Andreev probing of a Cooper-pair flying qubit

We propose a superconducting nanomechanical device that can actuate and probe an oscillating flying qubit facilitating quantum information transfer over a distance. The flying qubit is formed by a movable Cooper-pair box (CPB) consisting of a superconducting dot and a bulk superconductor, which are entangled by lifting the Coulomb blockade of Cooper-pair tunneling electrostatically. We show that flying qubit states formed on a movable CPB can be observed in electron transport to a normal electrode via Andreev reflections. The charge transfer due to periodic mechanical motion of CPB leads to the occurrence of a nonzero current at zero bias voltage, and its coherence can be identified through the oscillatory current dependence of the current on a gate voltage. The proposed device provides a building block for dissipationless quantum information circuits.

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Publication Details

Journal
Physical review. B./Physical review. B
Published
2025-04-03
DOI
https://doi.org/10.1103/physrevb.111.165403
Primary Topic
Mechanical and Optical Resonators
Type
article
Field-Weighted Citation Impact
0.00

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article

Andreev probing of a Cooper-pair flying qubit

L. Y. Gorelik, S. I. Kulinich, R. I. Shekhter, Sunghun Park et al.
Physical review. B./Physical review. B
Mechanical and Optical Resonators
article

Andreev probing of a Cooper-pair flying qubit

L. Y. Gorelik, S. I. Kulinich, R. I. Shekhter, Sunghun Park, Chulki Kim, Hee Chul Park
article en

Abstract

We propose a superconducting nanomechanical device that can actuate and probe an oscillating flying qubit facilitating quantum information transfer over a distance. The flying qubit is formed by a movable Cooper-pair box (CPB) consisting of a superconducting dot and a bulk superconductor, which are entangled by lifting the Coulomb blockade of Cooper-pair tunneling electrostatically. We show that flying qubit states formed on a movable CPB can be observed in electron transport to a normal electrode via Andreev reflections. The charge transfer due to periodic mechanical motion of CPB leads to the occurrence of a nonzero current at zero bias voltage, and its coherence can be identified through the oscillatory current dependence of the current on a gate voltage. The proposed device provides a building block for dissipationless quantum information circuits.

Physical review. B./Physical review. BVol. 111(16)
National Academy of Sciences of Ukraine (UA), Institute for Basic Science (KR), B. Verkin Institute for Low Temperature Physics and Engineering of the National Academy of Sciences of Ukraine (UA), Korea Institute of Science and Technology (KR), Chalmers University of Technology (SE), University of Gothenburg (SE), Pukyong National University (KR)
Pukyong National University, Korea Institute of Science and Technology, National Research Foundation of Korea, Institute for Basic Science, Ministry of Science and ICT, South Korea, Defense Acquisition Program Administration, Institute for Information and Communications Technology Promotion
Openalex Percentile: Top 95%
Mechanical and Optical Resonators
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