Deterministic photon pairs and coherent optical control of a single quantum dot

Harishankar Jayakumar, Ana Predojević, Tobias Huber, Thomas Kauten, Glenn S. Solomon, Gregor Weihs

Research output: Contribution to journalArticlepeer-review

92 Scopus citations

Abstract

The strong confinement of semiconductor excitons in a quantum dot gives rise to atomlike behavior. The full benefit of such a structure is best observed in resonant excitation where the excited state can be deterministically populated and coherently manipulated. Because of the large refractive index and device geometry it remains challenging to observe resonantly excited emission that is free from laser scattering in III/V self-assembled quantum dots. Here we exploit the biexciton binding energy to create an extremely clean single photon source via two-photon resonant excitation of an InAs/GaAs quantum dot. We observe complete suppression of the excitation laser and multiphoton emissions. Additionally, we perform full coherent control of the ground-biexciton state qubit and observe an extended coherence time using an all-optical echo technique. The deterministic coherent photon pair creation makes this system suitable for the generation of time-bin entanglement and experiments on the interaction of photons from dissimilar sources.

Original languageEnglish (US)
Article number135505
JournalPhysical review letters
Volume110
Issue number13
DOIs
StatePublished - Mar 26 2013
Externally publishedYes

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