Open Quantum Systems Driven by Chirped Pulses: Quantized versus Semiclassical Fields and the Validity of the Rotating-Wave Approximation

• URL: http://arxiv.org/abs/2607.00583v1
• Date: Wed, 01 Jul 2026 08:07:32 GMT
• Title: Open Quantum Systems Driven by Chirped Pulses: Quantized versus Semiclassical Fields and the Validity of the Rotating-Wave Approximation
• Abstract summary: Population transfer via chirped rapid adiabatic passage is studied using open quantum and semiclassical models.<n>We examine the accuracy of both the semiclassical field description and the rotating-wave approximation.
• Score: 4.044226252846307
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: Population transfer via chirped rapid adiabatic passage is studied using open quantum and semiclassical models, with and without the rotating-wave approximation. A time-dependent variational approach based on the multiple-Davydov D$_2$ trial state is employed to simulate the quantum models with an arbitrary finite mean photon number. We examine the accuracy of both the semiclassical field description and the rotating-wave approximation. Robust population transfer is identified over a wide parameter regime controlled by the laser spectral chirp and is found to be insensitive to the spin--phonon coupling strength, Gaussian pulse area, and energy gap of the two-level system.

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