Dark States and Coherent Control of Spin States in Molecular Magnets

TL;DR

This paper presents a method to coherently control the spin states of Ni4 molecular magnets using specially tuned transverse magnetic fields, enabling the creation of dark states and arbitrary superpositions of ground states.

Contribution

It introduces a novel scheme employing specific magnetic field frequencies to achieve dark states and arbitrary superpositions in Ni4 molecules, advancing quantum control techniques.

Findings

Dark states can be realized in Ni4 molecules under certain magnetic field conditions.

Arbitrary superpositions of ground spin states are achievable by adjusting magnetic field magnitudes.

The scheme provides a new approach for quantum manipulation of molecular magnet spin states.

Abstract

We propose a scheme to realize coherent control of spin states of molecule magnet, Ni$_4$. We introduce transverse magnetic fields with special frequencies. When the frequencies of transverse magnetic fields match in some conditions, we obtain dark states in Ni$_4$ molecules. Through adjusting the magnitude of magnetic fields, we can obtain any arbitrary superposition of the two ground spin states of Ni$_4$ molecules.