Zobrazeno 1 - 10
of 69
pro vyhledávání: '"Kim, Ilki"'
Autor:
Kim, Ilki
In this work, we study the fluctuation relation and the second law of thermodynamics within a quantum linear oscillator externally driven over the period of time t = tau. To go beyond the standard approach (the two-point projective measurement one) t
Externí odkaz:
http://arxiv.org/abs/2003.01264
Autor:
Kim, Ilki
In this work, we consider the phase-space picture of quantum mechanics. We then introduce non-negative Wigner-like (operational) distributions \widetilde{\mathcal W}_{rho;alpha}(x,p) corresponding to the density operator \hat{rho} and being proportio
Externí odkaz:
http://arxiv.org/abs/1904.03145
Autor:
Kim, Ilki
Publikováno v:
Phys. Rev. E 97, 062141 (2018)
In this work, we study the Renyi-alpha entropies S_{alpha}(\hat{rho}) = (1 - alpha)^{-1} \ln{Tr(\hat{rho}^{alpha})} of quantum states for N bosons in the phase-space representation. With the help of the Bopp rule, we derive the entropies of Gaussian
Externí odkaz:
http://arxiv.org/abs/1804.05980
We consider two specific thermodynamic cycles of engine operating in a finite time coupled to two thermal reservoirs with a finite heat capacity: The Carnot-type cycle and the Lorenz-type cycle. By means of the endo-reversible thermodynamics, we then
Externí odkaz:
http://arxiv.org/abs/1710.03570
Autor:
Kim, ILki, von Spakovsky, Michael R.
Publikováno v:
Phys. Rev. E 96, 022129 (2017)
Quantum systems driven by time-dependent Hamiltonians are considered here within the framework of steepest-entropy-ascent quantum thermodynamics (SEAQT) and used to study the thermodynamic characteristics of such systems. In doing so, a generalizatio
Externí odkaz:
http://arxiv.org/abs/1703.01336
Autor:
Madakavil, Abhimanyu S, Kim, Ilki
We consider both Otto and Diesel heat engine cycles running upon the working substances modeled by the van der Waals fluid as a simple non-ideal gas model. We extensively perform the efficiency study in these model engines. Then we find that this "re
Externí odkaz:
http://arxiv.org/abs/1609.08974
Autor:
Kim, ILki, Patnaik, Soumya S.
We consider a quantum self-contained fridge consisting of three qubits interacting with three separate heat reservoirs, respectively, and functioning without any external controls. Applying the methods of endoreversible thermodynamics, we derive expl
Externí odkaz:
http://arxiv.org/abs/1510.08947
Autor:
Kim, Ilki
We consider a time-dependent quantum linear oscillator coupled to a bath at an arbitrary strength. We then introduce a generalized Jarzynski equality (GJE) which includes the terms reflecting the system-bath coupling. This enables us to study systema
Externí odkaz:
http://arxiv.org/abs/1402.7056
Autor:
Kim, Ilki
We consider a linear chain of quantum harmonic oscillators, in which the number of the individual oscillators is given by an arbitrary number N, and each oscillator is coupled at an arbitrary strength kappa to its nearest neighbors ("intra-coupling")
Externí odkaz:
http://arxiv.org/abs/1304.1283
Autor:
Kim, Ilki
We consider the time evolution of a particle subjected to both a uniform electrostatic field F and a one-dimensional delta-function potential well. We derive the propagator K_F(x,t|x',0) of this system, directly leading to the wavefunction psi_F(x,t)
Externí odkaz:
http://arxiv.org/abs/1205.2312