Browsing by Subject "quantph"
Now showing items 114 of 14

A Quantum Kinetic Monte Carlo Method for Quantum Manybody Spin Dynamics
(20171130)We propose a general framework of quantum kinetic Monte Carlo algorithm, based on a stochastic representation of a series expansion of the quantum evolution. Two approaches have been developed in the context of quantum manybody ... 
Bogoliubov corrections and trace norm convergence for the Hartree dynamics
We consider the dynamics of a large number N of nonrelativistic bosons in the mean field limit for a class of interaction potentials that includes Coulomb interaction. In order to describe the fluctuations around the mean ... 
Coherence distillation machines are impossible in quantum thermodynamics
(Nature Communications, 202012)The role of coherence in quantum thermodynamics has been extensively studied in the recent years and it is now wellunderstood that coherence between different energy eigenstates is a resource independent of other ... 
DrivenDissipative Phase Transition in a Kerr Oscillator: From SemiClassical PT Symmetry to Quantum Fluctuations.
(Physical Review A, 20210324)We study a minimal model that has a drivendissipative quantum phase transition, namely a Kerr nonlinear oscillator subject to driving and dissipation. Using meanfield theory, exact diagonalization, and the Keldysh formalism, ... 
Effective dynamics of a tracer particle in a dense homogeneous quantum gas
We investigate the mean field regime of the dynamics of a tracer particle in a homogenous quantum gas. For a bosonic gas, we show that this regime is constrained by the well known requirement of an appropriate mean field ... 
Effective Dynamics of a Tracer Particle Interacting with an Ideal Bose Gas
(Communications in Mathematical Physics, 201406)We study a system consisting of a heavy quantum particle, called the tracer particle, coupled to an ideal gas of light Bose particles, the ratio of masses of the tracer particle and a gas particle being proportional to the ... 
Free Time Evolution of a Tracer Particle Coupled to a Fermi Gas in the HighDensity Limit
(Communications in Mathematical Physics, 201711)© 2017, SpringerVerlag GmbH Germany. The dynamics of a particle coupled to a dense and homogeneous ideal Fermi gas in two spatial dimensions is studied. We analyze the model for coupling parameter g = 1 (i.e., not in the ... 
Interference of chiral Andreev edge states
(Nature Physics, 20200801)© 2020, The Author(s), under exclusive licence to Springer Nature Limited. The search for topological excitations such as Majorana fermions has spurred interest in the boundaries between distinct quantum states. Here, we ... 
Lindblad equation and its semiclassical limit of the AndersonHolstein model
(20170423)For multilevel open quantum system, the interaction between different levels could pose challenge to understand the quantum system both analytically and numerically. In this work, we study the approximation of the dynamics ... 
Onedimensional waveguide coupled to multiple qubits: Photonphoton correlations
(EPJ Quantum Technology, 20141201)For a onedimensional (1D) waveguide coupled to two or three qubits, we show that the photonphoton correlations have a wide variety of behavior, with structure that depends sensitively on the frequency and on the qubitqubit ... 
Random logic networks: From classical Boolean to quantum dynamics
We investigate dynamical properties of a quantum generalization of classical reversible Boolean networks. The state of each node is encoded as a single qubit, and classical Boolean logic operations are supplemented ... 
Spontaneous Pair Creation Revisited
Recently the so called Spontaneous Pair Creation of electron positron pairs in a strong external field has been rigorously established. We give here the heuristic core of the proof, since the results differ from those given ... 
Unveiling environmental entanglement in strongly dissipative qubits
(arXiv, 20130130)The coupling of a qubit to a macroscopic reservoir plays a fundamental role in understanding the complex transition from the quantum to the classical world. Considering a harmonic environment, we use both intuitive arguments ... 
Wavepackets in inhomogeneous periodic media: effective particlefield dynamics and Berry curvature
(20170423)We consider a model of an electron in a crystal moving under the influence of an external electric field: Schr\"{o}dinger's equation with a potential which is the sum of a periodic function and a general smooth function. ...