Long-Distance Spin-Spin Coupling via Floating Gates

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Long-Distance Spin-Spin Coupling via Floating Gates

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Title: Long-Distance Spin-Spin Coupling via Floating Gates
Author: Trifunovic, Luka; Trif, Mircea; Wootton, James; Loss, Daniel; Dial, Oliver; Yacoby, Amir; Abebe, Rediet Tesfaye

Note: Order does not necessarily reflect citation order of authors.

Citation: Trifunovic, Luka, Oliver Dial, Mircea Trif, James R. Wooton, Rediet Abebe, Amir Yacoby, and Daniel Loss. 2012. Long-distance spin-spin coupling via floating gates. Physical Review X 2(1): 011006.
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Abstract: The electron spin is a natural two-level system that allows a qubit to be encoded. When localized in a gate-defined quantum dot, the electron spin provides a promising platform for a future functional quantum computer. The essential ingredient of any quantum computer is entanglement—for the case of electron-spin qubits considered here—commonly achieved via the exchange interaction. Nevertheless, there is an immense challenge as to how to scale the system up to include many qubits. In this paper, we propose a novel architecture of a large-scale quantum computer based on a realization of long-distance quantum gates between electron spins localized in quantum dots. The crucial ingredients of such a long-distance coupling are floating metallic gates that mediate electrostatic coupling over large distances. We show, both analytically and numerically, that distant electron spins in an array of quantum dots can be coupled selectively, with coupling strengths that are larger than the electron-spin decay and with switching times on the order of nanoseconds.
Published Version: doi://10.1103/PhysRevX.2.011006
Other Sources: http://arxiv.org/abs/1110.1342v1
Terms of Use: This article is made available under the terms and conditions applicable to Open Access Policy Articles, as set forth at http://nrs.harvard.edu/urn-3:HUL.InstRepos:dash.current.terms-of-use#OAP
Citable link to this page: http://nrs.harvard.edu/urn-3:HUL.InstRepos:8157242

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