Stuttgart 2012 – wissenschaftliches Programm
Q 35.85: Poster
Mittwoch, 14. März 2012, 16:30–19:00, Poster.I+II
Characterization of continuous variable entangled states with photon counting — •Georg Harder1, Kaisa Laiho2, and Christine Silberhorn1 — 1Integrated Quantum Optics, Applied Physics, University of Paderborn, D-33098 Paderborn — 2MPI for the Science of Light, Erlangen, Germany
Quantum state characterization is essential for applications in quantum optics and quantum communication. The standard technique, homodyne detection, measures field quadratures and relies on tomographic reconstruction of the Wigner function to yield complete information about the state. Hereby, the Heisenberg uncertainty principle precludes simultaneous measurement of non commuting variables. An alternative approach, photon counting, measures photon number probabilities from which the value of the Wigner function at single points in phase space can be deduced. Utilizing photon counting, we propose and implement a scheme that allows for the characterization of entanglement between CV entangled states without phase reference. Omitting phase stabilization in an experimental setup significantly simplifies its realization.