Quantum State Transfer in a Magnetic Atoms Chain Using a Scanning Tunneling Microscope

TL;DR

This paper demonstrates the feasibility of controlled quantum state transfer in a chain of magnetic atoms using an STM, showing high fidelity and short transfer times with realistic parameters and current technology.

Contribution

It introduces a method for electric control of quantum spin chains for state transfer using STM, combining theoretical modeling with practical parameter sets.

Findings

High-fidelity quantum state transfer achievable in short times

Control pulses within current technological capabilities

Modeling aligns with recent experimental and ab initio data

Abstract

The electric control of quantum spin chains has been an outstanding goal for the few last years due to its potential use in technologies related to quantum information processing. In this work, we show the feasibility of the different steps necessary to perform controlled quantum state transfer in a $S=1/2$ titanium atoms chain employing the electric field produced by a Scanning Tunneling Microscope (STM). Our results show that the initialization and transmission of a single excitation state is achievable in short times, and with high fidelity. Our study uses spin Hamiltonians to model the magnetic atoms chain, the tip of the STM, the interaction between it and the atoms chain and the electronic response to the fields applied by the tip, employing sets of parameters compatible with the latest experiments and ab initio calculations. The time dynamical evolution is considered in the full Hilbert space and the control pulses frequencies exerted by the tip of the microscope are within the reach of present day technology.