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HL: Fachverband Halbleiterphysik

HL 65: Quantum Optics on the Nanoscale: From Fundamental Physics to Quantum Technologies (joined session, HL, DS, O, TT, organized by HL)

HL 65.1: Hauptvortrag

Donnerstag, 23. März 2017, 09:30–10:00, HSZ 02

Quantum dot based quantum technologies — •Pascale Senellart — CNRS - Université Paris-Saclay, 91460 Marcoussis, France

Scaling optical quantum technologies requires efficient single photon sources and two-photon gates. Such devices can be obtained using artificial atoms like semiconductor quantum dots (QDs). Yet, an ideal atom-photon interface is required, where the QD interacts with only one mode of the optical field and is free from decoherence. We have developed a near-optimal QD-photon interface by deterministically coupling a QD to a microcavity [1]. With an electrical control, the QD transition is shown to be almost decoherence free. The QD-cavity devices present a cooperativity of 12 and the QD state can be coherently manipulated with a π-pulse obtained for only 4 incident photons [2]. The devices operate as bright solid-state single-photon sources with single photon purity and indistinguishability above 98% and a brightness exceeding 20 times that of parametric down-conversion sources [3]. We also report on a single-photon filter that converts a coherent pulse into a highly non-classical light wavepacket [4], a first step toward deterministic two photon gates.

[1] A. Dousse, et al., Phys. Rev. Lett. 101, 267404 (2008). [2] V. Giesz, et al., Nature Communications 7, 11986 (2016). [3] N. Somaschi, et al., Nature Photonics 10, 340 (2016). [4] L. De Santis, et al., arXiv:1607.05977.