Producing GHZ state of nitrogen-vacancy centers in cavity QED

TL;DR

This paper presents a fast, scalable scheme to generate GHZ states of nitrogen-vacancy centers in cavity QED, which is insensitive to the cavity's thermal state and independent of its initial field condition.

Contribution

It introduces a novel, robust method for GHZ state generation in NV centers coupled to a whispering-gallery mode cavity, improving speed and scalability.

Findings

Scheme is insensitive to cavity thermal state

Operation is faster than conventional dispersive methods

Scalable to multiple qubits

Abstract

We propose a scheme to generate GHZ state of nitrogen-vacancy centers coupled to a whispering-gallery mode cavity. The implemented evolution is independent on the cavity field state with the assistant of a strong classical field, and thus not sensitive to the thermal state of the cavity. Meanwhile, it is fast compare to the convectional dispersive interaction induced operation in a cavity-assisted system. The scheme is readily scalable to multiqubit scenario.