Optical feedback-enhanced photon entanglement from a biexciton cascade

In a solid-state platform for quantum information science, the biexciton cascade is an important source of entangled photons. However, the entanglement is usually reduced considerably by the fine-structure splitting of the exciton levels. We show how to counteract this loss of entanglement by applyi...

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Veröffentlicht in:Physical review letters 2014-07, Vol.113 (2), p.027401-027401, Article 027401
Hauptverfasser: Hein, Sven M, Schulze, Franz, Carmele, Alexander, Knorr, Andreas
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Schulze, Franz
Carmele, Alexander
Knorr, Andreas
description In a solid-state platform for quantum information science, the biexciton cascade is an important source of entangled photons. However, the entanglement is usually reduced considerably by the fine-structure splitting of the exciton levels. We show how to counteract this loss of entanglement by applying optical feedback. Substantial control and enhancement of photon entanglement can be achieved by coherently feeding back a part of the emitted signal, e.g., by a mirror, and by tuning the feedback phase and delay time. We present full quantum-mechanical calculations, which include the external photon mode continuum, and discuss the mechanisms leading to the above effects.
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subjects Cascades
Delay
Entanglement
Feeding
Mathematical analysis
Optical feedback
Photons
Tuning
title Optical feedback-enhanced photon entanglement from a biexciton cascade
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