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Abstract
Spontaneous Raman processes in cold atoms have been widely used in the past decade for generating single photons. Here, we present a method to optimise their efficiencies for given atomic coherences and optical depths. We give a simple and complete recipe that can be used in present-day experiments, attaining near-optimal single photon emission.
Highlights
On-demand single photon sources are appealing ingredients for many quantum information tasks
Since all the interacting atoms participate in the process, and there is no information about which atom emitted the photon, the detection of this write photon heralds the existence of a single delocalised excitation across the sample – an atomic spin wave
Once the spin wave has been prepared, the atomic sample is ready to be used as a source, and a second pulse – the read control field – along the second transition performs a conversion of the atomic spin wave into a second photon – the read photon field
Summary
On-demand single photon sources are appealing ingredients for many quantum information tasks. If the duration of the process is short enough with respect to the atomic coherence times, and the optical depth of the sample sufficiently high, the read photon is emitted efficiently in a well defined mode and the protocol provides a viable single photon source Such sources have been at the core of numerous experiments during the last decade following the seminal paper of Duan, Lukin, Cirac and Zoller [3], showing how they could be used for long-distance quantum communication based on quantum repeater architectures (for reviews, see [4,5,6,7]). We include a feasibility study in the case of a gas of Rubidium-87
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