Quantum decoherence of spin states in an electric-field controllable single molecular magnet

TL;DR

This paper investigates the non-Markovian quantum decoherence dynamics of spin states in a single molecular magnet under electric control, revealing how environmental manipulation can suppress decoherence and influence pointer states.

Contribution

It provides an analytical framework for understanding non-Markovian effects on spin decoherence in electric-field controlled molecular magnets, highlighting environmental spectral density influence.

Findings

Decoherence can be suppressed via environment spectral density and electric field control.

Non-Markovian oscillations of the Bloch vector are observed at low temperatures.

Pointer states are determined by the environment, affecting quantum state stability.

Abstract

The time evolution of low energy spin states of a single molecular magnet in a local electric field is investigated. The decoherence of the driven single molecular magnet weakly coupled to a thermal bosonic environment is analyzed by the second-order time-convolutionless non-Markovian master equation. If the characteristic time of the system is much smaller than the correlation time of the environment, the analytical expression of the reduced density matrix of the system is obtained. The non-Markovian dynamics of the spin states at low temperatures is induced by the memory effects in the decay rates. The non-Markovian oscillation of the Bloch vector is presented. The quantum decoherence can be effectively restrained with the help of the reasonable manipulation of the environment spectral density function and local electric field. The influence of the dissipation on the pointer states are investigated by the von Neumann entropy. The pointer states can be selected by the environment.