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Quantum Information and Measurement (QIM)

High-resolution spectroscopy of deterministically generated single photons from a single atom

Matthias Kreis, Konstantin Klein, Jurek Frey, Christian Haen, Jürgen Eschner

Published Jan 1, 2019• 0 citations
Publisher

Abstract

Using a high-finesse optical Fabry-Perot cavity, we measure the spectrum of single 854-nm photons generated from a trapped single 40Ca+ -ion by controlled Raman scattering on the D5/2 - P3/2 - S1/2 transition.
DOI
10.1364/qim.2019.f5a.62

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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.
A sequence of single photons is emitted on demand from a single three-level atom strongly coupled to a high-finesse optical cavity. The photons are generated by an adiabatically driven stimulated Raman transition between two atomic ground states, with the vacuum field of the cavity stimulating one branch of the transition, and laser pulses deterministically driving the other branch. This process is unitary and therefore intrinsically reversible, which is essential for quantum communication and networking, and the photons should be appropriate for all-optical quantum information processing.