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16 March 2015 Photon pairs from a biexciton cascade with feedback-controlled polarization entanglement
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We propose to use a time-delayed quantum-coherent feedback mechanism to increase and control the entanglement of photon pairs emitted by a quantum dot biexciton cascade. The quantum dot biexciton cascade is a well-known source of entangled photons on demand, however excitonic fine-structure splitting decreases the achievable polarization entanglement. We demonstrate that feedback can change the spectrum of the emitted photons in a way that the entanglement is either strongly increased or decreased, depending on the feedback time and phase. We analyze the dependence on parameters such as the delay time and the robustness of the proposed mechanism.
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Sven M. Hein, Franz Schulze, Alexander Carmele, and Andreas Knorr "Photon pairs from a biexciton cascade with feedback-controlled polarization entanglement", Proc. SPIE 9357, Physics and Simulation of Optoelectronic Devices XXIII, 93570W (16 March 2015);

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