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Tunneling of bosonic qubits under local dephasing through a microscopic approach;



Tekijät: Ferrara, Alberto; Nosrati, Farzam; Smirne, Andrea; Piilo, Jyrki; Lo Franco, Rosario

Kustantaja: American Physical Society (APS)

Julkaisuvuosi: 2026

Lehti: Physical Review A

Artikkelin numero: 012415

Vuosikerta: 114

Numero: 1

ISSN: 2469-9926

eISSN: 2469-9934

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

Julkaisun avoimuus kirjaamishetkellä: Avoimesti saatavilla

Julkaisukanavan avoimuus : Osittain avoin julkaisukanava

Verkko-osoite: https://doi.org/10.1103/f2sy-sj27

Rinnakkaistallenteen osoite: https://research.utu.fi/converis/portal/detail/Publication/527028784

Rinnakkaistallenteen lisenssi: CC BY

Rinnakkaistallennetun julkaisun versio: Kustantajan versio


Tiivistelmä

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.


Ladattava julkaisu

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Julkaisussa olevat rahoitustiedot: 
R.L.F. acknowledges support from Ministero dell'Università e della Ricerca (MUR) through PNRR Project ICON-Q, Partenariato Esteso NQSTI, Project No. PE00000023, Spoke 2, CUP J13C22000680006; PNRR Project QUANTIP, Partenariato Esteso NQSTI, Project No. PE00000023, Spoke 9, CUP E63C22002180006; and PNRR Project PRISM, Partenariato Esteso RESTART, Project No. PE00000001, Spoke 4, CUP C79J24000190004. A.S. acknowledges support from MUR and Next Generation EU via the PRIN 2022 Project “Quantum Reservoir Computing (QuReCo)” (Contract No. 2022FEXLYB) and the NQSTI-Spoke1-BaC project QSynKrono (Contract No. PE00000023-QuSynKrono). F.N. acknowledges support by the I+D+i project MADQuantum-CM, financed by the European Union NextGeneration-EU, Madrid Government and by the PRTR. A.F. would like to thank Matteo Piccolini for a critical reading of the manuscript and Nicola Macrì for useful discussions.


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