One-step implementation of multi-qubit conditional phase gating with nitrogen-vacancy centers coupled to a high-Q silica microsphere cavity

TL;DR

This paper proposes a one-step method to implement multi-qubit conditional phase gates using nitrogen-vacancy centers coupled to a high-Q silica microsphere cavity, enhancing scalability and reducing decoherence.

Contribution

It introduces a novel one-step scheme for multi-qubit gates with NV centers, leveraging Raman transitions and smart encoding, suitable for more qubits and experimentally feasible.

Findings

Decoherence is significantly suppressed in the scheme.

The method is feasible with current experimental technology.

Supports scalable multi-qubit quantum gates.

Abstract

The diamond nitrogen-vacancy (NV) center is an excellent candidate for quantum information processing, whereas entangling separate NV centers is still of great experimental challenge. We propose an one-step conditional phase flip with three NV centers coupled to a whispering-gallery mode cavity by virtue of the Raman transition and smart qubit encoding. As decoherence is much suppressed, our scheme could work for more qubits. The experimental feasibility is justified.