- 标题
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- 实验方案
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Nonlinear Langevin dynamics via holography
摘要： In this work, we consider non-linear corrections to the Langevin effective theory of a heavy quark moving through a strongly coupled CFT plasma. In AdS/CFT, this system can be identified with that of a string stretched between the boundary and the horizon of an asymptotically AdS black brane solution. We compute the Feynman-Vernon influence phase for the heavy quark by evaluating the Nambu-Goto action on a doubled string configuration. This configuration is the linearised solution of the string motion in the doubled black brane geometry which has been proposed as the holographic dual of a thermal Schwinger-Keldysh contour of the CFT. Our expression for the influence phase passes non-trivial consistency conditions arising from the underlying unitarity and thermality of the bath. The local effective theory obeys the recently proposed non-linear fluctuation dissipation theorem relating the non-Gaussianity of thermal noise to the thermal jitter in the damping constant. This furnishes a non-trivial check for the validity of these relations derived in the weak coupling regime.
关键词： AdS-CFT Correspondence,Holography and quark-gluon plasmas,Quantum Dissipative Systems
更新于2025-09-23 15:21:01
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Quantum jump statistics with a shifted jump operator in a chiral waveguide
摘要： Resonance ?uorescence, consisting of light emission from an atom driven by a classical oscillating ?eld, is well-known to yield a sub-Poissonian photon counting statistics. This occurs when only emitted light is detected, which corresponds to a master equation (ME) unraveling in terms of the canonical jump operator describing spontaneous decay. Formally, an alternative ME unraveling is possible in terms of a shifted jump operator. We show that this shift can result in sub-Poissonian, Poissonian or super-Poissonian quantum jump statistics. This is shown in terms of the Mandel Q parameter in the limit of long counting times, which is computed through large deviation theory. We present a waveguide-QED setup, comprising a chiral waveguide coupled to a driven atom, where photon counting is described by the considered class of shifted jump operators.
关键词： correlation functions,dissipative systems
更新于2025-09-23 15:19:57
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Transmission spectra of an ultrastrongly coupled qubit-dissipative resonator system
摘要： We calculate the transmission spectra of a flux qubit coupled to a dissipative resonator in the ultrastrong coupling regime. Such a qubit-oscillator system constitutes the building block of superconducting circuit QED platforms. The calculated transmission of a weak probe field quantifies the response of the qubit, in frequency domain, under the sole influence of the oscillator and of its dissipative environment, an Ohmic heat bath. We find the distinctive features of the qubit-resonator system, namely two-dip structures in the calculated transmission, modified by the presence of the dissipative environment. The relative magnitude, positions, and broadening of the dips are determined by the interplay among qubit-oscillator detuning, the strength of their coupling, and the interaction with the heat bath.
关键词： quantum computation,quantum dissipative systems
更新于2025-09-23 15:19:57
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On the lack of intrinsic bistability of photon emission in a double quantum dot micromaser
摘要： We study a micromaser model based on a solid-state setup with a double quantum dot coupled to a microwave cavity. This model relevant for description of existing experimental setups was used previously and predicted bistable photon emission. Here we revisit the model with the focus on the bistability of the emission process and using a recently developed theory of quantum metastability we come to the conclusion that in fact it does not feature any bistable behavior. We analyze in detail the method of full counting statistics used for the prediction of the bistability applying it to a simple electronic model and identify a likely cause behind its failure, namely, the large ambiguity of the fitting procedure.
关键词： quantum dots,large deviations in non-equilibrium systems,quantum dissipative systems,metastable states
更新于2025-09-16 10:30:52
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[IEEE 2019 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC) - Munich, Germany (2019.6.23-2019.6.27)] 2019 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC) - Nonlinear Fourier Transform for Analysis of Coherent Structures in Dissipative Systems
摘要： The conventional Fourier transform is widely used mathematical methods in science and technology. It allows representing the signal/field under study as a set of spectral harmonics, that it many situations simplify understanding of such signal/field. In some linear equations, where spectral harmonics evolve independently of each other, the Fourier transform provides a straightforward description of otherwise complex dynamics. Something similar is available for certain classes of nonlinear equations that are integrable using the inverse scattering transform [1, 2], also known as the nonlinear Fourier transform (NFT). Here we discuss potential of its application in dissipative, non-integrable systems to characterize coherent structures. We present a new approach for describing the evolution of a nonlinear system considering the cubic Ginzburg-Landau Equation (CGLE) as a particularly important example in the context of laser system modeling.
关键词： Coherent Structures,Ginzburg-Landau Equation,Dissipative Systems,Nonlinear Fourier Transform
更新于2025-09-11 14:15:04
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Active structuring of colloids through field-driven self-assembly
摘要： In recent years self-assembly has become progressively more “active”, i.e. the focus of research gradually has shifted towards field-manipulation of matter in order to form temporary states rather than creating static architectures. The desire for time-programmed control of materials certainly originates from the unmatched complexity of natural systems that orchestrate multiple components across length scales. Although artificial self-assembly still lacks control comparable to natural systems, there has been impressive progress in a concerted approach from physicists, chemists, biologists, and engineers. This review summarizes the current trend in colloidal assembly advancing from static assembly of isotropic particles towards active structuring of anisotropic particles with heterogeneous (patchy) surfaces, and ultimately, to complex behavior in dissipative dynamic systems. We focus both on the formation of static structures and on temporary states due to response to magnetic, electric, or optic stimulation. We give examples of nano- and microparticle assembly where the temporary state may adopt equilibrium order or a continuously changing dynamic pattern.
关键词： Dissipative systems,Self-assembly,Colloids,External fields,Patchy particles
更新于2025-09-10 09:29:36