Two-photon interference from remote GaAs quantum dots A prospect towards deterministic multi-photon applications on-demand

Description

Photonic quantum technologies are on the verge of finding applications in everyday life with quantum cryptography and the quantum internet on the horizon. Single epitaxial quantum dots are emerging as near-optimal sources [1] of bright [2], on-demand, highly indistinguishable single photons [3] and entangled photon pairs [4]. In order to build up quantum networks, it is now essential to interface remote quantum emitters. However, this is still an outstanding challenge, as the states of dissimilar quantum dots have to be prepared on-demand with high fidelity, and the generated photons have to be made indistinguishable [5]. Here, we overcome this major obstacle and show an unprecedented two-photon interference (visibility of 51±5%) from remote strain-tunable GaAs quantum dots emitting on-demand photon-pairs. We achieve this result by exploiting the full potential of the novel phonon-assisted two-photon excitation scheme [6], which allows for the generation of highly indistinguishable (visibility of 71±9%) entangled photon-pairs (fidelity of 98±0.5%), it enables push-to button biexciton state preparation (fidelity of 80±2%) and it outperforms conventional resonant two-photon excitation schemes in terms of robustness against environmental decoherence. It allows us to perform a quantum teleportation experiment [7] from one quantum dot (fidelity of 72±1%), laying the foundation for teleporting with two remote quantum dots. Our results mark an important milestone for the practical realization of quantum repeaters and complex multi-photon entanglement experiments involving dissimilar quantum dots.

Period	25 Jun 2018
Event title	10th International Conference on Quantum Dots (QD 2018)
Event type	Conference
Location	CanadaShow on map