Heidelberg 2015 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 59: Quantum Information: Quantum Communication I
Q 59.2: Vortrag
Donnerstag, 26. März 2015, 15:00–15:15, K/HS1
Protocols for a quantum network based on single photons — •Susanne Blum1, Christopher O’Brien2, Daniel Reich3, Nikolai Lauk4, Christiane Koch3, Michael Fleischhauer4, and Giovanna Morigi1 — 1Universität des Saarlandes, Saarbrücken, Germany — 2Texas A & M University, College Station, USA — 3Universität Kassel, Kassel, Germany — 4TU Kaiserslautern, Kaiserslautern, Germany
Two protocols for interfacing single optical photons with individual qubits are theoretically discussed. The first is a protocol which allows one to interface a single optical photon with a superconducting qubit. It makes use of a a spin ensemble, where the individual emitters possess both an optical and a magnetic dipole transition. Reversible frequency conversion is realized by combining optical photon storage, for instance by means of EIT, with the controlled switching on and off the coupling of the magnetic dipole transition with a microwave cavity, which in turn couples to a superconducting qubit. We test various strategies and compare their efficiencies in terms of robustness and transfer time. The second protocol aims at achieving perfect absorption of a photon by a single trapped atom, or solid-state emitter, by means of optimal control theory. We make use of the Krotov algorithm for the purpose of identifying pulses driving the atom, that maximize the efficiency and fidelity of absorption in the setup of [Reiser et al., Nature 508, 237 (2014)]. These protocols contribute to the development of a toolbox for quantum networks using hybrid platforms.