Affiliation:
1. Condensed Matter Theory
2. Heriot-Watt University
3. Universität Bayreuth
Abstract
Entangled photon pairs are essential for quantum communication
technology. They can be generated on-demand by semiconductor quantum
dots, but several mechanisms are known to reduce the degree of
entanglement. While some obstacles like the finite fine-structure
splitting of the exciton states can currently be overcome, the
excitation scheme itself can impair the entanglement fidelity. Here,
we demonstrate that the swing-up of quantum emitter population (SUPER)
scheme, using two red-detuned laser pulses applied to a quantum dot in
a cavity, yields almost perfectly entangled photons. The entanglement
remains robust against phonon influences even at elevated
temperatures, due to decoupling of the excitation and emission
process. With this achievement, quantum dots are ready to be used as
entangled photon pair sources in applications requiring high degrees
of entanglement up to temperatures of approximately 80 K.
Funder
Deutsche
Forschungsgemeinschaft
Cited by
1 articles.
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