Temperature-independent almost perfect photon entanglement from quantum dots via the SUPER scheme

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 can be overcome by now, the excitation scheme itself can impair the entanglement fidelity. Here, we demonstrate that the swing-up of quantum emitter population (SUPER) scheme applied to a quantum dot in a cavity yields almost perfectly entangled photons. The entanglement degree 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 about $80$K.

4 pages, 4 figures + appendix

References in corpus (7)

• QuTiP 2: A Python framework for the dynamics of open quantum systems
• On-demand semiconductor source of entangled photons which simultaneously has high fidelity, efficiency, and indistinguishability
• Electric-field-induced coherent coupling of the exciton states in a single quantum dot
• Coherence of an Entangled Exciton-Photon State
• Highly entangled photons from hybrid piezoelectric-semiconductor quantum dot devices
• From strong to weak temperature dependence of the two-photon entanglement resulting from the biexciton cascade inside a cavity
• Coherent Dynamics of the Swing-Up Excitation Technique

Cited by in corpus (6)

• ACE: A general-purpose non-Markovian open quantum systems simulation toolkit based on process tensors
• Understanding and utilizing the inner bonds of process tensors
• Hybrid acousto-optical swing-up state control in a quantum dot
• Quantum-dot single photon source performance with off-resonant pulse preparation schemes
• Selective Preparation of Collective States in Coupled Quantum Emitters Using the SUPER Excitation Scheme
• Robust biexciton preparation for entangled photon-pair generation by single-shot Floquet driving