We show the existence of an entangled nonequilibrium state at very high temperatures when two linearly coupled harmonic oscillators are parametrically driven and dissipate into independent heat baths. This result has a twofold meaning: first, it fundamentally shifts classical-quantum border to as our experimental ability allows us, second, can help increase by least one order magnitude temperature which current setups operated.

The physical basis for observed long-lived electronic coherence in photosynthetic light-harvesting systems is identified using an analytically soluble model. Three features are found to be responsible their long lifetimes, (i) the small energy gap between excitonic states, (ii) ratio of coupling and (iii) fact that molecular characteristics place system effective low-temperature regime, even at ambient conditions. Using this approach, we obtain decoherence times a dimer model with FMO...

Under natural conditions, excitation of biological molecules, which display nonunitary open system dynamics, occurs via incoherent processes such as temperature changes or irradiation by sunlight moonlight. The dynamics is explored analytically in a non-Markovian generic model. Specifically, S equilibrium with thermal bath TB subjected to an external perturbation BB (such sunlight) another TB${}^{\ensuremath{'}}$, induces time evolution ($\text{S}+\text{TB}$). Particular focus on (i) the...

A sideband cooling strategy that incorporates (i) the dynamics induced by structured (non-Markovian) environments in target and auxiliary systems (ii) optimally time-modulated interaction between them is developed. For context of cavity optomechanics, when non-Markovian are considered system, ground state reached at much faster rates a lower phonon occupation number than previously reported. In contrast to similar current strategies, here for coupling-strength experimentally accessible...

Synchronization is a ubiquitous phenomenon occurring in social, biological, and technological systems when the internal rythms of their constituents are adapted to be unison as result coupling. This natural tendency towards dynamical consensus has spurred large body theoretical experimental research recent decades. The Kuramoto model constitutes most studied paradigmatic framework which study synchronization. In particular, it shows how synchronization appears phase transition from...

The nature of excited states open quantum systems produced by incoherent natural thermal light is analyzed based on a description the dynamical map. Natural shown to generate long-lasting coherent dynamics because (i) super-Ohmic character radiation, and (ii) absence pure dephasing dynamics. In presence an environment, coherences induced suddenly turned-on dissipate stationary are established. As particular application, in subunit PC645 light-harvesting complex considered where it further...

We predict that an ensemble of organic dye molecules with permanent electric dipole moments embedded in a microcavity can lead to strong optical nonlinearities at the single-photon level. The long-range electrostatic interaction between chromophores due their dipoles introduces desired nonlinearity light–matter coupling microcavity. develop semiclassical model obtain absorption spectra weak probe field under influence exciton–photon cavity field. Using realistic parameters, we demonstrate...

The interplay between non-Markovian dynamics and driving fields in the survival of entanglement two non-degenerate oscillators is considered here. Based on exact analytical results for parametrically coupled contact to non-identical independent thermal baths, out-of-equilibrium quantum limit derived [Phys. Rev. Lett. 105, 180501 (2010)] generalized regime. Specifically, it shown that dynamics, when compared Markovian case, allow stationary at higher temperatures, with larger coupling...

The recent gravitational wave observations by the LIGO/Virgo collaboration have allowed first tests of General Relativity in extreme gravity regime, when comparable-mass black holes and neutron stars collide. Future space-based detectors, such as Laser Interferometer Space Antenna, will allow Einstein's theory with waves emitted a small hole falls into supermassive one an mass-ratio inspiral. One particular test that is tailor-made for inspirals search chaos gravity. We here study whether...

$Q_\beta$ represents one of the most important factors characterizing unstable nuclei, as it can lead to a better understanding nuclei behavior and origin heavy atoms. Recently, machine learning methods have been shown be powerful tool increase accuracy in prediction diverse atomic properties such energies, charges, volumes, among others. Nonetheless, these are often used black box not allowing unraveling insights into phenomena under analysis. Here, state-of-the-art precision $\beta$-decay...

A new six-parametric, axisymmetric, and asymptotically flat exact solution of Einstein-Maxwell field equations having reflection symmetry is presented. It has arbitrary physical parameters mass, angular momentum, mass-quadrupole moment, current octupole electric charge, magnetic dipole, so it can represent the exterior a rotating, deformed, magnetized, charged object; some properties closed-form analytic such as its multipolar structure, electromagnetic fields, singularities are also In...

