Generation of maximally entangled charge-qubit arrays via a cavity mode

TL;DR

This paper proposes a method to generate maximally entangled states of charge qubits using a cavity mode, enabling Heisenberg-limited spectroscopy with potential applications to various superconducting qubits.

Contribution

It introduces a scheme for creating maximally entangled charge-qubit arrays via cavity-mediated interactions, advancing quantum information processing capabilities.

Findings

Successfully generates maximally entangled states of charge qubits.

Achieves Heisenberg-limited precision in spectroscopy.

Applicable to different types of superconducting qubits.

Abstract

We describe an assembly of N Cooper-pair boxes (CPB) contained in a single mode cavity. In the dispersive regime, the correlation between the cavity field and each Cooper-pair box results in an effective interaction between CPBs that can be used to dynamically generate maximally entangled states. With only collective manipulations, we show how to create maximally entangled quantum states and how to use these states to reach the Heisenberg limit in the determination of a spectroscopy frequency. This scheme can be applied to other types of superconducting qubits.