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Q: Fachverband Quantenoptik und Photonik

Q 52: Quanteninformation: Quantenkommunikation II

Q 52.7: Vortrag

Donnerstag, 5. März 2009, 18:00–18:15, Audi-B

Optimizing Gaussian communication for hybrid quantum repeater — •Ludmila Praxmeyer and Peter van Loock — OQI Group, Max Planck Research Group, Institute of Optics, Information and Photonics, University Erlangen-Nuremberg

For long distance quantum communication, distribution of entanglement over large distances, overcoming effects of noise and decoherence, is needed. Various quantum repeater schemes [1] were proposed to provide a theoretical solution to this problem. We shall present an optimized version of the hybrid quantum repeater [2,3], based on Gaussian optical-state communication and Gaussian, homodyne-based, conditional entangled state preparation. We show that use of squeezed light significantly increases the fidelity of states obtained while probability of success is aintained. We also show that hybrid entanglement swapping [4] between squeezed states of light and atoms in the cavity makes scheme [2] more practical compared to the case when entanglement swapping is performed solely on the level of the atoms.

References:

[1] H.-J. Briegel et al., Phys. Rev. Lett. 81, 5932 (1998),

[2] P. van Loock et al., Phys. Rev. Lett. 96, 240501 (2006),

[3] T. D. Ladd et al., New J. Phys. 8, 164 (2006),

[4] P. van Loock et al., Phys. Rev. A 78, 062319 (2008).