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We derive a universal bound on the large-deviation functions of particle currents in coherent conductors. This bound depends only on the mean value of the relevant current and the total rate of entropy production required to maintain a…

统计力学 · 物理学 2025-10-24 Kay Brandner , Keiji Saito

In the framework of the Heisenberg picture, an alternative derivation of the reduced density matrix of a driven dissipative quantum harmonic oscillator as the prototype of an open quantum system is investigated. The reduced density matrix…

量子物理 · 物理学 2019-11-14 Fardin Kheirandish

Accurately modelling many-body quantum transport systems poses a challenge both conceptually and computationally due to the growth of the Hilbert space and the multi-scale nature of the geometries and couplings present in most naturally…

量子物理 · 物理学 2026-05-06 Adam Burgess , Nicholas Werren , Erik M. Gauger

A microscopic analysis of the superconducting quantum critical point realized via a pair-breaking quantum phase transition is presented. Finite temperature crossovers are derived for the electrical conductivity, which is a key probe of…

超导电性 · 物理学 2007-09-19 N. Shah , A. V. Lopatin

To advance hierarchial equations of motion as a standard theory for quantum dissipative dynamics, we put forward a mixed Heisenberg--Schrodinger scheme with block-matrix implementation on efficient evaluation of nonlinear optical response…

化学物理 · 物理学 2015-05-30 Jian Xu , Rui-Xue Xu , Darius Abramavicius , Houdao Zhang , YiJing Yan

Steady non-equilibrium states are investigated in a one-dimensional setup in the presence of two thermodynamic currents. Two paradigmatic nonlinear oscillators models are investigated: an XY chain and the discrete nonlinear Schr\"odinger…

统计力学 · 物理学 2016-08-24 S. Iubini , S. Lepri , R. Livi , A. Politi

This article proposes a Variational Quantum Algorithm to solve linear and nonlinear thermofluid dynamic transport equations. The hybrid classical-quantum framework is applied to problems governed by the heat, wave, and Burgers' equation in…

量子物理 · 物理学 2025-11-06 Sergio Bengoechea , Paul Over , Dieter Jaksch , Thomas Rung

In this work a practical scheme is developed for the first-principles study of time-dependent quantum transport. The basic idea is to combine the transport master-equation with the well-known time-dependent density functional theory. The…

介观与纳米尺度物理 · 物理学 2013-12-16 Xin-Qi Li , YiJing Yan

We derive a quantum master equation to treat quantum systems interacting with multiple reservoirs. The formalism is used to investigate atomic transport across a variety of lattice configurations. We demonstrate how the behavior of an…

量子物理 · 物理学 2015-05-19 R. A. Pepino , J. Cooper , D. Meiser , D. Z. Anderson , M. J. Holland

By using a correlated projection operator, the time-convolutionless (TCL) method to derive a quantum master equation can be utilized to investigate the transport behavior of quantum systems as well. Here, we analyze a three-dimensional…

量子物理 · 物理学 2008-01-18 Hendrik Weimer , Mathias Michel , Jochen Gemmer , Günter Mahler

Heat transport in open quantum systems is particularly susceptible to the modeling of system-reservoir interactions. It thus requires to consistently treat the coupling between a quantum system and its environment. While perturbative…

统计力学 · 物理学 2017-06-07 Thomas Motz , Joachim Ankerhold , Jürgen T. Stockburger

This survey has been written in occasion of the School and Workshop about Optimal Transport on Quantum Structures at Erd\"os Center in September 2022. We discuss some recent results on noncommutative entropic optimal transport problems and…

数学物理 · 物理学 2023-10-17 Lorenzo Portinale

Entanglement, one of the clearest manifestations of non-classical physics, holds significant promise for technological applications such as more secure communications and faster computations. In this paper we explore the use of…

量子物理 · 物理学 2024-02-14 Karl Pelka , Matteo Aquilina , André Xuereb

We present a general method for calculating coherent electronic transport in quantum wires and tunnel junctions. It is based upon a real space high order finite difference representation of the single particle Hamiltonian and wave…

材料科学 · 物理学 2007-05-23 Petr A. Khomyakov , Geert Brocks

We investigate the dynamics of a strongly correlated quantum dot system in the mixed valence regime based on the hierarchical equations of motion (HEOM) approach. The transient and steady state transport properties after a quantum quench…

强关联电子 · 物理学 2017-09-11 YongXi Cheng , ZhenHua Li , JianHua Wei , YiJing Yan

We introduce the first simple mechanical system that shows fully realistic transport behavior while still being exactly solvable at the level of equilibrium statistical mechanics. The system under consideration is a Lorentz gas with fixed…

统计力学 · 物理学 2009-10-31 C. Mejia-Monasterio , H. Larralde , F. Leyvraz

We discuss control of the quantum-transport properties of a mesoscopic device by connecting it in a coherent feedback loop with a quantum-mechanical controller. We work in a scattering approach and derive results for the combined scattering…

介观与纳米尺度物理 · 物理学 2014-12-24 Clive Emary , John Gough

The entanglement dynamics of an anisotropic two-qubit Heisenberg XYZ system in the presence of intrinsic decoherence is studied. The usefulness of such system for performance of the quantum teleportation protocol ${\cal T}_0$ and…

量子物理 · 物理学 2010-03-16 S. Javad Akhtarshenas , Fardin Kheirandish , Hamidreza Mohammadi

Heisenberg-type spin models in the limit of a low number of excitations are useful tools to study basic mechanisms in strongly correlated and magnetic systems. Many of these mechanisms can be experimentally tested using ultracold atoms.…

量子物理 · 物理学 2013-12-09 Gian Luca Giorgi , Thomas Busch

The many electron correlated scattering (MECS) approach to quantum electronic transport was investigated in the linear response regime [I. Baldea and H. Koeppel, Phys. Rev. B. 78, 115315 (2008)]. The authors suggest, based on numerical…

介观与纳米尺度物理 · 物理学 2015-05-14 J. C. Greer , P. Delaney , G. Fagas