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Physica C Superconductivity

High-fidelity quantum state transfer using Cooper-pair box qubits

Zhi‐Bo Feng, M. Li

Published Oct 12, 2014• 3 citations
Publisher
DOI
10.1016/j.physc.2014.10.004

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We propose a nanomechanical device which can actuate and probe a flying qubit that can be used to facilitate quantum information transfer over a long 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 removing the Coulomb blockade of Cooper pair tunneling electrostatically. We suggest that flying qubit states formed on 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 nonzero current at zero voltage and its coherence can be identified through oscillatory dependence of the current on a gate voltage.