Dresden 2011 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 23: Poster 2: Intersectional Session

Q 23.19: Poster

Tuesday, March 15, 2011, 18:00–21:00, P1

Laser-Assisted Bell Measurements and Spontaneous Decay Processes — •Jozsef Zsolt Bernad and Gernot Alber — Institut für Angewandte Physik, Technische Universität Darmstadt, D-64289 Darmstadt

Following the original suggestion of Briegel et al. [1] recently also alternative theoretical proposals of quantum repeaters have been developed in which the Bell-measurements required are implemented by different physical processes. The recent proposal for a quantum repeater based on continuous variables by van Loock et al. [2,3], for example, is based on Bell measurements which are performed with the help of off-resonant laser-induced couplings in the relevant material qubits. In this contribution the resulting realistic effects of spontaneous decay of the excited qubits are investigated and their influence on the quality of Bell measurements is explored. It constitutes a first step towards the development of appropriate error suppression methods which counteract the entanglement breaking tendencies of spontaneous decay processes.

[1] H. J. Briegel, W. Dür, J. I. Cirac, P. Zoller, Phys. Rev. Lett. 81, 5932 (1998).

[2]P. van Loock, T. D. Ladd, K. Sanaka, F. Yamaguchi, K. Nemoto, W. J. Munro, and Y. Yamamoto, Phys. Rev. Lett. 96, 240501 (2006).

[3]P. van Loock, N. Lütkenhaus, W. J. Munro, and K. Nemoto, Phys. Rev. A 78, 062319 (2008).