Quantum enhancement of qutrit dynamics through driving field and photonic-band-gap crystal

Yousefi, Negar Nikdel; Mortezapour, Ali; Naeimi, Ghasem; Nosrati, Farzam; Pariz, Aref; Franco, Rosario Lo

doi:10.1103/physreva.105.042212

Cited by 4 publications

(3 citation statements)

References 108 publications

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“…Classical control is indeed an effective method to harness the dynamics of open quantum systems and as a result quantum resources. [45,21,[78][79][80][81][82][83][84][85] In this study, we consider a classically driven two-level quantum dot (qubit) placed in a semi-infinite one-dimensional (1D) photonic crystal (PC) waveguide as an engineered environment to find the conditions under which the quantum properties of interest are optimized. In particular, we assess the impact of both the driving laser field and waveguide length on the time evolution of quantum QFI of the qubit and the geometric phase.…”

Section: Introductionmentioning

confidence: 99%

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Coherent Control of the Dynamics of Quantum Fisher Information and Geometric Phase in a 1D Photonic Crystal Waveguide

Yousefi,

Mortezapour

2024

Annalen der Physik

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It is aimed to study a hybrid quantum‐classical system in which a qubit as a quantum system coupled to a semi‐infinite 1D photonic crystal (PC) waveguide, and is controlled by a classical driving field. PC waveguides with engineering capability serve as engineered reservoirs where various manifestations of quantum mechanics can be studied. Here, the main purpose of the study is to evaluate the effect of coherent control on the dynamics of quantum Fisher information (QFI) and geometric phase (GP). It is revealed that the intensity (the Rabi frequency) of the classical field, memory time, and geometric length of the waveguide are key variables whose judicious choice aids in optimizing the estimation of the quantum parameters that are initially encoded in the qubit state. It is observed that the optical length of the waveguide and the Rabi frequency of the classical field have an interplay effect on the dynamic of the QFI and geometric phase. As an interesting finding, it is disclosed that as the Rabi frequency increases, the effect of the optical length of the waveguide fades away, and the Rabi frequency solely controls the geometric phase. Moreover, it is demonstrated that the estimation accuracy increases as the memory time decreases. On the other hand, lengthening the memory time lessens the dependency of the geometric phase on the length of the waveguide.

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Section: Introductionmentioning

confidence: 99%

“…Classical control is indeed an effective method to harness the dynamics of open quantum systems and as a result quantum resources. [ 45 , 21 , 78–85 ]…”

Section: Introductionmentioning

confidence: 99%

Coherent Control of the Dynamics of Quantum Fisher Information and Geometric Phase in a 1D Photonic Crystal Waveguide

Yousefi,

Mortezapour

2024

Annalen der Physik

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“…Quantum coherences were demonstrated to be sustained in the steady-state limit once the V model was coupled to nonequilibrium reservoirs or when detailed balance was broken by other means [35,53,[60][61][62][63][64][65]. In both transient and steady state regimes, coherences can be generated due to incoherent processes instead of benefiting from coherent sources such as laser [66] or cavity confinement [67], in which case transfer of coherence (e.g. from the laser to the system) more appropriately describes the phenomenon.…”

Section: Introductionmentioning

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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High-dimensional entanglement dynamics of two three-level giant atoms coupling to a one-dimensional waveguide

Ma,

Quan,

et al. 2024

Eur. Phys. J. D

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Quantum enhancement of qutrit dynamics through driving field and photonic-band-gap crystal

Cited by 4 publications

References 108 publications

Coherent Control of the Dynamics of Quantum Fisher Information and Geometric Phase in a 1D Photonic Crystal Waveguide

Coherent Control of the Dynamics of Quantum Fisher Information and Geometric Phase in a 1D Photonic Crystal Waveguide

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

High-dimensional entanglement dynamics of two three-level giant atoms coupling to a one-dimensional waveguide

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