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Choi, Sang Jun
복잡계 이론물리 연구단
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Nanomechanical cat states generated by a dc voltage-driven Cooper pair box qubit

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Title
Nanomechanical cat states generated by a dc voltage-driven Cooper pair box qubit
Author(s)
Radić, Danko; Sang-Jun Choi; Hee Chul Park; Suh, Junho; Shekhter, Robert I.; Gorelik, Leonid Y.
Publication Date
2022-06
Journal
npj Quantum Information, v.8, no.1
Publisher
Nature Research
Abstract
We study a nanoelectromechanical system consisting of a Cooper pair box qubit performing nanomechanical vibrations between two bulk superconductors. We demonstrate that a bias voltage applied to the superconductors may generate states represented by entanglement between qubit states and quantum ’cat states’, i.e. a superposition of the coherent states of the nanomechanical oscillator. We characterize the formation and development of such states in terms of the corresponding Wigner function and entropy of entanglement. Also, we propose an experimentally feasible detection scheme for the effect, in which the average current that attains the specific features created by the entanglement is measured.
URI
https://pr.ibs.re.kr/handle/8788114/12296
DOI
10.1038/s41534-022-00584-6
ISSN
2056-6387
Appears in Collections:
Center for Theoretical Physics of Complex Systems(복잡계 이론물리 연구단) > 1. Journal Papers (저널논문)
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