Speaker
Description
We have conducted a comprehensive study of hybrid quantum systems at mesoscopic scales, proposing an intriguing system that is a movable superconducting grain. We explore the potential of a nanomechanical superconducting shuttle as a promising model for investigating 'flying qubits.' Within this study, we examine a nanoelectromechanical system that comprises a Cooper pair box qubit executing nanomechanical vibrations between two bulk superconductors. We demonstrate that the application of a bias voltage to the superconductors can generate states characterized by entanglement between qubit states and quantum 'cat states,' representing a superposition of coherent states of the nanomechanical oscillator [1]. We also suggest that flying qubit states formed on a movable CPB can be observed in electron transport to a normal electrode via Andreev reflections [2].
References
1. Danko Radic, Sang-Jun Choi, Hee Chul Park, Junho Suh, Leonid Gorelik, and Robert Shekhter, Nanomechanical cat states generated by a dc voltage-driven Cooper pair box qubit, npj, Quantum, Info., 8, 74 (2022)
2. Sunghun Park, Leonid Gorelik, Sergiy Kulinich, Hee Chul Park, Chulki Kim, and Robert Shekhter, Andreev probing of Cooper-pair flying qubit, arXiv:2310.13233v1 (2023)
