We introduce a novel minimally disturbing method for sub-nK thermometry in Bose-Einstein condensate (BEC). Our technique is based on the Bose polaron model; namely, an impurity embedded BEC acts as thermometer. propose to detect temperature fluctuations from measurements of position and momentum impurity. Crucially, these cause minimal backaction hence, realize nondemolition measurement. Following paradigm emerging field quantum thermometry, we combine tools parameter estimation theory open...

During the last decades, macroecology has identified broad-scale patterns of abundances and diversity microbial communities put forward some potential explanations for them. However, these advances are not paralleled by a full understanding dynamical processes behind In particular, abundance fluctuations different species found to be correlated, both across time in metagenomic samples. Reproducing such correlations through appropriate population models remains an open challenge. The present...

We study the dynamics of a quantum impurity immersed in Bose-Einstein condensate as an open system framework Brownian motion model. derive generalized Langevin equation for position impurity. The is integrodifferential that contains memory kernel and driven by colored noise. These result from considering environment given degrees freedom gas, thus depend on its parameters, e.g. interaction strength between bosons, temperature, etc. role When untrapped, we find it exhibits super-diffusive...

Objectivity constitutes one of the main features macroscopic classical world. An important aspect quantum-to-classical transition issue is to explain how such a property arises from microscopic quantum Recently, within framework open systems, there has been proposed mechanism in terms the, so-called, Spectrum Broadcast Structures. These are multipartite states system interest and part its environment, assumed be under an observation. This approach requires departure standard systems methods,...

We analyze the microscopic model of quantum Brownian motion, describing a particle interacting with bosonic bath through coupling which is linear in creation and annihilation operators bath, but may be nonlinear function position particle. Physically, this corresponds to configuration damping diffusion are spatially inhomogeneous. derive systematically master equation for Born-Markov approximation we discuss appearance additional terms, various polynomials forms coupling. cases quadratic...

We study the dynamics of an impurity embedded in a trapped Bose-Einstein condensate, i.e., Bose polaron problem. This problem is treated by recalling open quantum systems techniques: corresponds to particle performing Brownian motion, while excitation modes gas play role environment. It crucial that model considers parabolic trapping potential resemble experimental conditions. Thus, we detail here how formal derivation changes due trap, comparison homogeneous gas. More importantly, elucidate...

We study entanglement and squeezing of two uncoupled impurities immersed in a Bose-Einstein condensate. treat them as quantum Brownian particles interacting with bath composed the Bogoliubov modes The Langevin-like stochastic equations derived exhibit memory effects. scenarios: (i) In absence an external potential, we observe sudden death entanglement; (ii) presence harmonic survives even at asymptotic time limit. Our considers experimentally tunable parameters.

During the last decades, study of cities has been transformed by new approaches combining engineering and complexity sciences. Network theory is playing a central role, facilitating quantitative analysis crucial urban dynamics, such as mobility, city growth, or planning. In this work we focus on spatial aspects congestion. Analyzing large amount real networks, show that location onset congestion changes according to considered area, defining, in turn, set regimes separated abrupt...

We introduce a comprehensive analytical benchmark, relying on Fokker-Planck formalism, to study microbial dynamics in the presence of both biotic and abiotic forces. In equilibrium, we observe balance between two kinds forces, leading no correlations species abundances. This implies that real microbiomes, where have been observed, operate out equilibrium. Therefore, analyze nonequilibrium dynamics, presenting an ansatz for approximate solution embodies complex interplay forces system. is...

The theory of quantum Brownian motion describes the properties a large class open systems. Nonetheless, its description in terms Born-Markov master equation, widely used literature, is known to violate positivity density operator at very low temperatures. We study an extension existing models, leading equation Lindblad form, which free this problem. dynamics model, including detailed stationary solution, for both constant and position-dependent coupling particle bath, focusing particular on...

We revisit decoherence process of a qubit register interacting with thermal bosonic bath. generalize the previous studies by considering not only register's behavior but also part its environment. In particular, we are interested in information flow from to environment, which describe using recently introduced multipartite quantum state structures called Spectrum Broadcast Structures. Working two specific cases of: i) two-qubit and ii) collective decoherence, identify regimes where...

We introduce a comprehensive analytical benchmark, relying on Fokker-Planck formalism, to study microbial dynamics in presence of both biotic and abiotic forces. In equilibrium, we observe balance between the two kinds forces, leading no correlations species abundances. This implies that real microbiomes, where have been observed, operate out equilibrium. Therefore, analyze non-equilibrium dynamics, presenting an ansatz for approximate solution embodies complex interplay forces system. is...

The discourse surrounding the structural organization of mutualistic interactions mostly revolves around modularity and nestedness. former is known to enhance stability communities, while latter related their feasibility, albeit compromising stability. However, it has recently been shown that joint emergence these structures poses challenges can eventually lead limitations in dynamic properties communities. We hypothesize considering compound arrangements -- modules with internal nested...

We investigate new features, especially of entanglement dynamics, which arise in a quantum-classical hybrid.As model, we study the coupling between two quantum mechanical two-level systems, i.e. q-bits, and classical harmonic oscillator.Their interaction is described by hybrid coupling, accordance with recently developed theory.We discuss various situations q-bits does (not) evolve.Furthermore, point out an experimental application cooling scheme indicate topics for future study.

We reanalyze the optomechanical interferometer experiment proposed by Marshall et al. [Phys. Rev. Lett. 91, 130401 (2003)] with help of a recently developed quantum-classical hybrid theory. This leads to an alternative evaluation mirror-induced decoherence. Surprisingly, we find that it behaves essentially in same way for suitable initial conditions and experimentally relevant parameters, no matter whether mirror is considered classical or quantum-mechanical object. discuss parameter ranges...

We investigate the growth dynamics of microbial populations, challenging conventional logistic model. By analyzing empirical data from various biomes, we demonstrate that is better described by a generalized model, θ -logistic This model accounts for different mechanisms and environmental fluctuations, leading to gamma distribution abundance fluctuations. Our findings reveal never sublinear, so they cannot endorse—at least in world—the recent proposal this mechanism as stability enhancer...

Abstract The quantitative study of traffic dynamics is crucial to ensure the efficiency urban transportation networks. current work investigates spatial properties congestion, that is, we aim characterize city areas where bottlenecks occur. analysis a large amount real road networks in previous works showed congestion points experience abrupt transitions, namely they shift away from center as larger are incorporated. fundamental ingredient behind this effect entanglement central and arterial...

Perhaps the largest debate in network Ecology, emergence of structural patterns stands out as a multifaceted problem. To methodological challenges -- pattern identification, statistical significance one has to add relationship between candidate architectures and dynamical performance. In case mutualistic communities, revolves mostly around two arrangements (nestedness modularity) requirements for persistence, namely feasibility stability. So far, it is clear that former strongly related...

The impact of Machine Learning (ML) algorithms in the age big data and platform capitalism has not spared scientific research academia. In this work, we will analyse use ML fundamental physics its relationship to other cases that directly affect society. We deal with different aspects issue, from a bibliometric analysis publications, detailed discussion literature, an overview on productive working context inside outside be conducted basis three key elements: non-neutrality science,...