The Density Matrix and the Relaxation of Two-Level Systems

2018 ◽  
pp. 147-191
Keyword(s):  
Density Matrix ◽  
Two Level Systems

Density matrix and purity evolution in dissipative two-level systems: II. Relaxation

2021 ◽  
Author(s):  
Sambarta Chatterjee ◽  
Nancy Makri
Keyword(s):  
Density Matrix ◽  
Time Evolution ◽  
Reduced Density Matrix ◽  
Level System ◽  
Two Level Systems ◽  
Reduced Density ◽  
Harmonic Bath

We investigate the time evolution of the reduced density matrix (RDM) and its purity in the dynamics of a two-level system coupled to a dissipative harmonic bath, when the system is initially placed in one of its eigenstates.

Density matrix and purity evolution in dissipative two-level systems: I. Theory and path integral results for tunneling dynamics

2021 ◽  
Vol 23 (9) ◽  
pp. 5113-5124
Author(s):  
Sambarta Chatterjee ◽  
Nancy Makri
Keyword(s):  
Density Matrix ◽  
Path Integral ◽  
Von Neumann Entropy ◽  
Level System ◽  
Von Neumann ◽  
Bacteriochlorophyll Dimer ◽  
Two Level Systems ◽  
Tunneling Dynamics ◽  
Reduced Density ◽  
Harmonic Bath

The time evolution of the purity (the trace of the square of the reduced density matrix) and von Neumann entropy in a symmetric two-level system coupled to a dissipative harmonic bath is investigated through analytical arguments and accurate path integral calculations on simple models and the singly excited bacteriochlorophyll dimer.

scholarly journals Quantum Thermal Rectification to Design Thermal Diodes and Transistors

2017 ◽  
Vol 72 (2) ◽  
pp. 163-170 ◽  
Author(s):  
Karl Joulain ◽  
Younès Ezzahri ◽  
Jose Ordonez-Miranda
Keyword(s):  
Density Matrix ◽  
Master Equation ◽  
Markov Approximation ◽  
Thermal Rectification ◽  
Thermal Reservoir ◽  
Two Level Systems

AbstractWe study in this article how heat can be exchanged between two-level systems, each of them being coupled to a thermal reservoir. Calculations are performed solving a master equation for the density matrix using the Born–Markov approximation. We analyse the conditions for which a thermal diode and a thermal transistor can be obtained as well as their optimisation.

The density matrix of a dissipative system

1985 ◽  
Vol 46 (1) ◽  
pp. 1-4 ◽  
Author(s):  
R. Omnès
Keyword(s):  
Density Matrix ◽  
Dissipative System

DIELECTRIC EVIDENCE FOR EXISTENCE OF TWO-LEVEL-SYSTEMS IN CYCLOHEXANOL, A " GLASSY CRYSTAL " SYSTEM

1982 ◽  
Vol 43 (C9) ◽  
pp. C9-525-C9-527
Author(s):  
G. P. Singh ◽  
R. Vacher ◽  
R. Calemczuk
Keyword(s):  
Crystal System ◽  
Two Level Systems

Density matrix and rate equation analyses for picosecond pump/probe combustion diagnostics

AIAA Journal ◽  
1999 ◽  
Vol 37 ◽  
pp. 723-731
Author(s):  
Thomas Settersten ◽  
Mark Linne ◽  
James Gord ◽  
Gregory Feichtner
Keyword(s):  
Density Matrix ◽  
Rate Equation ◽  
Pump Probe ◽  
Combustion Diagnostics

Estimate of the conversion time in macroscopic two-level systems

1983 ◽  
Vol 56 (3) ◽  
pp. 897-903 ◽  
Author(s):  
E. K. Bashkirov ◽  
N. N. Bogolyubov ◽  
A. S. Shumovskii
Keyword(s):  
Two Level Systems ◽  
Conversion Time

scholarly journals Effect of Nuclear Quadrupole Interactions on the Dynamics of Two-Level Systems in Glasses

2006 ◽  
Vol 96 (2) ◽  
Author(s):  
A. L. Burin ◽  
I. Ya. Polishchuk ◽  
P. Fulde ◽  
Y. Sereda
Keyword(s):  
Quadrupole Interactions ◽  
Nuclear Quadrupole Interactions ◽  
Two Level Systems ◽  
Nuclear Quadrupole
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