Coherent transfer of electron spin correlations assisted by dephasing noise

被引：36

作者：

Nakajima, Takashi ^{[1
]}

Delbecq, Matthieu R. ^{[1
]}

Otsuka, Tomohiro ^{[1
,2
,3
]}

Amaha, Shinichi ^{[1
]}

Yoneda, Jun ^{[1
]}

Noiri, Akito ^{[1
,4
]}

Takeda, Kenta ^{[1
]}

Allison, Giles ^{[1
]}

Ludwig, Arne ^{[5
]}

Wieck, Andreas D. ^{[5
]}

Hu, Xuedong ^{[1
,6
]}

Nori, Franco ^{[1
,7
,8
]}

Tarucha, Seigo ^{[1
,4
]}

机构：

[1] RIKEN Ctr Emergent Matter Sci, Wako, Saitama 3510198, Japan

[2] JST, PRESTO, 4-1-8 Honcho, Kawaguchi, Saitama 3320012, Japan

[3] Tohoku Univ, Elect Commun Res Inst, Aoba Ku, 2-1-1 Katahira, Sendai, Miyagi 9808577, Japan

[4] Univ Tokyo, Dept Appl Phys, Bunkyo Ku, 7-3-1 Hongo, Tokyo 1138656, Japan

[5] Ruhr Univ Bochum, Lehrstuhl Angew Festkorperphys, D-44780 Bochum, Germany

[6] SUNY Buffalo, Dept Phys, Buffalo, NY 14260 USA

[7] RIKEN Cluster Pioneering Res, Theoret Quantum Phys Lab, Wako, Saitama 3510198, Japan

[8] Univ Michigan, Dept Phys, Ann Arbor, MI 48109 USA

来源：

NATURE COMMUNICATIONS | 2018年 / 9卷

关键词：

QUANTUM COMPUTATION; QUBIT; BITS;

D O I：

10.1038/s41467-018-04544-7

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

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.

引用

页数：8

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