Symmetry, coherent states, and control of quantum dynamics

2019 ◽  
Author(s):  
Alexander V. Gorokhov
Keyword(s):  
Coherent States ◽  
Quantum Dynamics ◽  
And Control

scholarly journals Memory Effects in Quantum Dynamics Modelled by Quantum Renewal Processes

Entropy ◽  
2021 ◽  
Vol 23 (7) ◽  
pp. 905
Author(s):  
Nina Megier ◽  
Manuel Ponzi ◽  
Andrea Smirne ◽  
Bassano Vacchini
Keyword(s):  
Quantum Dynamics ◽  
Open Quantum System ◽  
Open Quantum Systems ◽  
Phenomenological Approach ◽  
Quantum Systems ◽  
Renewal Processes ◽  
Continuous Part ◽  
Trace Distance ◽  
Open Quantum ◽  
And Control

Simple, controllable models play an important role in learning how to manipulate and control quantum resources. We focus here on quantum non-Markovianity and model the evolution of open quantum systems by quantum renewal processes. This class of quantum dynamics provides us with a phenomenological approach to characterise dynamics with a variety of non-Markovian behaviours, here described in terms of the trace distance between two reduced states. By adopting a trajectory picture for the open quantum system evolution, we analyse how non-Markovianity is influenced by the constituents defining the quantum renewal process, namely the time-continuous part of the dynamics, the type of jumps and the waiting time distributions. We focus not only on the mere value of the non-Markovianity measure, but also on how different features of the trace distance evolution are altered, including times and number of revivals.

On rotational coherent states in molecular quantum dynamics

1999 ◽  
Vol 40 (2) ◽  
pp. 766-786 ◽  
Author(s):  
Jorge A. Morales ◽  
Erik Deumens ◽  
Yngve Öhrn
Keyword(s):  
Coherent States ◽  
Quantum Dynamics

scholarly journals COHERENT STATES OF QUANTUM NONLINEAR SYSTEMS

1995 ◽  
Vol 09 (28n29) ◽  
pp. 1839-1844 ◽  
Author(s):  
Z. HABA
Keyword(s):  
Nonlinear Systems ◽  
Wave Packet ◽  
Integrable Systems ◽  
Coherent States ◽  
Quantum Dynamics ◽  
Wave Packets

Quantum dynamics of integrable systems is discussed. Localized wave packets generalizing the conventional coherent states of minimal uncertainty are constructed. The wave packet moves along a certain trajectory and does not change its shape for times of order [Formula: see text].

scholarly journals QUANTUM DYNAMICS OF THE CUBIT SYSTEM IN EXTERNAL FIELDS

2021 ◽  
Vol 26 (4) ◽  
pp. 68-75
Author(s):  
A. V. Gorokhov ◽  
G. I. Eremenko
Keyword(s):  
Symmetry Group ◽  
Time Evolution ◽  
Coherent States ◽  
Quantum Dynamics ◽  
Dynamic Symmetry ◽  
Classical Dynamics ◽  
External Fields

A system of two dipole-dipole interacting two-level elements (qubits) in external fields is considered. It is shown that using the coherent states (CS) of the dynamic symmetry group of the SU(2)SU(2) system, the time evolution can be reduced to the "classical" dynamics of the complex parameters of the CS. The trajectories of the CS are constructed and the time dependences of the probability of finding qubits at the upper levels are calculated.

scholarly journals Quantum dynamics in phase space: from coherent states to the Gaussian representation

2007 ◽  
Vol 54 (16-17) ◽  
pp. 2499-2512 ◽  
Author(s):  
P. D. Drummond ◽  
P. Deuar ◽  
T. G. Vaughan ◽  
J. F. Corney
Keyword(s):  
Phase Space ◽  
Coherent States ◽  
Quantum Dynamics ◽  
Gaussian Representation

Ultrafast dynamics of single molecules

2014 ◽  
Vol 43 (8) ◽  
pp. 2476-2491 ◽  
Author(s):  
Daan Brinks ◽  
Richard Hildner ◽  
Erik M. H. P. van Dijk ◽  
Fernando D. Stefani ◽  
Jana B. Nieder ◽  
...  
Keyword(s):  
Quantum Dynamics ◽  
Room Temperature ◽  
Organic Dyes ◽  
Single Molecules ◽  
Ultrafast Dynamics ◽  
Ambient Conditions ◽  
Vibrational Dynamics ◽  
Detailed Observation ◽  
Photosynthetic Complexes ◽  
And Control

Room-temperature studies of single molecules at femtosecond timescales provide detailed observation and control of ultrafast electronic and vibrational dynamics of organic dyes and photosynthetic complexes, probing quantum dynamics at ambient conditions and elucidating its role in chemistry and biology.

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