Park, Sunghun L. Y. Gorelik S. I. Kulinich H. C. Park Kim, Chulki R. I. Shekhter 2025-04-11T02:00:05Z 2025-04-11T02:00:05Z 2025-04-11 2025-04 2469-9950 https://pubs.kist.re.kr/handle/201004/152257 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. English AMER PHYSICAL SOC Andreev probing of a Cooper-pair flying qubit Article 10.1103/PhysRevB.111.165403 1 Physical Review B, v.111, no.16 Physical Review B 111 16 N scie scopus 001465747200003 Materials Science, Multidisciplinary Physics, Applied Physics, Condensed Matter Materials Science Physics Article