We propose a strategy to modulate the decoherence dynamics of a two-level system, which interacts with a dissipative bosonic environment, by introducing an ancillary degree of freedom. It is revealed that the decay rate of the two-level system can be significantly suppressed under suitable steers of the assisted degree of freedom. Our result provides an alternative way to fight against decoherence and realize a controllable quantum dissipative dynamics.
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http://dx.doi.org/10.1038/s41598-021-86553-z | DOI Listing |
ACS Omega
December 2024
Department of Physics, Institute of Biosciences, Humanities and Exact Sciences, São Paulo State University (UNESP), São José do Rio Preto, 15054-000 São Paulo, Brazil.
Tunneling times were calculated in electron transfer processes using an asymmetric harmonic double-well model. The simplicity of a direct variational calculation in the approximate solution of the Schrödinger equation, along with the interpretation of tunneling times within the probabilistic framework of a two-level system, allows for the efficient and accurate determination of tunneling times with minimal computational cost. These calculations were applied to electron transfer processes in the study of the photosynthetic reaction center and in the context of catalysis in UV-induced DNA lesion repair and are in agreement with the experimental, computational, and theoretical results with which they were compared.
View Article and Find Full Text PDFNat Comput Sci
December 2024
Institute of Science and Technology for Brain-Inspired Intelligence, Fudan University, Shanghai, China.
Here we present the Digital Brain (DB)-a platform for simulating spiking neuronal networks at the large neuron scale of the human brain on the basis of personalized magnetic resonance imaging data and biological constraints. The DB aims to reproduce both the resting state and certain aspects of the action of the human brain. An architecture with up to 86 billion neurons and 14,012 GPUs-including a two-level routing scheme between GPUs to accelerate spike transmission in up to 47.
View Article and Find Full Text PDFJ Chem Phys
December 2024
Pitaevskii BEC Center, CNR-INO and Dipartimento di Fisica, Università di Trento, Via Sommarive 14, Trento I-38123, Italy.
Nonadiabatic quantum-classical mapping approaches have significantly gained in popularity over the past several decades because they have acceptable accuracy while remaining numerically tractable even for large system sizes. In the recent few years, several novel mapping approaches have been developed that display higher accuracy than the traditional Ehrenfest method, linearized semiclassical initial value representation (LSC-IVR), and Poisson bracket mapping equation (PBME) approaches. While various benchmarks have already demonstrated the advantages and limitations of those methods, unified theoretical justifications of their short-time accuracy are still demanded.
View Article and Find Full Text PDFHIV Med
December 2024
Division of Geriatric Medicine, Department of Medicine, Sinai Health System and University Health Network, Toronto, Ontario, Canada.
Objectives: HIV is often under-recognized in older individuals, particularly women, despite a significant number of new cases being diagnosed in those aged >50 years. This review aimed to understand the age-related experiences and challenges faced by women aged ≥50 years living with HIV through an intersectional perspective.
Methods: We conducted a systematic scoping review using the framework by Arksey and O'Malley, refined by Levac, Colquhoun, and Peters, and informed by a Sex- and Gender-Based Analysis Plus (SGBA+) approach.
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