| 研究実績の概要 |
We published two papers on the two topics of our study.
One of them was about the Coherent manipulation of a Majorana qubit by a mechanical resonator.
This is a paper published on PRB. In this work, we proposed a hybrid system composed of a Majorana qubit and a mechanical resonator, implemented by a semiconductor nanowire in proximity to an s-wave SC. In this proposal, three ferromagnetic gates are placed on top of and along the nanowire; the two outer gates are static and the inner one is free to oscillate harmonically as a mechanical resonator (Fig. 1). These ferromagnetic gates induce a local Zeeman splitting and give rise to four Majorana bound states, constituting a Majorana qubit in the nanowire. The dynamical hybridization of the Majorana bound states, arising from the motion of the oscillating gate, results in a coherent coupling between the Majorana qubit and the mechanical resonator. This hybrid system can be adjusted to be in resonance, e.g., with the assistance of a gate voltage on the ferromagnetic gates, which controls the Rashba SOC locally in the nanowire.Our study revealed that under resonance, a strong coupling between the qubit and the resonator can be achieved. Consequently, quantum information can be effectively transferred from the Majorana qubit to the oscillator and then back to the qubit. This quantum information transfer can manifest itself in modulating the motion of the oscillator, which may conversely signify the presence of the Majorana qubit.
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