Hannover 2010 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 25: Quantum Information: Quantum Communication I

Q 25.7: Talk

Wednesday, March 10, 2010, 12:00–12:15, E 214

Experimental results for quantum state discimination — •Gesine Steudle, Sebastian Knauer, Ulrike Herzog, and Oliver Benson — Humboldt-Universität zu Berlin, Institut für Physik, AG Nano-Optik

The discrimination of quantum states [1,2 ] is a fundamental part of quantum communication and quantum crytography. Particularly, the discrimination of two non-orthogonal quantum states can performed unambiguously only at the expense of admitting inconclusive results. In this contribution we present an experimental setup for optimal unambiguous discrimination between two non-orthogonal mixed states [3,4]. We show experimental results of state discrimination on the single photon level. A first approach utilizes attenuated light from a laser light source whereas a second approach will implement a true single photon source. The latter is based on Stranski-Krastanow-grown InAs dots which are embedded in a pin-junction to establish electrical pumping [5].

[1] J. A. Bergou et al., Lect. Notes Phys. 649, 417 (2004)

[2] S. M. Barnett and S. Croke, Adv. Opt. Photon. 1, 238 (2009)

[3] U. Herzog, Phys. Rev. A 75, 052309 (2007)

[4] U. Herzog and O. Benson, J. Mod. Opt. 56, 1362 (2009)

[5] A. Lochmann et al., Electron. Lett. 42, 774 (2006)