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Conference on Lasers and Electro-Optics

A single photon source based on a single Ca+ ion

Christoph Becher, Christian Maurer, Carlos Russo, Christian F. Roos, Jürgen Eschner, Ferdinand Schmidt‐Kaler, R. Blatt

Published Jan 1, 2004• 3 citations
Publisher

Abstract

We propose a source of single photons based on the stimulated Raman transition of a single Ca+ ion trapped inside a high finesse optical cavity. Assuming realistic experimental parameters the photon emission efficiency reaches 95%.
DOI
10.1364/iqec.2004.ithg2

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We present a single calcium ion, coupled to a high-finesse cavity, as an almost ideal system for the controlled generation of single photons. Photons from a pump beam are Raman-scattered by the ion into the cavity mode, which subsequently emits the photon into a well-defined output channel. In contrast with comparable atomic systems, the ion is localized at a fixed position in the cavity mode for indefinite times, enabling truly continuous operation of the device. We have performed numeric calculations to assess the performance of the system and present the first experimental indication of single-photon emission in our set-up.
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A single rubidium atom trapped within a high-finesse optical cavity is an efficient source of single photons. We theoretically and experimentally study single-photon generation using a vacuum stimulated Raman adiabatic passage. We experimentally achieve photon generation efficiencies of up to 34% and 56% on the D1{D}_{1}D1​ and D2{D}_{2}D2​ line, respectively. Output coupling with 89% results in record-high efficiencies for single photons in one spatiotemporally well-defined propagating mode. We demonstrate that the observed generation efficiencies are constant in a wide range of applied pump laser powers and virtual level detunings. This allows for independent control over the frequency and wave packet envelope of the photons without loss in efficiency. In combination with the long trapping time of the atom in the cavity, our system constitutes a significant advancement toward an on-demand, highly efficient single-photon source for quantum information processing tasks.