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Conference on Lasers and Electro-Optics

Quantum dot spins in micropillar cavities

A. B. Young, Petros Androvitsaneas, J. M. Lennon, Christian Schneider, Stefan Alexander Maier, J.J. Hinchliff, George S. Atkinson, Edmund Harbord, Martin Kamp, Sven Höfling, John Rarity, Ruth Oulton

Published Jan 1, 2019• 0 citations
Publisher

Abstract

We will examine the requirements for generating photonic entanglement using a charged quantum dot in a pillar microcavity. We will discuss how to make an efficient device and parametrise the dynamics of the QD spin.
DOI
10.1364/cleo_si.2019.sth1h.1

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Graph states of mutually entangled photons are key resources for quantum computation and communication and can be generated by leveraging the entanglement between a single resident spin and emitted photons from a charged semiconductor quantum dot (QD). This approach is intrinsically limited by the decoherence of the spin. We study how to mitigate this decoherence with dynamical decoupling of an electron spin in the weak transverse magnetic field regime using spin echo and Carr-Purcell-Meiboom-Gill (CPMG) techniques. Application of these techniques allows us to extend the coherence time of a spin by more than two orders of magnitude, extracting a T2CPMGT_2^{CPMG}T2CPMG​ of 298±53298\pm53298±53 ns. We further demonstrate that this technique is compatible with the generation of a spin-photon-photon entangled state at a high rate enabled by a micropillar cavity, with a 20% improvement in simulated state fidelity when using dynamical decoupling. These results pave the way for generating larger and more complex entangled states with QDs.