Creating arbitrary quantum vibrational states in a carbon nanotube

Article

关键词: MECHANICAL RESONATOR;    GROUND-STATE;    PHASE-SPACE;    FIELD;    SPIN;    GENERATION;    MOTION;   

DOI  :  10.1103/PhysRevB.94.205413

来源: SCIE

【 摘 要 】

We theoretically study the creation of single-and multiphonon 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 an electric gate potential and brought into the magnetic field of a micromagnet. 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 nonlinearity. 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.

【 授权许可】

Free