency over the state-of-the-art by more than a factor of two, as
reported here, will result in an enormous decrease in run-times, by a factor of
$10^{7}$ for 20 photons.
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