Hannover 2010 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 25: Quantum Information: Quantum Communication I
Q 25.8: Vortrag
Mittwoch, 10. März 2010, 12:15–12:30, E 214
Concentration of Phase Information — •Christian Müller1,2, Mario Usuga3,1, Christoffer Wittmann1,2, Petr Marek4, Radim Filip4, Ulrik L. Andersen3,1, Christoph Marquardt1,2, and Gerd Leuchs1,2 — 1Max Planck Institute for the Science of Light, Günther-Scharowsky-Str. 1, Bau 24, 91058 Erlangen, Germany — 2Institute of Optics, Information und Photonics, University of Erlangen-Nuremberg, Staudtstr. 7/B2, 91058 Erlangen, Germany — 3Department of Physics, Technical University of Denmark, Building 309, 2800 Kgs. Lyngby, Denmark — 4Department of Optics, Palacký University, 17. Listopadu 50, Olomuc 77200, Czech Republic
The phase of coherent states is a degree of freedom that plays an important role in the field of quantum information and communication. The accessible phase information suffers under the influence of attenuation and it is hence desirable to be able to amplify phase information. Linear amplifiers fail to fulfill this task [1], so that more sophisticated schemes are needed . Previous proposals [2] had the drawback of relying on single photon sources and high interferometric stability, making implementation hardly feasible. We show in theory [3] and experiment, that a novel probabilistic scheme is capable of increasing the phase information. It is based purely on the addition of thermal noise and subsequent heralding, conditioned on the result of a photon number resolving detector.
[1] H.A. Haus and J.A. Mullen Phys. Rev. 128.2407 (1962)
[2] T.C. Ralph and A.B. Lund (2008) arXiv:0809.0326 [quant-ph]
[3] P. Marek and R. Filip (2009) arXiv:0907.2402[quant-ph]