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arXiv 1608.03068cond-mat.mes-hall
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在碳纳米管中产生任意量子振动态

Creating arbitrary quantum vibrational states in a carbon nanotube

Heng Wang, Guido Burkard

摘要:

我们从理论上研究了单声子和多声子Fock态的产生以及纳米机械碳纳米管(CNT)谐振器中量子声子态的任意叠加。在我们的模型中,双钳位碳纳米管谐振器初始化在基态和一个电子被困在量子点,这是由一个电子门电位形成的,并引入到一个微磁铁的磁场。任意量子声子态的制备是基于碳纳米管的机械运动和电子自旋之间的耦合,这是一种非线性。我们假设具有不同频率的电驱动脉冲施加在系统上。通过自旋-声子耦合将量子信息从自旋量子比特转换为机械运动,通过单电子自旋共振可以重置电子自旋量子比特。我们描述了维格纳层析成像,它可以应用在年底获得的相位信息的准备声子状态。

英文摘要:

We theoretically study the creation of single- and multi-phonon Fock states and arbitrary superpositions of quantum phonon states in a nanomechanical carbon nanotube (CNT) resonator. In our model, a doubly clamped CNT resonator is initialized in the ground state and a single electron is trapped in a quantum dot which is formed by a electric gate potential and brought into the magnetic field of a micro-magnet. The preparation of arbitrary quantum phonon states is based on the coupling between the mechanical motion of the CNT and the electron spin which acts as a non-linearity. We assume that electrical driving pulses with different frequencies are applied on the system. The quantum information is transferred from the spin qubit to the mechanical motion by the spin-phonon coupling and the electron spin qubit can be reset by the single-electron spin resonance. We describe Wigner tomography which can be applied at the end to obtain the phase information of the prepared phonon states.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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