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

Optics and Spectroscopy

Effect of thermal environment on quantum nonlocality of superposition of two coherent states (π/2 out of phase)

D. K. Mishra

Published Oct 1, 2014• 2 citations
Publisher

Abstract

Recently we studied the tests of Bell-type inequalities with superposition of two coherent states (π/2 out of phase) [D. K. Mishra, Acta Phys. Pol. A. 123 , 21 (2013)]. Here, we study the effect of thermal environment on the Bell-CHSH inequality. As the state interacts with the thermal environment, the time evolution of the linear entropy to study the purity loss in the state has also been examined.

DOI
10.1134/s0030400x14100178

Related papers

Decoherence of Bell-type Inequality of Superposition of Two Coherent States (π/2 Out of Phase)

Devendra Kumar Mishra

We study the effect of thermal environment on the Bell-CHSH inequality for superposition of two coherent states (π/2 out of phase) and the time evolution of the linear entropy to study the purity loss in the state has also been examined.

International conference on fiber optics and photonics•Jan 1, 2014•0 citations

Violation of Bell--CHSH--CH Inequalities by Superposition of Two Coherent States (π/2 Out of Phase)

Devendra Kumar Mishra

We study the tests of the BellCHSH & CH inequalities by superposition of two coherent states (π/2 out of phase), a class of non-Gaussian state, using photon parity and on/o measurements.Large violations of the Bell--type inequalities have been observed theoretically conrming the interpretation and validity of quantum mechanics against the local-realistic theories.

Acta Physica Polonica A•Jan 1, 2013•3 citations

THE NONLOCALITY OF AN ENTANGLED COHERENT STATE AND ITS EVOLUTION BY USING PSEUDOSPIN OPERATORS

Gong Ren-shan

By using Bell CHSH inequality,nonlocality of a kind of entangled coherent state and its evolution in a vacuum thermal reservoir are studied.It is shown that nonlocality of the state are related with the phases.In this paper we just give the results when φ-2=0 is satisfied,on the other hand nonlocality of the state decreases gradually and disappears finally under the time evolution in a vacuum thermal reservoir.

Journal of Nanchang University•Jan 1, 2005•0 citations

ON THE NONLOCALITY OF TWO KINDS OF ENTANGLED COHERENT STATES

Gong Ren-shan

By using the criterion for violating Bell-CHSH inequality proposed by Horodecki,we have studied the quantum nonlocality of two kinds of entangled coherent states.Some formulas for evaluating the maximal expectation values of Bell-CHSH type operators of these entangled coherent states are derived.It is shown that the quantum nonlocality has relations with the strength and phase of coherent state.When some relations of the strength and phase are satisfied the nonlocality of entangled coherent states may disappear.

Journal of Nanchang University•Jan 1, 2004•0 citations

Nonlocality and purity in atom–field coupling system

Cai Xin, Huang Guang-ming, Gao‐xiang Li

The effects of initial field state and thermal environment on quantum nonlocality and linear entropy in an atom–field coupling system are investigated. We found that if the cavity is lossless and the reservoir is in vacuum, the atom–field state can exhibit quantum nonlocality periodically and the linear entropies of the atom and the field also oscillate periodically with a period the same as that of quantum nonlocality. And if the cavity dissipation is very weak and the average photon number of the reservoir is very small, the quantum nonlocality will be lost and the linear entropies of the atom and the field oscillate with a decreasing amplitude. The rapidity of the loss of the quantum nonlocality depends on the amplitude of the initial squeezed coherent state, the cavity damping constant κ and the average photon number N of the thermal reservoir. The stronger the field and the larger the constant κ and the average photon number N could be, the more rapidly the nonlocality decreases.

Chinese Physics•Jan 27, 2005•5 citations

Non-locality of Entangled Coherent States and Its Evolution in a Thermal Reservoir

GONGRen-Shan

Regarding the necessary and sufficient condition violating Bell-CHSH's inequality as criterion for nonlocality of entangled states, we present a perturbative calculation determining non-locality of evolving entangled states.Furthermore, by means of the perturbative calculation, the non-locality and its evolution of two kinds of entangled coherent states in a thermal reservoir are discussed.

理论物理通讯:英文版•Jan 1, 2005•0 citations
Recently we studied the tests of Bell-type inequalities with superposition of two coherent states (π/2 out of phase) [D. K. Mishra, Acta Phys. Pol. A. 123 , 21 (2013)]. Here, we study the effect of thermal environment on the Bell-CHSH inequality. As the state interacts with the thermal environment, the time evolution of the linear entropy to study the purity loss in the state has also been examined.
By using the criterion for violating Bell-CHSH inequality proposed by Horodecki,we have studied the quantum nonlocality of two kinds of entangled coherent states.Some formulas for evaluating the maximal expectation values of Bell-CHSH type operators of these entangled coherent states are derived.It is shown that the quantum nonlocality has relations with the strength and phase of coherent state.When some relations of the strength and phase are satisfied the nonlocality of entangled coherent states may disappear.
The effects of initial field state and thermal environment on quantum nonlocality and linear entropy in an atom–field coupling system are investigated. We found that if the cavity is lossless and the reservoir is in vacuum, the atom–field state can exhibit quantum nonlocality periodically and the linear entropies of the atom and the field also oscillate periodically with a period the same as that of quantum nonlocality. And if the cavity dissipation is very weak and the average photon number of the reservoir is very small, the quantum nonlocality will be lost and the linear entropies of the atom and the field oscillate with a decreasing amplitude. The rapidity of the loss of the quantum nonlocality depends on the amplitude of the initial squeezed coherent state, the cavity damping constant κ and the average photon number N of the thermal reservoir. The stronger the field and the larger the constant κ and the average photon number N could be, the more rapidly the nonlocality decreases.