Berlin 2014 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 13: Quantum information: Atoms and ions II

Q 13.3: Talk

Monday, March 17, 2014, 14:45–15:00, UDL HS3038

A quantum gate between a flying optical photon and a single trapped atom — •Norbert Kalb, Andreas Reiserer, Bastian Hacker, Mahmood Sabooni, Stephan Ritter, and Gerhard Rempe — Max-Planck-Institut für Quantenoptik, Hans-Kopfermann-Str. 1, 85478 Garching

The steady increase in control over individual quantum systems has led to the dream of a quantum technology that provides functionality beyond any classical device. Over the past decade, two major directions have been extensively studied. First, the use of flying optical photons for secure quantum communication over large distances. Second, the use of atomic spins for quantum computation. While each of the individual systems has its own advantages, a hybrid system might be required to achieve scalability.

Here we present a hybrid two-qubit gate between the spin state of a single atom and the polarization state of a photon. To this end, an ⁸⁷Rb atom is trapped at the centre of an optical cavity in the strong-coupling regime. The gate is performed by reflecting a resonant photon off the cavity. We will present results characterizing the gate, e.g. by the production of atom-photon entangled states from separable input states.