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Tunneling of bosonic qubits under local dephasing through a microscopic approach

Alberto Ferrara1,*, Farzam Nosrati1,2, Andrea Smirne3,4, Jyrki Piilo5, and Rosario Lo Franco1

  • *Contact author: alberto.ferrara@unipa.it
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Phys. Rev. A 114, 012415 – Published 6 July, 2026

DOI: https://doi.org/10.1103/f2sy-sj27

Abstract

We present a microscopic derivation of a master equation for two-component bosons (bosonic qubits) which tunnel between spatially separated modes under local dephasing noise. Starting from the full system-bath Hamiltonian with Lorentzian coupling distributions, we analytically obtain a time-local master equation whose structure reveals intrinsic non-Markovian features and recovers the standard phenomenological dephasing model in the short-time limit. Comparison with exact pseudomode simulations confirms its validity beyond weak-coupling and Markovian regimes. We identify a resonance condition between tunneling and bath frequencies for which dephasing drives the system toward correlated steady states, stabilizing coherence and entanglement instead of suppressing them. These results establish a rigorous microscopic foundation for dephasing models in bosonic tunneling systems and reveal a noise-induced mechanism for steady-state entanglement.

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Phys. Rev. A 114, 012415– Published 6 July, 2026
  • Received 10 December 2025
  • Accepted 17 June 2026
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Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI.

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