We study the dynamics of quantum and classical correlations in presence nondissipative decoherence. discover a class initial states for which correlations, quantified by discord, are not destroyed decoherence times t < \bar{t}. In this time interval decay. For > \bar{t}, on other hand, do change only lost due to interaction with environment. Therefore, at transition \bar{t} open system exhibits sudden from regime.

Research on the out-of-equilibrium dynamics of quantum systems has so far produced important statements thermodynamics small undergoing mechanical evolutions. Key examples are provided by Crooks and Jarzynski relations: taking into account fluctuations in non-equilibrium dynamics, such relations connect equilibrium properties thermodynamical relevance with explicit features. Although experimental verification fundamental classical domain encountered some success, their version requires...

We propose an interferometric setting for the ancilla-assisted measurement of characteristic function work distribution following a time-dependent process experienced by quantum system. identify how configuration effective interferometer is linked to symmetries enjoyed Hamiltonian ruling and provide explicit form operations implement in order accomplish our task. finally discuss two physical settings, based on hybrid optomechanical-electromechanical devices, where theoretical proposals...

We study the exact entanglement dynamics of two qubits in a common structured reservoir. demonstrate that for certain classes entangled states, sudden death occurs, while initially factorized birth takes place. The backaction non-Markovian reservoir is responsible revivals after has occurred, and also periods disentanglement following birth.

The simulation of open quantum dynamics has recently allowed the direct investigation features system-environment interaction and their consequences on evolution a system. Such threatens properties system, spoiling them causing phenomenon decoherence. Sometimes however coherent exchange information takes place between system environment, memory effects arise becomes non-Markovian. Here we report experimental realisation non-Markovian process where environment are coupled through simulated...

We investigate the non-Markovian dynamics of two-state systems in structured reservoirs. establish a connection between two theoretical quantum approaches, pseudomodes [B. M. Garraway, Phys. Rev. A 55, 2290 (1997)] and recently developed jump method [J. Piilo et al., Lett. 100, 180402 (2008)]. This provides clear physical picture how reservoir affects system dynamics, indicating role as an effective description environmental memory.

Nonequilibrium thermodynamics is relatively common in a range of scientific fields. Scientists show that observations nonequilibrium can yield predictions quantum many-body systems.

We investigate the dynamics of quantum and classical correlations in a system two qubits under local colored-noise dephasing channels. The time evolution single qubit interacting with its own environment is described by memory kernel non-Markovian master equation. effects reservoirs introduce new features compared to white noise Markovian case. Depending on geometry initial state, can exhibit frozen discord multiple sudden transitions between decoherence [L. Mazzola, J. Piilo S. Maniscalco,...

We analyze the role played by system-environment correlations in emergence of non-Markovian dynamics. By working within framework developed Breuer et al. [Phys. Rev. Lett. 103, 210401 (2009)], we unveil a fundamental connection between behavior and dynamics correlations. derive an upper bound to rate change distinguishability different states system that explicitly depends on establishment environment. illustrate our results using fully solvable spin-chain model, which allows us gain insight...

Do phenomenological master equations with memory kernel always describe a non-Markovian quantum dynamics characterized by reverse flow of information? Is the integration over past states system an unmistakable signature non-Markovianity? We show counterexample that this is not case. consider two commonly used integro-differential describing spin 1/2 in thermal bath. By using recently introduced measure to quantify non-Markovianity [H.-P. Breuer, E.-M. Laine, and J. Piilo, Phys. Rev. Lett....

The mathematical model of suspension components in a railway vehicle may have an important effect on the results dynamics simulations and their accuracy reproducing actual behaviour. This paper aims to define compare alternative modelling approaches for secondary airspring assess rail multibody simulation. To derive reliable models suspension, quasi-static dynamic characterisation was performed by means full-scale laboratory experiment. Based this, two different were developed suspension:...

We present a scheme to prepare quantum correlated states of two mechanical systems based on the pouring preavailable all-optical entanglement into state micromirrors belonging remote and noninteracting optomechanical cavities. show that, under realistic experimental conditions, protocol allows for preparation genuine composite mesoscopic system whose nonclassical features extend beyond occurrence entanglement. finally discuss way access such correlations.

