Quantum action of the Josephson dynamics

2025/08/31 by Vianello, Cesare, Salvatore, Sofia, Salasnich, Luca · 1 citation
#FOS: Physical sciences #Quantum Gases (cond-mat.quant-gas) #Quantum Physics (quant-ph) #Superconductivity (cond-mat.supr-con)

paper · doi:10.48550/arxiv.2509.00902

Abstract

We study the beyond-mean-field Josephson dynamics of the relative phase between two coupled macroscopic quantum systems. Using a covariant background field method, we derive the one-loop only-phase quantum effective action and the corresponding equation of motion for the quantum average of the phase. These analytical results are benchmarked against the exact quantum dynamics of the two-site Bose-Hubbard model, demonstrating a relevant improvement over the standard mean-field predictions across a wide range of interaction strengths.

Citations

• Finite-temperature entanglement and coherence in asymmetric bosonic Josephson junctions
• Self-induced Josephson oscillations and self-trapping in a supersolid dipolar quantum gas
• Self-sustained Josephson dynamics and self-trapping in supersolids
• Sub-unity superfluid fraction of a supersolid from self-induced Josephson effect
• Macroscopic quantum self-trapping and Josephson oscillations of exciton polaritons
• Comparison between quantum and classical dynamics in the effective action formalism
• Radiative Corrections as the Origin of Spontaneous Symmetry Breaking
• Radiative Corrections as the Origin of Spontaneous Symmetry Breaking

Cited by

• Effective action approach to quantum and thermal effects: from one particle to Bose-Einstein condensates

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