Dissipation and fluctuations in elongated bosonic Josephson junctions

Year: 2021

Authors: Binanti F., Furutani K., Salasnich L.

Autors Affiliation: Univ Padua, Dipartimento Fis & Astron Galileo Galilei, Via Marzolo 8, I-35131 Padua, Italy; Ist Nazl Fis Nucl, Sez Padova, Via Marzolo 8, I-35131 Padua, Italy; Univ Padua, Padua Quantum Technol Res Ctr, Via Gradenigo 6-B, I-35131 Padua, Italy; CNR, INO, Via Nello Carrara 1, I-50019 Sesto Fiorentino, Italy.

Abstract: We investigate the dynamics of bosonic atoms in elongated Josephson junctions. We find that these systems are characterized by an intrinsic coupling between the Josephson mode of macroscopic quantum tunneling and the sound modes. This coupling of Josephson and sound modes gives rise to a damped and stochastic Langevin dynamics for the Josephson degree of freedom. From a microscopic Lagrangian, we deduce and investigate the damping coefficient and the stochastic noise, which includes thermal and quantum fluctuations. Finally, we study the time evolution of relative-phase and population-imbalance fluctuations of the Josephson mode and their oscillating thermalization to equilibrium.

Journal/Review: PHYSICAL REVIEW A

Volume: 103 (6)      Pages from: 063309-1  to: 063309-8

More Information: The authors acknowledge Anna Minguzzi and Juan Polo for useful clarifications. L.S. thanks Andrea Tononi and Flavio Toigo for enlightening discussions. K.F. was supported by a Ph.D. fellowship from the Fondazione Cariparo.
KeyWords: quantum-noise
DOI: 10.1103/PhysRevA.103.063309

Citations: 7
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