Quantum Entanglement of a Tunneling Spin with Mechanical Modes of a Torsional Resonator

Authors

Dmitry A. Garanin, CUNY Lehman CollegeFollow
Eugene M. Chudnovsky, CUNY Lehman CollegeFollow

Document Type

Article

Publication Date

2011

Abstract

We solve Schr\"odinger equation describing a tunneling macrospin coupled to a torsional oscillator. Energy spectrum is studied for various quantum regimes. Magnetic susceptibility and noise spectrum are computed. We show that entanglement of the spin with mechanical modes of a subnanometer oscillator results in the decoherence of spin tunneling. For larger oscillators the presence of a tunneling spin can be detected through splitting of the mechanical mode at the resonance. Our results apply to experiments with magnetic molecules coupled to nanoresonators.

Comments

This work was originally published in Physical Review X, available at DOI: 10.1103/PhysRevX.1.011005.