Related papers: Ideal refocusing of an optically active spin qubit under strong hyperfine interactions

Ideal refocusing of an optically active spin qubit under strong hyperfine interactions

URL: http://arxiv.org/abs/2206.01223v1
Date: Thu, 2 Jun 2022 18:00:26 GMT
Title: Ideal refocusing of an optically active spin qubit under strong hyperfine interactions
Authors: Leon Zaporski, Noah Shofer, Jonathan H. Bodey, Santanu Manna, George Gillard, Daniel M. Jackson, Martin Hayhurst Appel, Christian Schimpf, Saimon Covre da Silva, John Jarman, Geoffroy Delamare, Gunhee Park, Urs Haeusler, Evgeny A. Chekhovich, Armando Rastelli, Dorian A. Gangloff, Mete Atat\"ure, and Claire Le Gall
Abstract summary: We show that eliminating strain inhomogeneity using lattice-matched GaAs-AlGaAs quantum dot devices prolongs the electron spin coherence by nearly two orders of magnitude. Our findings constitute the basis for highly coherent spin-photon interfaces.
Score: 0.48730499243678804
License: http://creativecommons.org/licenses/by/4.0/
Abstract: Combining highly coherent spin control with efficient light-matter coupling offers great opportunities for quantum communication and networks, as well as quantum computing. Optically active semiconductor quantum dots have unparalleled photonic properties, but also modest spin coherence limited by their resident nuclei. Here, we demonstrate that eliminating strain inhomogeneity using lattice-matched GaAs-AlGaAs quantum dot devices prolongs the electron spin coherence by nearly two orders of magnitude, beyond 0.113(3) ms. To do this, we leverage the 99.30(5)% fidelity of our optical pi-pulse gates to implement dynamical decoupling. We vary the number of decoupling pulses up to N = 81 and find a coherence time scaling of N^{0.75(2)}. This scaling manifests an ideal refocusing of strong interactions between the electron and the nuclear-spin ensemble, holding the promise of lifetime-limited spin coherence. Our findings demonstrate that the most punishing material science challenge for such quantum-dot devices has a remedy, and constitute the basis for highly coherent spin-photon interfaces.

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