# Manipulating Quantum Spins by a Spin-Polarized Current: An Approach Based Upon PT-Symmetric Quantum Mechanics

## TL;DR

This paper introduces a quantum processor model using PT-symmetric quantum mechanics to control small spin systems with spin-polarized currents, enabling manipulation of spin qubits via electric currents.

## Contribution

It presents a novel quantum approach for spin manipulation based on PT-symmetric Hamiltonians, extending the study of spin transfer torque to quantum small-spin systems.

## Key findings

- Demonstrates quantum spin tunneling induced by spin-polarized currents
- Proposes a PT-symmetric framework for spin qubit control
- Highlights potential for electric-current-based quantum spin manipulation

## Abstract

We propose a quantum processor based upon single-molecule magnets and spin transfer torque described by PT-symmetric quantum mechanics. In recent years PT-symmetric Hamiltonians have been used to obtain stability thresholds of various systems out of equilibrium. One such problem is the magnetization reversal due to the spin transfer torque generated by a spin-polarized current. So far the studies of this problem have mostly focused on a classical limit of a large spin. In this work we are discussing spin tunneling and quantum dynamics of a small spin induced by a spin polarized current within a PT-symmetric theory. This description can be used for manipulating spin qubits by electric currents.