A quantum spin transducer based on nano electro-mechancial resonator arrays

TL;DR

This paper proposes a universal quantum data bus using magnetized mechanical resonators to enable long-distance coherent spin-spin coupling, facilitating hybrid quantum computing architectures.

Contribution

It introduces a novel method to couple electronic spin qubits over long distances via charged mechanical resonators and Coulomb forces, enhancing quantum information processing.

Findings

Enables coherent spin-spin coupling over long distances

Amplifies magnetic moments via charged resonators

Applicable to various electronic spin qubits

Abstract

Implementation of quantum information processing faces the contradicting requirements of combining excellent isolation to avoid decoherence with the ability to control coherent interactions in a many-body quantum system. For example, spin degrees of freedom of electrons and nuclei provide a good quantum memory due to their weak magnetic interactions with the environment. However, for the same reason it is difficult to achieve controlled entanglement of spins over distances larger than tens of nanometers. Here we propose a universal realization of a quantum data bus for electronic spin qubits where spins are coupled to the motion of magnetized mechanical resonators via magnetic field gradients. Provided that the mechanical system is charged, the magnetic moments associated with spin qubits can be effectively amplified to enable a coherent spin-spin coupling over long distances via Coulomb forces. Our approach is applicable to a wide class of electronic spin qubits which can be localized near the magnetized tips and can be used for the implementation of hybrid quantum computing architectures.