Dresden 2011 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 44: Quantum Optics of Solid State Photon Sources
Q 44.9: Vortrag
Donnerstag, 17. März 2011, 12:45–13:00, HSZ 02
Generation of entangled photon pairs from the polariton ground state in a switchable optical cavity — •Adrian Auer and Guido Burkard — Department of Physics, University of Konstanz, D-78457 Konstanz, Germany
Intersubband cavity polaritons are the fundamental excitations of a planar microcavity embedding a sequence of doped quantum wells [1]. They arise from the interaction of cavity photons with intersubband excitations in the quantum wells. The ground state of the system, the polariton vacuum, contains a finite number of photons and, moreover, correlations of two photons having opposite in-plane wave vectors. It was proposed that these photons can be released by a non-adiabatic tuning of the light-matter interaction [1,2]. We theoretically investigate the polariton vacuum state in order to determine the entanglement between two photons, where we restrict our analysis to only two different modes. This could be carried out experimentally by a post-selective measurement. In this case we find that there is some entanglement for photon pairs having exactly opposite in-plane wave vectors which we quantify by the concurrence C. The amount of entanglement depends on the frequency of each photon and can be as high as C=0.7 for experimentally reasonable values. The probability for a successful post-selection is determined to be on the order of 10−5.
[1] C. Ciuti, G. Bastard and I. Carusotto, Phys Rev. B 72, 115303 (2005).
[2] S. De Liberato, C. Ciuti and I. Carusotto, Phys. Rev. Lett. 98, 103602 (2007).