We analyze the optimal measurements accessing classical correlations in arbitrary two-qubit states. Two-qubit states can be transformed into canonical forms via local unitary operations. For forms, we investigate probability distribution of measurements. The measurement is found to centralized vicinity a specific von Neumann measurement, which call maximal-correlation-direction (MCDM). prove that for with zero-discord and maximally mixed marginals, MCDM very measurement. Furthermore, give an...

We derive a set of hierarchical equations for qubits interacting with Lorentz-broadened cavity mode at zero temperature, without using the rotating-wave, Born, and Markovian approximations. use this exact method to reexamine entanglement dynamics two common bath, which was previously solved only under rotating-wave single-excitation With hierarchy equation used here, double excitations due counter-rotating-wave terms are found have remarkable effects on steady-state entanglement.

We study the Förster resonant energy transfer rate, absorption and emission spectra in multichromophoric systems. The theory (MCFT) is determined from an overlap integral of generalized matrices related to donor's acceptor's spectra, which are obtained via a full 2nd-order cumulant expansion technique developed this work. calculate MCFT rate for both localized delocalized systems, calibrate analytical with exact stochastic path method. present three essential findings: (i) role initial...

Following the calculation of optimal energy transfer in thermal environment our first paper [J. L. Wu, F. Liu, Y. Shen, J. S. Cao, and R. Silbey, New Phys. 12, 105012 (2010)], full quantum dynamics leading-order "classical" hopping kinetics are compared seven-site Fenna-Matthews-Olson (FMO) protein complex. The difference between these two dynamic descriptions is due to higher-order corrections. Two bath models, classical white noise (the Haken-Strobl-Reineker (HSR) model) Debye model,...

We derive an easily computable quantum speed limit (QSL) time bound for open systems whose initial states can be chosen as either pure or mixed states. Moreover, this QSL is applicable to Markovian non-Markovian dynamics. By using of a hierarchy equation method, we numerically study the in qubit system interacting with single broadened cavity mode without rotating-wave, Born and approximation. comparing rotating-wave approximation (RWA) results, show that counter-rotating terms are helpful...

Inducing TiO2 sensitive to visible light and effectively restraining the possibility of electron–hole recombination are crucial for actual applications over TiO2-based catalysts. In this study, a facile strategy fabricate three-dimensional (3D) defective TiO2–x@carbon spheres (CSs) composite modified with two-dimensional (2D) graphite-like carbon nitride (g-C3N4) nanosheets (NSs) is presented. During synthesis process, zero-dimensional tiny TiO2–x nanoparticles were evenly loaded onto CSs...

A numerically exact path integral treatment of the absorption and emission spectra open quantum systems is presented that requires only straightforward solution a stochastic differential equation. The approach converges rapidly enabling calculation large excitonic across complete range system parameters for arbitrary bath spectral densities. With operators one can also immediately compute energy transfer rates using multi-chromophoric Forster resonant formalism. Benchmark calculations on two...

We develop a hybrid cumulant expansion method to account for the system-bath entanglement in emission spectrum multi-chromophoric Förster transfer rate. In traditional perturbative treatments, is usually expanded with respect coupling term both real and imaginary time. This treatment gives reliable absorption spectrum, where bath Gaussian only real-time involved. For initial state an entangled of system plus bath. Traditional methods are problematic when excitations delocalized energy gap...

Graphitic C₃N₄ nanosheet with 2D structure can effectively sensitize brookite TiO₂ for photocatalytic H₂ evolution under visible light irradiation.

We investigate a Landau-Zener (LZ) transition process modeled by quantum two-level system (TLS) coupled to photon mode when the bias energy is varied linearly in time. The initial state of field assumed be superposition coherent states, leading more intricate LZ transition. Applying rotating-wave approximation (RWA), analytical results are obtained revealing enhancement probability increasing average number. also consider creation entanglement and change statistics during process. Without...

ABSTRACT BACKGROUND The separation of methanol–toluene by introducing aniline or triethylamine ( Et3N ) is investigated, with and as heavy intermediate entrainers, respectively. First, the conventional extractive distillation process entrainer HE direct/indirect separating sequences using IE ‐D/ ‐I) have been designed optimized rigorous simulations. Subsequently, dynamic performances these processes are investigated simple temperature control strategies. Finally, steady‐state economics for...

The heterogeneous azeotropic dividing-wall column (ADWC) features significant reduction of capital investment and energy consumption. Conventional distillation sequences can be thermally coupled into two types configurations ADWCs, namely, the original ADWC with simple azeotropic–recovery section other recovery also serving as preconcentrator. a combined recovery–preconcentrator has been investigated in both steady-state design dynamic controllability. However, only proven to more efficient...

In extractive distillation, an intermediate entrainer that differently interacts with the azeotropic components can be introduced. this work, separation system of methanol–toluene has been investigated to evaluate performance conventional distillation (CED) and corresponding dividing wall column (DWC) by using entrainer. First, sequences including direct sequence (DS) indirect (IS) are investigated. It is indicated DS provides much more energy saving investment reduction, while exhibits...

Solar-to-chemical energy conversion is a challenging photochemical reaction for renewable storage. In recent decades, photocatalytic H2 evolution has been studied extensively. TiO2 well-established semiconductor in the field of production; however, its low efficiency solar utilization, and high photocarrier recombination rate, restrict efficiency. Here, series K-intercalated g-C3N4-modified nanobelts (TCN-Kx) with different dosages K atoms were fabricated using hydrothermal method followed...