Cited by 169Quantum Information and CryptographyAdvanced Thermodynamics and Statistical MechanicsQuantum Mechanics and Applications

Local versus global master equation with common and separate baths: Superiority of the global approach in partial secular approximation

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Cattaneo, Marco, Giorgi, Gian Luca, Maniscalco, Sabrina, Zambrini, Roberta·2019·New Journal of Physics

Abstract

Abstract Open systems of coupled qubits are ubiquitous in quantum physics. Finding a suitable master equation to describe their dynamics is therefore a crucial task that must be addressed with utmost attention. In the recent past, many efforts have been made toward the possibility of employing local master equations, which compute the interaction with the environment neglecting the direct coupling between the qubits, and for this reason may be easier to solve. Here, we provide a detailed derivation of the Markovian master equation for two coupled qubits interacting with common and separate baths, considering pure dephasing as well as dissipation. Then, we explore the differences between the local and global master equation, showing that they intrinsically depend on the way we apply the secular approximation. Our results prove that the global approach with partial secular approximation always provides the most accurate choice for the master equation when Born–Markov approximations hold, even for small inter-system coupling constants. Using different master equations we compute the stationary heat current between two separate baths, the entanglement dynamics generated by a common bath, and the emergence of spontaneous synchronization, showing the importance of the accurate choice of approach.

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  • In the dressed picture, local baths on each buffer spin become global baths acting collectively on the dressed buffer spins.

    “In the dressed picture, the separate baths acting locally on each buffer spins become global baths [102,103] acting collectively on the dressed buffer spins.”

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Authors
Cattaneo, M., Giorgi, G. L., Maniscalco, S., & Zambrini, R.
Affiliations
  • Consejo Superior de Investigaciones Científicas (ES)
  • University of Turku (FI)
Corresponding author
Cattaneo, Marco
Venue
New Journal of Physics
Published
2019-11-01
Volume
21
Issue
11
Pages
113045
ISSN
1367-2630 (ISSN-L)
OpenAlex
W2952234744
Cited by
169
References
105
Citations by year
2026: 14 · 2025: 31 · 2024: 30 · 2023: 19 · 2022: 28 · 2021: 33 · 2020: 12 · 2019: 2
FWCI
8.46
Type
journal article
Language
en
Open access
Locations
  • New Journal of Physics (publishedVersion, cc-by)
  • arXiv (Cornell University) (acceptedVersion)
  • Aaltodoc (Aalto University) (submittedVersion, cc-by)
  • UTUPub (University of Turku) (submittedVersion)
  • UTUPub (University of Turku) (submittedVersion, cc-by)
  • DIGITAL.CSIC (Spanish National Research Council (CSIC)) (submittedVersion, cc-by)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion)
  • arXiv (Cornell University)
Funders
Ministerio de Econom??a y Competitividad
Topics
  • Physical Sciences › Computer Science › Artificial Intelligence › Quantum Information and Cryptography
  • Physical Sciences › Physics and Astronomy › Statistical and Nonlinear Physics › Advanced Thermodynamics and Statistical Mechanics
  • Physical Sciences › Physics and Astronomy › Atomic and Molecular Physics, and Optics › Quantum Mechanics and Applications
Keywords
coupled qubits, Born-Markov approximation, Markovian dynamics, pure dephasing, energy dissipation, entanglement dynamics, spontaneous synchronization, open quantum systems

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