Coherence and control of quantum registers based on electronic spin in a nuclear spin bath

TL;DR

This paper presents a protocol for controlling small quantum registers using electronic and nuclear spins in solid-state systems, enabling scalable quantum information processing with high fidelity and bath decoupling.

Contribution

It introduces a method to isolate and manipulate proximal nuclear spins as qubits within electronic spin systems, adapting magnetic resonance techniques for scalable quantum control.

Findings

Feasible high-fidelity control of nuclear spins in NV centers.

Effective decoupling from the nuclear spin bath.

Potential for scalable quantum information processing.

Abstract

We consider a protocol for the control of few-qubit registers comprising one electronic spin embedded in a nuclear spin bath. We show how to isolate a few proximal nuclear spins from the rest of the environment and use them as building blocks for a potentially scalable quantum information processor. We describe how coherent control techniques based on magnetic resonance methods can be adapted to these electronic-nuclear solid state spin systems, to provide not only efficient, high fidelity manipulation of the registers, but also decoupling from the spin bath. As an example, we analyze feasible performances and practical limitations in a realistic setting associated with nitrogen-vacancy centers in diamond.