We investigate the dynamical relations among entanglement, mixedness and nonlocality, quantifed by concurrence C, purity P maximum of Bell function B, respectively, in a system two qubits common structured reservoir. To this aim we introduce C-P-B parameter space analyze time evolution point representative state such space. The interplay nonlocality strongly depends on initial system. For two-excitation draws multi-branch curve show that closed relation these quantifers does not hold. By...

We perform an extensive study of the properties global quantum correlations in finite-size one-dimensional spin models at finite temperature. By adopting a recently proposed measure for [C. C. Rulli, and M. S. Sarandy, Phys. Rev. A, 84, 042109 (2011)], called discord, we show that critical points can be neatly detected even many-body systems are not their ground state. consider transverse Ising model, cluster-Ising model where three-body couplings compete with Ising-like interaction,...

Introduction The first 90 of the 90-90-90 initiative introduced by World Health Organization(WHO) in 2015 requires 90% people with HIV be aware their status 2020. In South Africa, conventional facility-based testing had reached 84.9% 2018; innovative new methods, like self-testing(HIVST) may close gap. This study aimed to determine usability seven HIVST kits among untrained Africans. Methods cross-sectional 1400 adults Johannesburg evaluated five blood fingerstick and two oral fluid HIVSTs,...

Accurate and user-friendly rapid point-of-care diagnostic tests (POCT) are needed to optimize treatment of Neisseria gonorrhoeae , especially in low-resource settings where syndromic management is the standard care for sexually transmitted infections. This study aimed assess acceptability usability a novel lateral flow assay portable reader detection N . infection (NG-LFA). mixed-methods was conducted as part performance evaluation prototype NG-LFA symptomatic men women at primary healthcare...

This paper shows the importance of modelling components suspension when performing dynamics simulations a railway vehicle. Focusing on air spring secondary suspension, process to define an accurate component model is proposed based combination laboratory tests and identification techniques. Six models for are discussed assessed comparison with experiments.

We investigate the conditions under which trace distance between two different states of a given open system increases in time due to interaction with an environment, therefore signaling non-Markovianity. find that finite-time difference is bounded by sharply defined quantities are strictly linked occurrence system-environment correlations created throughout their and affecting subsequent evolution system. This allows us shed light on origin non-Markovian behaviors quantum dynamics. best...

Abstract Background South Africa maintains an integrated health system where syndromic management of sexually transmitted infections (STI) is the standard care. An estimated 2 million cases Neisseria gonorrhoeae (N. gonorrhoeae) occur in every year. Point-of-care diagnostic tests (POCT) may address existing STI control limitations such as overtreatment and missed cases. Subsequently, a rapid lateral flow assay with fluorescence-based detection (NG-LFA) prototype reader was developed for N....

The evaluation of a reliable validation method, criteria and limit values suitable for model in the context vehicle acceptance was one objectives DynoTRAIN project. presented investigations represent unique amount testing, simulations, comparisons with measurements, evaluations. on-track measurements performed four European countries included several different vehicles on test train equipped to simultaneously record track irregularities rail profiles. simulations were using models built use...

Considering the specific case of a concentrated power locomotive with motors mounted on bogie frame, paper reviews criteria for nonlinear assessment vehicle stability based simulation response to random track irregularity, showing need more objective than ones physical testing homologation. The effect elastic motor connection frame is examined by linear and calculations, which shows that stiffness damping properties have strong influence stability.

We study the exact entanglement and entropy dynamics of two qubits interacting with a common zero-temperature non-Markovian reservoir. It is commonly held view that loss due to environmental decoherence accompanied by purity state system. demonstrate such an intuitive picture does not always apply: deterioration necessarily come together; i.e. revivals can be purity. To complete our investigation on entanglement–mixedness interplay we consider case initial mixed states how its are related...

Mechatronic technologies are increasingly adopted on railway vehicles, with particular reference to active secondary suspensions, as a means improve vehicle performance in terms of ride safety and quality. This article presents the results theoretical experimental research aimed at introducing control capabilities pneumatic suspension high-speed vehicle. The airspring is used, together an lateral suspension, reduce passengers’ exposure acceleration curves respect overturning presence extreme...