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Q: Fachverband Quantenoptik und Photonik

Q 56: Poster IV

Q 56.49: Poster

Donnerstag, 5. März 2009, 16:30–19:00, VMP 9 Poster

Deterministic entanglement of ions in thermal states of motion — •Florian Zähringer^1,2, Gerhard Kirchmair^1,2, René Gerritsma^1,2, Jan Benhelm^1,2, Christian Roos^1,2, and Rainer Blatt^1,2 — ¹Institut für Experimentalphysik, Universität Innsbruck, Österreich — ²Institut für Quantenoptik und Quanteninformation, Österreichische Akademie der Wissenschaften, Innsbruck, Österreich

We present an implementation of a Mølmer-Sørensen gate entangling ⁴⁰Ca⁺ ions using a bichromatic laser beam near-resonant with a quadrupole transition [1,2]. By amplitude pulse shaping and compensation of AC-Stark shifts we achieve a fast gate operation without compromising the error rate. In principle, the entangling gate does not require ground state cooling of the ions as long as the Lamb-Dicke criterion is fulfilled. We present the first experimental evidence for this claim and create Bell states with a fidelity of 0.974(1) for ions in a thermal state of motion with a mean phonon number of n=20(2) in the mode coupling to the ions’ internal states.

[1] J. Benhelm, G. Kirchmair, C. F. Roos and R. Blatt, Nat. Phys. 4, 463 (2008)

[2] G. Kirchmair, J. Benhelm, F. Zähringer, R. Gerritsma, C. F. Roos and R. Blatt, arXiv:physics/0810.0670v1