Collectively Enhanced Interactions in Solid-state Spin Qubits

TL;DR

This paper introduces a method to enhance interactions between solid-state spin qubits by leveraging collective delocalized modes, enabling long-range quantum logic with potential applications in quantum computing.

Contribution

The work demonstrates the emergence of a collective delocalized eigenmode in disordered spin networks, leading to enhanced interactions and long-range quantum logic capabilities.

Findings

Collective delocalized eigenmode forms under transverse magnetic field.

Interaction strength scales with the square root of the number of spins.

Potential implementation with Nitrogen-Vacancy centers in diamond.

Abstract

We propose and analyze a technique to collectively enhance interactions between solid-state quantum registers composed from random networks of spin qubits. In such systems, disordered dipolar interactions generically result in localization. Here, we demonstrate the emergence of a single collective delocalized eigenmode as one turns on a transverse magnetic field. The interaction strength between this symmetric collective mode and a remote spin qubit is enhanced by square root of the number of spins participating in the delocalized mode. Mediated by such collective enhancement, long-range quantum logic between remote spin registers can occur at distances consistent with optical addressing. A specific implementation utilizing Nitrogen-Vacancy defects in diamond is discussed and the effects of decoherence are considered.