Triggered polarization-entangled photon pairs from a single quantum dot up to 30 K
By R. Hafenbrak, S. M. Ulrich, P. Michler, Lijuan Wang, A. Rastelli, O. Schmidt. 2007
206 citations recorded by the source corpus.
The radiative biexciton–exciton decay in a semiconductor quantum dot (QD) has the potential of being a source of triggered polarization-entangled photon pairs. However, in most cases the anisotropy-induced exciton fine structure splitting destroys this entanglement. Here, we present measurements on improved QD structures, providing both significantly reduced inhomogeneous emission linewidths and near-zero fine structure splittings. A high-resolution detection technique is introduced which allows us to accurately determine the fine structure in the photoluminescence emission and therefore select appropriate QDs for quantum state tomography. We were able to verify the conditions of entangled or classically correlated photon pairs in full consistence with observed fine structure properties. Furthermore, we demonstrate reliable polarization-entanglement for elevated temperatures up to 30 K. The fidelity of the maximally entangled state decreases only a little from 72% at 4 K to 68% at 30 K. This is especially encouraging for future implementations in practical devices.
Subfields: Artificial Intelligence, Atomic and Molecular Physics, and Optics
View Paper: https://www.semanticscholar.org/paper/4c20c94ac565d525f8ae628fa8d05cb720172cb9
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In Artificial Intelligence
In Atomic and Molecular Physics, and Optics
Citations in the corpus
- Electric-field-induced coherent coupling of the exciton states in a single quantum dot (2010, background): “When the FSS is smaller than the linewidth, the biexcitonto-exciton-to-empty cascade can lead to the emission of polarisation-entangled photon-pairs [9, 10], which has motivated much work on this subject.”
- Optical Properties of Semiconductor Quantum Dots (2008, background): “Self-assembled quantum dots (QDs) proved an excellent system for the implementation of quantum bits [91, 94, 95] and as sources of single [9, 96] and entangled photons [10, 97, 98].”
- Retraction Note: Polarization-entangled photons produced with high-symmetry site-controlled quantum dots (2009, background): “Several other tests for entanglement have been proposed in the literatur”