Berlin 2001 – scientific programme

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Q: Quantenoptik

Q 15: Quantum Information IV

Q 15.1: Talk

Tuesday, April 3, 2001, 17:30–17:45, H 3010

Continuous variable polarization entanglement and entanglement of field quadratures: definition, generation and experimental characterization — •Natalia Korolkova, Christine Silberhorn, Rodney Loudon, Timothy C. Ralph, Friedrich König, and Gerd Leuchs — Zentrum für Moderne Optik, Universität Erlangen-Nürnberg, Staudtstr. 7/B2, D-91058 Erlangen, Germany

Continuous variable polarization entanglement is related to the quantum correlations of the uncertainties of quantum Stokes operators which determine a polarization of a quantum state. This type of entanglement can be generated by linear interference of two polarization squeezed beams in analogy to the successful interference scheme for bright EPR-entanglement of amplitude and phase [1]. Polarization squeezing implies the reduction of an uncertainty of one of the Stokes operators below that of the coherent light at the cost of growing uncertainty in other Stokes parameters. The important advantage is the possibility to determine fully experimentally the relevant conjugate variables of a polarization-squeezed or a polarization-entangled field in direct detection only, using linear optical elements. Towards the experimental quantum communication, we consider an experimental characterization of continuous variable entanglement: polarization entanglement and entanglement of field quadratures. The notions of squeezed-state, EPR-, and QND-entanglement are introduced and their mutual relations are discussed.

[1] Ch. Silberhorn et al No-dqGeneration of continuous variable Einstein-Podolsky-Rosen entanglement via the Kerr nonlinearity in an optical fibre,No-dq submitted (2000).