Berlin 2014 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 30: Poster: Photonics, laser development and applications, ultrashort laser pulses, quantum effects

Q 30.84: Poster

Dienstag, 18. März 2014, 16:30–18:30, Spree-Palais

Bipartite entanglement through a random media — •manutea candé — lpmmc, cnrs, Grenoble, France

In our theoretical work, we study quantum and classical aspects of two-photon interference in light transmission through disordered media. We show that disorder is the main factor that suppresses the interference, whatever the quantum state of the incident light. Secondarily, the two-photon interference is affected by the quantum nature of light (i.e., the well-defined number of photons in the two-photon entangled and Fock states as compared to the coherent state). And finally, entanglement is a resource that allows one to prepare two-photon states with special symmetries with respect to the interchange of the photons and, in particular, the states with bosonic and fermionic symmetries.

We are also interested in the quantification of the entanglement after the propagation through the disorder. Because the amount of entanglement can be related to the Schmidt decomposition of the state, we are using random matrix theory and statistical physics to get access to the distribution of the eigenvalues of the reduced density matrix. The first results we obtain show a strong dependence of the entanglement entropy with the size of the transmission matrix. Properties of the output state are also related to the statistics of the random matrix used to describe the disordered media.