Energy-tunable sources of entangled photons: a viable concept for solid-state-based quantum relays

摘要

We propose a new method of generating triggered entangled photon pairs withwavelength on demand. The method uses a micro-structuredsemiconductor-piezoelectric device capable of dynamically reshaping theelectronic properties of self-assembled quantum dots (QDs) via anisotropicstrain-engineering. Theoretical models based on kp theory in combination withfinite-element calculations show that the energy of the polarization-entangledphotons emitted by QDs can be tuned in a range larger than 100 meV withoutaffecting the degree of entanglement of the quantum source. These results pavethe way towards the deterministic implementation of QD entanglement resourcesin all-electrically-controlled solid-state-based quantum relays.