Entanglement of Two-Superconducting-Qubit System Coupled with a Fixed Capacitor

TL;DR

This paper investigates thermal entanglement in a two-superconducting-qubit system, showing that entanglement is significantly enhanced at low temperatures and Josephson energies, aligning well with experimental observations.

Contribution

It provides a theoretical analysis of entanglement enhancement in superconducting qubits, considering both identical and distinct qubit cases, with validation against experimental data.

Findings

Entanglement increases at low temperatures and Josephson energies.

Theoretical results agree with experimental data.

Identical qubits exhibit greater entanglement enhancement.

Abstract

We study thermal entanglement in a two-superconducting-qubit system in two cases, either identical or distinct. By calculating the concurrence of system, we find that the entangled degree of the system is greatly enhanced in the case of very low temperature and Josephson energies for the identical superconducting qubits, and our result is in a good agreement with the experimental data.