Phase diffusion and fluctuations in a dissipative Bose-Josephson junction

TL;DR

This paper investigates phase diffusion and quantum fluctuations in a dissipative Bose-Josephson junction, revealing how on-site interactions and temperature influence phase stability and spectral properties across different dynamical regimes.

Contribution

It introduces a detailed analysis of phase diffusion and spectral features in a dissipative BJJ, highlighting the critical interaction strength for transition between Josephson oscillation and MQST.

Findings

Phase diffusion coefficient depends on interaction strength and temperature.

Critical interaction strength marks transition between Josephson oscillation and MQST.

Spectral properties vary with dissipation and phase mode.

Abstract

We analyze the phase diffusion, quantum fluctuations and their spectral features of an one-dimensional Bose-Josephson junction (BJJ) coupled to a bosonic heat bath. We show the dependence of the phase diffusion coefficient on the on-site interaction parameter $U$ and the temperature in zero-phase and $\pi$-phase modes. We find that in the $\pi$-phase mode, the phase diffusion co-efficient as a function of $U$ decreases so long as $U$ is below a critical value while it increases above the critical value. This criticality of on-site interaction reflects a transition between Josephson oscillation and macroscopic quantum self-trapping (MQST) regime. Based on the thermal canonical Wigner distribution, we calculate the coherence factor to understand its dependence on temperature and on-site interaction energy in Josephson oscillation and MQST regime. Furthermore, we discuss coherent and incoherent spectral properties in connection with the fluctuations of the relative phase and the population imbalance in both zero and $\pi$-phase modes from weak to strong dissipation regime.