Heidelberg 2015 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 31: Poster: Quantum Optics and Photonics II

Q 31.44: Poster

Dienstag, 24. März 2015, 17:00–19:00, C/Foyer

Atomic Bell-state projection assisted by multiphoton coherent states — •Juan Mauricio Torres, József Zsolt Bernád, and Gernot Alber — Institut für Angewandte Physik, Technische Universität Darmstadt, D-64289 Darmstadt, Germany

We present a postselective Bell-state projection which is capable of projecting two material qubits onto a Bell state with the help of ancillary coherent multiphoton states and postselection by balanced homodyne photodetection [1]. This photon-assisted Bell projection is generated by coupling almost resonantly the two material qubits to single modes of the radiation field in two separate cavities in a Ramsey-type interaction sequence and by measuring the emerged field states in a balanced homodyne detection scenario. We include in our analysis the case of different coupling strengths of the two material qubits to the radiation field and how this affects the performance of our protocol. Provided this photonic postselection is successful we explore the theoretical possibilities of realizing unit fidelity quantum teleportation and entanglement swapping with 25% success probability.

[1] J.M. Torres, J.Z. Bernád and G. Alber, Phys. Rev. A 90, 012304 (2014)