Heidelberg 2015 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 31: Poster: Quantum Optics and Photonics II
Q 31.43: Poster
Tuesday, March 24, 2015, 17:00–19:00, C/Foyer
Interference and diagnosis of imperfect bosons — •Malte C. Tichy1, Young-Sik Ra2, Hyang-Tag Lim2, Clemens Gneiting3, Yoon-Ho Kim2, and Klaus Mølmer1 — 1Department of Physics and Astronomy, University of Aarhus, Denmark — 2Department of Physics, Pohang University of Science and Technology, Pohang, Korea — 3Physikalisches Institut der Albert-Ludwigs-Universität, Freiburg, Germany
We study the many-body interference of imperfect (partially distinguishable, dephased or mixed) bosons in multi-mode networks using double-sided Feynman diagrams. The many-particle event probability becomes a multi-dimensional tensor-permanent [1], which interpolates between distinguishable particles and ideal identical bosons. The strength of interference is quantified by the permanent of the distinguishability matrix, which is composed of all mutual scalar products of the single-particle mode-functions. Based on this method, we develop a protocol for the differential diagnosis of decoherence processes in interferometers and for the precise characterization of few-photon states [2]. Double-Fock-superpositions of the form (|N,M ⟩+|M,N⟩)/√2 are shown to provide versatile and powerful tools that combine the phase-super-sensitivity of N00N-state with bosonic bunching, which allows detailed insight into decoherence processes in a single experiment.
[1] M.C. Tichy, arXiv:1410.7687
[2] M.C. Tichy, Y.-S. Ra, H.-T. Lim, C. Gneiting, Y.-H. Kim, K. Mølmer, arXiv:1410.1299