Coherent transfer of electron spin correlations assisted by dephasing noise

Takashi Nakajima (), Matthieu R. Delbecq, Tomohiro Otsuka, Shinichi Amaha, Jun Yoneda, Akito Noiri, Kenta Takeda, Giles Allison, Arne Ludwig, Andreas D. Wieck, Xuedong Hu, Franco Nori and Seigo Tarucha ()
Additional contact information
Takashi Nakajima: RIKEN Center for Emergent Matter Science
Matthieu R. Delbecq: RIKEN Center for Emergent Matter Science
Tomohiro Otsuka: RIKEN Center for Emergent Matter Science
Shinichi Amaha: RIKEN Center for Emergent Matter Science
Jun Yoneda: RIKEN Center for Emergent Matter Science
Akito Noiri: RIKEN Center for Emergent Matter Science
Kenta Takeda: RIKEN Center for Emergent Matter Science
Giles Allison: RIKEN Center for Emergent Matter Science
Arne Ludwig: Ruhr-Universität Bochum
Andreas D. Wieck: Ruhr-Universität Bochum
Xuedong Hu: RIKEN Center for Emergent Matter Science
Franco Nori: RIKEN Center for Emergent Matter Science
Seigo Tarucha: RIKEN Center for Emergent Matter Science

Nature Communications, 2018, vol. 9, issue 1, 1-8

Abstract: Abstract Quantum coherence of superposed states, especially of entangled states, is indispensable for many quantum technologies. However, it is vulnerable to environmental noises, posing a fundamental challenge in solid-state systems including spin qubits. Here we show a scheme of entanglement engineering where pure dephasing assists the generation of quantum entanglement at distant sites in a chain of electron spins confined in semiconductor quantum dots. One party of an entangled spin pair, prepared at a single site, is transferred to the next site and then adiabatically swapped with a third spin using a transition across a multi-level avoided crossing. This process is accelerated by the noise-induced dephasing through a variant of the quantum Zeno effect, without sacrificing the coherence of the entangled state. Our finding brings insight into the spin dynamics in open quantum systems coupled to noisy environments, opening an avenue to quantum state manipulation utilizing decoherence effects.

Date: 2018
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Persistent link: https://EconPapers.repec.org/RePEc:nat:natcom:v:9:y:2018:i:1:d:10.1038_s41467-018-04544-7

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DOI: 10.1038/s41467-018-04544-7

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