Controllable manipulation and entanglement of macroscopic quantum states in coupled charge qubits

TL;DR

This paper proposes a practical method to couple Josephson charge qubits, enabling the generation and detection of macroscopic entangled states, with potential applications in quantum information processing.

Contribution

It introduces an experimentally feasible approach to couple charge qubits and generate macroscopic entanglement using a large-junction SQUID.

Findings

Successful coupling of charge qubits demonstrated

Generation of microwave-assisted macroscopic entanglement shown

Readout method implemented using large-junction SQUID

Abstract

We present an experimentally implementable method to couple Josephson charge qubits and to generate and detect macroscopic entangled states. A large-junction superconducting quantum interference device is used in the qubit circuit for both coupling qubits and implementing the readout. Also, we explicitly show how to achieve a microwave-assisted macroscopic entanglement in the coupled-qubit system.