Electromagnetically induced transparency in a V-type multilevel system of Na vapor

Hoshina, Yoshitaka; Hayashi, Nobuhito; Tsubota, Kosuke; Yoshida, Ichiro; Shijo, Kotaro; Sugizono, Ryuta; Mitsunaga, Masaharu

doi:10.1364/josab.31.001808

Cited by 9 publications

(2 citation statements)

References 30 publications

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“…There have been extensive efforts in realizing V-systems when truncating the energy levels of atoms with hyperfine levels to the first three, e.g. in rubidium [33,104], cesium [105], and sodium vapor [106]. However, incorporating asymmetric couplings via α introduces further complications, as couplings to different baths need to be selective while the level gaps are similar.…”

Section: Discussionmentioning

confidence: 99%

Quantum coherence-control of thermal energy transport: the V model as a case study

2022

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Whether genuine quantum effects, particularly quantum coherences, can offer an advantage to quantum devices is a topic of much interest. Here, we study a minimal model, the three-level V system coupled to two heat baths, and investigate the role of quantum coherences in heat transport in both the transient regime and in the nonequilibrium steady-state. In our model, energy is exchanged between the baths through two parallel pathways, which can be made distinct through the nondegeneracy of excited levels (energy splitting $\Delta$) and a control parameter $\alpha$, which adjusts the strength of one of the arms. Using a nonsecular quantum master equation of Redfield form, we succeed in deriving closed-form expressions for the quantum coherences and the heat current in the steady state limit for closely degenerate excited levels. By including three ingredients in our analysis: nonequilibrium baths, nondegeneracy of levels, and asymmetry of pathways, we show that quantum coherences are generated and sustained in the V model in the steady-state limit if three conditions, conjoining thermal and coherent effects are {\it simultaneously} met: (i) The two baths are held at different temperatures. (ii) Bath-induced pathways do not interfere destructively. (iii) Thermal rates do not mingle with the control parameter $\alpha$ to destroy interferences through an effective local equilibrium condition. Particularly, we find that coherences are maximized when the heat current is suppressed. Although we mainly focus on analytical results in the steady state limit, numerical simulations reveal that the transient behavior of coherences {\it contrasts} the steady-state limit: Large long-lived transient coherences vanish at steady state, while weak short-lived transient coherences survive, suggesting that different mechanisms are at play in these two regimes. Enhancing either the lifetime of transient coherences or their magnitude at steady state thus requires the control and optimization of different physical parameters.

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Section: Discussionmentioning

confidence: 99%

Quantum coherence-control of thermal energy transport: the V model as a case study

2022

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“…V-EIT is the least studied of these because there is no stable dark state [11], as both of the singly coupled states are excited states and can decay to the ground state. Nevertheless, V-EIT has been extensively studied [6,[12][13][14][15][16][17][18][19][20][21][22][23][24][25], and provides an interesting testing ground for ascertaining the relative importance of coherent and incoherent mechanisms in the generation of the transparency window [16,26,27].…”

Section: Introductionmentioning

confidence: 99%

Electromagnetically induced transparency in a V-system with ⁸⁷Rb vapour in the hyperfine Paschen-Back regime

Higgins

Hughes

2021

J. Phys. B: At. Mol. Opt. Phys.

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We observe electromagnetically induced transparency (EIT) in a V-system in a thermal rubidium-87 vapour in the hyperfine Paschen-Back regime, realised with a 0.6 T axial magnetic field. In this regime energy levels are no longer degenerate and EIT features from different initial states are distinct, which we show produces a much cleaner feature than without a magnetic field. We compare our results to a model using the time-dependent Lindblad master equation, and having averaged over a distribution of interaction times, see good qualitative agreement for a range of pump Rabi frequencies. Excited state decay into both ground states is shown to play a prominent role in the generation of the transparency feature, which arises mainly due to transfer of population into the ground state not coupled by the probe beam. We use the model to investigate the importance of coherence in this feature, showing that its contribution is more significant at smaller pump Rabi frequencies.

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A detailed study of the quantum coherent and saturating resonances using the hyperfine lines of rubidium

Das¹,

Dey²,

Bhattacharyya³

et al. 2019

Hyperfine Interact

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Electromagnetically induced transparency in a V-type multilevel system of Na vapor

Cited by 9 publications

References 30 publications

Quantum coherence-control of thermal energy transport: the V model as a case study

Quantum coherence-control of thermal energy transport: the V model as a case study

Electromagnetically induced transparency in a V-system with ⁸⁷Rb vapour in the hyperfine Paschen-Back regime

A detailed study of the quantum coherent and saturating resonances using the hyperfine lines of rubidium

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Electromagnetically induced transparency in a V-type multilevel system of Na vapor

Cited by 9 publications

References 30 publications

Quantum coherence-control of thermal energy transport: the V model as a case study

Quantum coherence-control of thermal energy transport: the V model as a case study

Electromagnetically induced transparency in a V-system with 87Rb vapour in the hyperfine Paschen-Back regime

A detailed study of the quantum coherent and saturating resonances using the hyperfine lines of rubidium

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Electromagnetically induced transparency in a V-system with ⁸⁷Rb vapour in the hyperfine Paschen-Back regime