Quantum dynamics of a driven two-level molecule with variable dephasing

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Title: Quantum dynamics of a driven two-level molecule with variable dephasing
Author(s): Grandi, S
Major, K
Polisseni, C
Boissier, S
Clark, A
Hinds, EA
Item Type: Journal Article
Abstract: The longitudinal (Γ₁) and transverse (Γ₂) decay rates of a two-level quantum system have profound influence on its evolution. Atomic systems with Γ₂=½Γ₁ have been studied extensively, but with the rise of solid-state quantum devices it is also important to consider the effect of stronger transverse relaxation due to interactions with the solid environment. Here we study the quantum dynamics of a single organic dye molecule driven by a laser. We measure the variation of Γ₂ with temperature and determine the activation energy for thermal dephasing of the optical dipole. Then we measure the second-order correlation function g⁽²⁾(τ) of the light emitted by the molecule for various ratios Γ₂/Γ₁ and saturation parameters S. We show that the general solution to the optical Bloch equations accurately describes the observed quantum dynamics over a wide range of these parameters, and we discuss the limitations of the various approximate expressions for g⁽²⁾(τ) that appear in the literature.
Publication Date: 19-Dec-2016
Date of Acceptance: 14-Nov-2016
ISSN: 1094-1622
Publisher: American Physical Society
Journal / Book Title: Physical Review A
Volume: 94
Issue: 6
Copyright Statement: © 2016 The Authors.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.
Keywords: General Physics
02 Physical Sciences
01 Mathematical Sciences
03 Chemical Sciences
Publication Status: Published
Article Number: 063839
Appears in Collections:Quantum Optics and Laser Science
Faculty of Natural Sciences

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