The ability of an environment to assist in one-photon phase control relies upon entanglement between the system and bath on breaking time reversal symmetry. Here, is examined analytically numerically a model system, allowing analysis relative strength these contributions. Further, significant role non-Markovian dynamics moderate system-bath coupling enhancing demonstrated, explicit for quantum mechanics noted existence initial non-zero stationary coherences. Finally, desirable conditions are...

We present a general study about the relation between vorticity tensor and Poynting vector of electromagnetic field for axially symmetric stationary electrovacuum metrics.The obtained expressions allow to understand role in dragging inertial frames.The particular case rotating massive charged magnetic dipole is analyzed detail.In addition, electric parts Weyl are calculated link later established.Then we show that, vacuum case, necessary sufficient condition vanishing part that spacetime be static.

The existence of chaotic behavior for the geodesics test particles orbiting compact objects is a subject much current research. Some years ago, Gu\'eron and Letelier [Phys. Rev. E \textbf{66}, 046611 (2002)] reported like black holes induced by specific values quadrupolar deformation source using as models Erez--Rosen solution Kerr hole deformed an internal multipole term. In this work, we are interesting in study dynamic around astrophysical with intrinsic or nonisotropic stresses, which...

We present a comprehensive study of semiclassical phase-space propagation in the Wigner representation, emphasizing numerical applications, particular as an initial-value representation. Two approximation schemes are discussed. The propagator function based on van Vleck’s replaces Liouville by quantum spot with oscillatory pattern reflecting interference between pairs classical trajectories. Employing path integration instead, caustics resolved terms Airy functions. apply both to two...

The underlying mechanisms for one photon phase control are revealed through a master equation approach. Specifically, two identified, operating on the laser time scale and other of system-bath interaction. effect secular non-secular Markovian approximations carefully examined.

Reconstruction of the dynamics (quantum process tomography) single-exciton manifold in energy transfer systems is proposed here on basis two-dimensional fluorescence spectroscopy (2D-FS) with phase-modulation. The quantum-process-tomography protocol introduced benefits from, e.g., sensitivity enhancement ascribed to 2D-FS. Although isotropically averaged spectroscopic signals depend quantum yield parameter Γ doubly excited-exciton manifold, it shown that reconstruction insensitive this...

We consider the general open system problem of a charged quantum oscillator confined in harmonic trap, whose frequency can be arbitrarily modulated time, that interacts with both an incoherent quantized (blackbody) radiation field and arbitrary coherent laser field. assume is initially thermodynamic equilibrium its environment, non-factorized initial density matrix at $t=0$ modulation frequency, coupling to are switched on. The subsequent dynamics, induced by presence blackbody field,...

A classical formulation of the quantum multichromophoric theory resonance energy transfer is developed on basis electrodynamics. The allows for identification a variety processes different order in interactions that contribute to molecular aggregates with intracoupling donors and acceptor chromophores. Enhanced rates are shown be well described by this theory. Specifically, coupling configuration between ${N}_{A}$ acceptors ${N}_{D}$ donors, correctly predicts an enhancement rate dependent...

Determining the spectral density of a molecular system immersed in proteomic scaffold and contact to solvent is fundamental challenge coarse-grained description of, e.g., electron energy transfer dynamics. Once characterized, all time scales are captured no artificial separation between fast slow processes need be invoked. Based on fluorescence Stokes shift function, we utilize simple robust strategy extract number complexes from available experimental data. Specifically, show that data for...

Interaction between a quantum system and its environment can induce stationary coherences---off-diagonal elements in the reduced density matrix energy eigenstate basis---even at equilibrium. This work investigates ``quantumness'' of such phenomena by examining ability classical semiclassical models to describe equilibrium coherence multilevel spin boson model, common model for light-harvesting systems. A well justified harmonic-oscillator is found fail capture coherence. failure attributed...

Contrary to the conventional wisdom that deviations from standard thermodynamics originate strong coupling bath, it is shown in quantum mechanics, these uncertainty principle and are supported by non-Markovian character of dynamics. Specifically, lower bound dispersion total energy system, imposed principle, dominated bath power spectrum; therefore, mechanics inhibits system thermal-equilibrium-state being described canonical Boltzmann’s distribution. We show for a wide class systems,...