Challenges
Datasets
Workspaces
Papers
Discussions
Leaderboard
Log inSign up
Challenges
Datasets
Workspaces
Papers
Discussions
Leaderboard
Blog
Job Board
Q3AS

© 2026 Aqora Quantum S.A.S.

TermsPrivacyLegal Notice

Journal of Modern Optics

The Evolution of Correlations in a Dissipative System

ARTUR K. EKERT, Simon J. D. Phoenix

Published Jan 1, 1991• 2 citations
Publisher

Abstract

We examine the decay of two correlated atoms to a reservoir prepared in its ground state and in a squeezed multimode vacuum state. We calculate the entropies for the atoms and use the index of correlation to show the decay and regeneration of correlations between the atoms as they interact with the reservoir.
DOI
10.1080/09500349114550051

Related papers

Creation of quantum correlations from an initially vacuum state between two atoms in a dissipative environment

Ferdi Altintas, Resul Eryiğit

•Oct 15, 2011•0 citations

Interaction of Two-Level Atom with Squeezed Vacuum Reservoir

Tamirat Abebe, Demissie Jobir Gelmecha, Chimdessa Gashu Feyisa +1 more

In this paper, the quantum properties of a two-level atom interaction with squeezed vacuum reservoir is throughly analyzed. With the aid of the interaction Hamiltonian and the master equation, we obtain the time evolution of the expectation values of the atomic operators. Employing the steady-state solution of these equations, we calculate the power spectrum and the second-order correlation function for the interaction of two-level atom with squeezed vacuum reservoir. It is found that the half width of the power spectrum of the light increases with the squeeze parameter, r . Furthermore, in the absence of decay constant and interaction time, it enhances the probability for the atom to be in the upper level.

Advances in Mathematical Physics•Jan 29, 2021•4 citations

Establishment of correlated pure states through decay in a squeezed reservoir

ARTUR K. EKERT, G. Massimo Palma, Stephen Mark Barnett +1 more

Our normal understanding of the dissipative relaxation of a quantum system interacting with a reservoir or heat bath leads us to expect that the final state of the quantum system is a mixed state characteristic of one subsystem in equilibrium with the larger reservoir. We show that the broadband squeezed vacuum has such strong correlations in its quantum noise that, although it represents a true reservoir, the decay of subsystems, such as pairs of atoms or oscillators interacting with a squeezed reservoir, relaxes to a pure state that reflects these strong correlations.

Physical Review A•Jun 1, 1989•33 citations

Creation of quantum correlations between two atoms in a dissipative environment from an initial vacuum state

Ferdi Altintas, Resul Eryiğit

arXiv:1110.3418•Physics Letters A•Apr 1, 2012•25 citations

Time evolution of entanglement and quantum correlations in dissipative quantum systems

Gian Luca Giorgi, Fernando Galve, Roberta Zambrini

The time evolution of a pair of coupled, non-identical harmonic oscillators in contact with a common environment is discussed. The characterizations of the quantumness of the system is given by studying the dynamics of entanglement and of other indicators, like quantum discord.

International Conference on Quantum Information•Jan 1, 2011•0 citations

Controlling entanglement dynamics of two qubits coupled to a common reservoir via a coherent field

S. R. J. PATRICK, Fuli Li, Meng Wang +1 more

We investigate the time evolution of entanglement between two two-level atoms which are coupled to a common multimode electromagnetic reservoir and simultaneously driven by a coherent field. We find that the entanglement can always be created and maintained with a moderate intensity of the driving field during the track of approaching steady entangled states when both atoms are initially in their ground states and the reservoir is in the vacuum state or the squeezed vacuum state. We also show that the steady-state entanglement between the atoms can be enhanced by use of the coherent field when the reservoir is in the weakly squeezed vacuum state. More interestingly, in the squeezed reservoir case, the sudden death period in the time evolution of the entanglement can be removed by use of the coherent driving field.

Journal of Modern Optics•Jan 22, 2010•2 citations
In this paper, the quantum properties of a two-level atom interaction with squeezed vacuum reservoir is throughly analyzed. With the aid of the interaction Hamiltonian and the master equation, we obtain the time evolution of the expectation values of the atomic operators. Employing the steady-state solution of these equations, we calculate the power spectrum and the second-order correlation function for the interaction of two-level atom with squeezed vacuum reservoir. It is found that the half width of the power spectrum of the light increases with the squeeze parameter, r . Furthermore, in the absence of decay constant and interaction time, it enhances the probability for the atom to be in the upper level.
Our normal understanding of the dissipative relaxation of a quantum system interacting with a reservoir or heat bath leads us to expect that the final state of the quantum system is a mixed state characteristic of one subsystem in equilibrium with the larger reservoir. We show that the broadband squeezed vacuum has such strong correlations in its quantum noise that, although it represents a true reservoir, the decay of subsystems, such as pairs of atoms or oscillators interacting with a squeezed reservoir, relaxes to a pure state that reflects these strong correlations.
We investigate the time evolution of entanglement between two two-level atoms which are coupled to a common multimode electromagnetic reservoir and simultaneously driven by a coherent field. We find that the entanglement can always be created and maintained with a moderate intensity of the driving field during the track of approaching steady entangled states when both atoms are initially in their ground states and the reservoir is in the vacuum state or the squeezed vacuum state. We also show that the steady-state entanglement between the atoms can be enhanced by use of the coherent field when the reservoir is in the weakly squeezed vacuum state. More interestingly, in the squeezed reservoir case, the sudden death period in the time evolution of the entanglement can be removed by use of the coherent driving field.