Resource state generation for a multispin register in a hybrid matter-photon quantum information processor

TL;DR

This paper develops pulse control sequences to generate resource states in multispin registers within hybrid matter-photon quantum processors, enhancing control fidelity and robustness for scalable quantum computing.

Contribution

It introduces novel pulse sequences using composite, shaped, and optimal control techniques for high-fidelity, robust spin interaction management in hybrid quantum architectures.

Findings

Effective pulse sequences for resource state generation demonstrated in NV centers.

Robust control methods withstand static detunings and Rabi fluctuations.

Applicable to various physical platforms beyond the studied systems.

Abstract

Hybrid quantum architectures that integrate matter and photonic degrees of freedom present a promising pathway toward scalable, fault-tolerant quantum computing. This approach needs to combine well-established entangling operations between distant registers using photonic degrees of freedom with direct interactions between matter qubits within a solid-state register. The high-fidelity control of such a register, however, poses significant challenges. In this work, we address these challenges with pulsed control sequences which modulate all inter-spin interactions to preserve the nearest-neighbor couplings while eliminating unwanted long-range interactions. We derive pulse sequences, including broadband and selective gates, using composite pulse and shaped pulse techniques as well as optimal control methods. This ensures a general pulse sequence in the presence of spin-position bias, and robustness against static offset detunings, and Rabi frequency fluctuations of the control fields. The control techniques developed here apply well beyond the present setting to a broad range of physical platforms. We demonstrate the efficacy of our methods for the resource state generation for fusion-based quantum computing in four- and six-spin systems encoded in the electronic ground states of nitrogen-vacancy centers or other molecular solid-state qubits. We also outline other elements of the proposed architecture, highlighting its potential for advancing quantum computing technology.