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SYQR: Symposium Quantum Repeater

SYQR 1: Flying/Stationary Qubit Conversion and Entanglement Generation

SYQR 1.5: Vortrag

Montag, 17. März 2014, 11:30–11:45, UDL HS2002

Double-heralded single-photon absorption by a single atom — •José Brito, Stephan Kucera, Pascal Eich, Michael Schug, Christoph Kurz, Philipp Müller, Jan Huwer, and Jürgen Eschner — Experimentalphysik, Universität des Saarlandes, Saarbrücken, Germany

We present a single-photon single-atom interface experiment, where a heralded single photon generated by Spontaneous Parametric Down Conversion (SPDC) is absorbed by a single atom, generating a single blue (393 nm) photon in an anti-Stokes Raman process [1].

The SPDC photon-pair source [2] is stabilized and tuned to match resonantly the D_5/2–P_3/2 atomic transition of ⁴⁰Ca⁺ at 854 nm [3, 4].

A single ⁴⁰Ca⁺ ion is trapped in a linear Paul trap and prepared for the absorption of these photons by coherent excitation from the S_1/2 ground state to the metastable D_5/2 state. We correlate the detection of the partner photon that heralds the 854 nm SPDC photon with the blue Raman photon that heralds the absorption event. Furthermore, we explore the subsequent frequency conversion of the SPDC herald to the telecom band.

[1] C. Kurz et al., New J. Phys. 15, 055005 (2013)

[2] N. Piro et al., J. Phys. B 42, 114002 (2009)

[3] N. Piro et al., Nat. Phys. 7, 17 (2011)

[4] J. Huwer et al., New J. Phys. 15, 025033 (2013)