Hannover 2016 – scientific programme
Parts | Days | Selection | Search | Updates | Downloads | Help
Q: Fachverband Quantenoptik und Photonik
Q 47: Quantum Information: Quantum Computing and Communication I
Q 47.5: Talk
Thursday, March 3, 2016, 12:00–12:15, e214
Programmable atom-photon quantum interface — •Pascal Eich, Christoph Kurz, Michael Schug, Philipp Müller, Matthias Kreis, and Jürgen Eschner — Experimentalphysik, Universität des Saarlandes, Saarbrücken, Germany
We report on the implementation of a programmable atom-photon quantum interface, employing a single trapped 40Ca+ ion and single photons. Depending on its mode of operation, the interface serves as a bi-directional atom-photon quantum-state converter [1,2], as a source of entangled atom-photon states, or as a quantum frequency converter of single photons. The interface lends itself particularly to interfacing ions with SPDC-based single-photon sources or entangled-photon-pair sources [3,4]. In the experimental procedure, we generate an initial superposition state in the meta-stable D5/2 level of the ion, using a narrow-band laser at 729 nm. Upon the absorption of a single photon at 854 nm, the ion undergoes a Raman transition to its S1/2 ground state, emitting a single photon at 393 nm. The coherent evolution from the initial to the final quantum state of atomic superposition and photon polarization is utilized for the interface protocol.
[1] P. Müller, J. Eschner, Appl. Phys. B 114, 303 (2014).
[2] C. Kurz et al., Nat. Commun. 5, 5527 (2014).
[3] A. Lenhard et al., arXiv:1504.08303, to appear in Phys. Rev. A.
[4] J. Brito et al., arXiv:1508.01029, to appear in Appl. Phys. B.