Non-Markovian entanglement dynamics in coupled superconducting qubit systems

TL;DR

This paper theoretically investigates how entanglement evolves in coupled superconducting qubits, focusing on non-Markovian effects, decoherence parameters, and control methods to prolong entanglement in Josephson junction systems.

Contribution

It introduces a non-Markovian master equation approach to analyze entanglement dynamics and control in coupled superconducting qubits, highlighting the influence of temperature and phase adjustments.

Findings

Entanglement can be generated and controlled in Josephson junction qubits.

Higher ratio r and temperature lead to faster decoherence.

Adjusting temperature and phases prolongs entanglement and delays ESD.

Abstract

We theoretically analyze the entanglement generation and dynamics by coupled Josephson junction qubits. Considering a current-biased Josephson junction (CBJJ), we generate maximally entangled states. In particular, the entanglement dynamics is considered as a function of the decoherence parameters, such as the temperature, the ratio $r\equiv\omega_c/\omega_0$ between the reservoir cutoff frequency $\omega_c$ and the system oscillator frequency $\omega_0$, % between $\omega_0$ the characteristic frequency of the %quantum system of interest, and $\omega_c$ the cut-off frequency of %Ohmic reservoir and the energy levels split of the superconducting circuits in the non-Markovian master equation. We analyzed the entanglement sudden death (ESD) and entanglement sudden birth (ESB) by the non-Markovian master equation. Furthermore, we find that the larger the ratio $r$ and the thermal energy $k_BT$, the shorter the decoherence. In this superconducting qubit system we find that the entanglement can be controlled and the ESD time can be prolonged by adjusting the temperature and the superconducting phases $\Phi_k$ which split the energy levels.