Quantum measurement of a double quantum dot coupled to two kinds of environment

Kang, Lisha; Zhang, Yanhui; Xu, Xiulan; Tang, Xu

doi:10.1103/physrevb.96.235417

Cited by 16 publications

(14 citation statements)

References 55 publications

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“…The investigation on the geometric effect of dynamical evolution in a nonequilibrium environment helps us understand better the non-Markovian decoherence dynamics of open quantum systems. Within some theoretical and experimental frameworks, the phase information of quantum evolution can be measured by the interferometric measurement via nuclear magnetic resonance (NMR) or by the current measurement via a QPC device [18,32,33,69,70]. In principle, the observation of the environmental nonequilibrium feature on the geometry of dynamical evolution would be expected to be realized experimentally by using a NMR interferometry or a QPC detector based on the theoretical frameworks demonstrated in Refs.…”

Section: Discussionmentioning

confidence: 99%

Geometry of quantum evolution in a nonequilibrium environment

Meng

Zhang

et al. 2019

EPL

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We theoretically study the geometric effect of quantum dynamical evolution in the presence of a nonequilibrium noisy environment. We derive the expression of the time dependent geometric phase in terms of the dynamical evolution and the overlap between the time evolved state and initial state. It is shown that the frequency shift induced by the environmental nonequilibrium feature plays a crucial role in the geometric phase and evolution path of the quantum dynamics. The nonequilibrium feature of the environment makes the length of evolution path becomes longer and reduces the dynamical decoherence and non-Markovian behavior in the quantum dynamics.

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Section: Discussionmentioning

confidence: 99%

Geometry of quantum evolution in a nonequilibrium environment

Meng

Zhang

et al. 2019

EPL

Self Cite

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“…The loss of quantum features induced by the environments is considered as a fundamental obstacle to the construction of quantum information processors and the realization of ultrafast quantum computation. The study of decoherence and disentanglement dynamics of open quantum systems can help us further expand the understanding of the environmental effects on the dynamical evolution of the quantum systems and the real origins of the loss of quantum features and quantum-classical transition, which has potential applications in preserving quantum features against the environmental noise and in realizing quantum manipulation and control and quantum measurement [ 7 , 8 , 9 , 10 , 11 , 12 , 13 , 14 , 15 , 16 , 17 , 18 , 19 , 20 , 21 , 22 ].…”

Section: Introductionmentioning

confidence: 99%

Disentanglement Dynamics in Nonequilibrium Environments

Chen

Han

et al. 2022

Entropy

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We theoretically study the non-Markovian disentanglement dynamics of a two-qubit system coupled to nonequilibrium environments with nonstationary and non-Markovian random telegraph noise statistical properties. The reduced density matrix of the two-qubit system can be expressed as the Kraus representation in terms of the tensor products of the single qubit Kraus operators. We derive the relation between the entanglement and nonlocality of the two-qubit system which are both closely associated with the decoherence function. We identify the threshold values of the decoherence function to ensure the existences of the concurrence and nonlocal quantum correlations for an arbitrary evolution time when the two-qubit system is initially prepared in the composite Bell states and the Werner states, respectively. It is shown that the environmental nonequilibrium feature can suppress the disentanglement dynamics and reduce the entanglement revivals in non-Markovian dynamics regime. In addition, the environmental nonequilibrium feature can enhance the nonlocality of the two-qubit system. Moreover, the entanglement sudden death and rebirth phenomena and the transition between quantum and classical nonlocalities closely depend on the parameters of the initial states and the environmental parameters in nonequilibrium environments.

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“…A quantum system loses coherence information in its dynamic evolution resulting from the inevitable environmental coupling. ,, A better understanding of the dynamics of open quantum systems is paramount to preventing or controlling quantum decoherence and the so-called quantum to classical transition. − Experimental results reported during the last decade or so give supporting evidence that electronic quantum coherence aid in the efficient transport of energy and charge from light-harvesting antennas to photosynthetic reaction centers in biological systems, even when incoherent natural light is used as a source of excitation. − …”

Section: Introductionmentioning

confidence: 99%

Molecular Structure, Quantum Coherence, and Solvent Effects on the Ultrafast Electron Transport in BODIPY–C₆₀ Derivatives

Madrid-Úsuga

Reina

2021

J. Phys. Chem. A

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Photoinduced electron transfer in multichromophore molecular systems is defined by a critical interplay between their core unit configuration (donor, molecular bridge, and acceptor) and their system–solvent coupling; these lead to energy and charge transport processes that are key in the design of molecular antennas for efficient light harvesting and organic photovoltaics. Here, we quantify the ultrafast non-Markovian dissipative dynamics of electron transfer in D−π–A molecular photosystems comprising 1,3,5,7-tetramethyl-8-phenyl-4,4-difluoroboradiazaindacene (BODIPY), Zn–porphyrin, fulleropyrrolidine, and fulleroisoxazoline. We find that the stabilization energy of the charge transfer states exhibits a significant variation for different polar (methanol, tetrahydrofuran (THF)) and nonpolar (toluene) environments and determine such sensitivity according to the molecular structure and the electron–vibration couplings that arise at room temperature. For the considered donor–acceptor (D–A) dyads, we show that the stronger the molecule–solvent coupling, the larger the electron transfer rates, regardless of the dyads’ electronic coherence properties. We find such coupling strengths to be the largest (lowest) for methanol (toluene), with an electron transfer rate difference of 2 orders of magnitude between the polar and nonpolar solvents. For the considered donor–bridge–acceptor (D–B–A) triads, the molecular bridge introduces an intermediate state that allows the realization of Λ or cascaded-type energy mechanisms. We show that the latter configuration, obtained for BDP-ZnP-[PyrC60] in methanol, exhibits the highest transfer rate of all of the computed triads. Remarkably, and in contrast with the dyads, we show that the larger charge transfer rates are obtained for triads that exhibit prolonged electron coherence and population oscillations.

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Quantum measurement of a double quantum dot coupled to two kinds of environment

Cited by 16 publications

References 55 publications

Geometry of quantum evolution in a nonequilibrium environment

Geometry of quantum evolution in a nonequilibrium environment

Disentanglement Dynamics in Nonequilibrium Environments

Molecular Structure, Quantum Coherence, and Solvent Effects on the Ultrafast Electron Transport in BODIPY–C₆₀ Derivatives

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Quantum measurement of a double quantum dot coupled to two kinds of environment

Cited by 16 publications

References 55 publications

Geometry of quantum evolution in a nonequilibrium environment

Geometry of quantum evolution in a nonequilibrium environment

Disentanglement Dynamics in Nonequilibrium Environments

Molecular Structure, Quantum Coherence, and Solvent Effects on the Ultrafast Electron Transport in BODIPY–C60 Derivatives

Contact Info

Product

Resources

About

Molecular Structure, Quantum Coherence, and Solvent Effects on the Ultrafast Electron Transport in BODIPY–C₆₀ Derivatives