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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Assessment of weak-coupling approximations on a driven two-level system under dissipation

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Teixeira, W. S. [1, 2] ; Semiao, F. L. [1] ; Tuorila, J. [2, 3] ; Mottonen, M. [2, 4]
Total Authors: 4
[1] Univ Fed ABC, Ctr Ciencias Nat & Humanas, BR-09210170 Santo Andre, SP - Brazil
[2] Aalto Univ, Dept Appl Phys, QTF Ctr Excellence, QCD Labs, POB 15100, FI-00076 Aalto - Finland
[3] IQM, Keilaranta 19, FI-02150 Espoo - Finland
[4] VTT Tech Res Ctr Finland Ltd, QTF Ctr Excellence, POB 1000, FI-02044 Espoo - Finland
Total Affiliations: 4
Document type: Journal article
Source: NEW JOURNAL OF PHYSICS; v. 24, n. 1 JAN 2022.
Web of Science Citations: 0

The standard weak-coupling approximations associated to open quantum systems have been extensively used in the description of a two-level quantum system, qubit, subjected to relatively weak dissipation compared with the qubit frequency. However, recent progress in the experimental implementations of controlled quantum systems with increased levels of on-demand engineered dissipation has motivated precision studies in parameter regimes that question the validity of the approximations, especially in the presence of time-dependent drive fields. In this paper, we address the precision of weak-coupling approximations by studying a driven qubit through the numerically exact and non-perturbative method known as the stochastic Liouville-von Neumann equation with dissipation. By considering weak drive fields and a cold Ohmic environment with a high cutoff frequency, we use the Markovian Lindblad master equation as a point of comparison for the SLED method and study the influence of the bath-induced energy shift on the qubit dynamics. We also propose a metric that may be used in experiments to map the regime of validity of the Lindblad equation in predicting the steady state of the driven qubit. In addition, we study signatures of the well-known Mollow triplet and observe its meltdown owing to dissipation in an experimentally feasible parameter regime of circuit electrodynamics. Besides shedding light on the practical limitations of the Lindblad equation, we expect our results to inspire future experimental research on engineered open quantum systems, the accurate modeling of which may benefit from non-perturbative methods. (AU)

FAPESP's process: 17/09058-2 - Non-trivial open quantum dynamics motivated by quantum technologies
Grantee:Wallace Santos Teixeira
Support Opportunities: Scholarships in Brazil - Doctorate
FAPESP's process: 18/26726-1 - Open quantum systems simulation with superconducting qubits
Grantee:Wallace Santos Teixeira
Support Opportunities: Scholarships abroad - Research Internship - Doctorate