Quantum coherence for an atom interacting with an electromagnetic field in the background of cosmic string spacetime

2020 ◽  
Vol 19 (10) ◽  
Author(s):  
Zhiming Huang
Keyword(s):  
Electromagnetic Field ◽  
Cosmic String ◽  
Quantum Coherence

ATOMIC VELOCITY SELECTION BY INTERFERENCE IN TWO-PHOTON IONIZATION

1996 ◽  
Vol 05 (04) ◽  
pp. 911-919
Author(s):  
J.C. GARREAU ◽  
D. WILKOWSKI ◽  
D. HENNEQUIN ◽  
V. ZEHNLÉ
Keyword(s):  
Electromagnetic Field ◽  
Quantum Interference ◽  
Quantum Coherence ◽  
Degrees Of Freedom ◽  
Internal State ◽  
Center Of Mass ◽  
Mass Motion ◽  
Two Photon ◽  
Selective Ionization ◽  
Velocity Selection

This paper discusses a new scheme for generating quantum coherence between different degrees of freedom of an atom interacting with two modes of the electromagnetic field. The presence of quantum interference in a two-photon coupling between the ground state of the atom and the continuum through two quasi-resonant intermediate states induces selective ionization of the atoms for particular combinations of the different parameters characterizing the degrees of freedom of the system, leading to quantum coherence between the internal state, the center-of-mass motion of the atom, and the electromagnetic field. The application of this method to the selection of an atomic velocity class is discussed.

scholarly journals Protecting quantum coherence of two-level atoms from vacuum fluctuations of electromagnetic field

2016 ◽  
Vol 366 ◽  
pp. 102-112 ◽  
Author(s):  
Xiaobao Liu ◽  
Zehua Tian ◽  
Jieci Wang ◽  
Jiliang Jing
Keyword(s):  
Electromagnetic Field ◽  
Quantum Coherence ◽  
Vacuum Fluctuations

Scattering states of Dirac equation in the presence of cosmic string for Coulomb interaction

2015 ◽  
Vol 30 (21) ◽  
pp. 1550124 ◽  
Author(s):  
M. Hosseinpour ◽  
H. Hassanabadi
Keyword(s):  
Electromagnetic Field ◽  
Dirac Equation ◽  
Coulomb Interaction ◽  
Coulomb Potential ◽  
Cosmic String ◽  
Phase Shifts ◽  
Space Time ◽  
Radial Part ◽  
Scattering States ◽  
Scalar Potentials

We study the covariant Dirac equation in the space–time generated by a cosmic string in presence of vector and scalar potentials of electromagnetic field. We obtain the solution of the radial part of Dirac equation. We consider the scattering states under the Coulomb potential and obtain the phase shifts.

Decohering power of thermal fluctuating electromagnetic field with a boundary

2019 ◽  
Vol 34 (26) ◽  
pp. 1950177
Author(s):  
Zhiming Huang ◽  
Wei Zhang ◽  
Shenggen Zheng ◽  
Tianqing Wang ◽  
Yungang Bian ◽  
...  
Keyword(s):  
Electromagnetic Field ◽  
Master Equation ◽  
Quantum Coherence ◽  
Boundary Effect ◽  
Plane Boundary ◽  
Thermal Bath ◽  
Atomic Position ◽  
Vacuum Fluctuation ◽  
System Evolution ◽  
Field Temperature

In this paper, we analyze the decohering power behaviors for an atom immersed in a thermal bath of fluctuating electromagnetic field in the presence of a perfectly reflecting plane boundary. Firstly, we analytically solve the master equation that governs the system evolution. Then, we discuss the behaviors of decohering power for an atom affected by thermal fluctuating electromagnetic field. It is found that the behaviors of decohering power are dependent on the field temperature, atomic position and polarization. Decohering power fluctuates to relatively stable values with the increasing atom’s distance from the boundary, which suggests a possible way of detecting the vacuum fluctuating and boundary effect. Additional conditions on the electromagnetic field give one more freedom to manipulate the variations of decohering power. Decohering power variations can efficiently reflect the behaviors of quantum coherence affected by electromagnetic vacuum fluctuation, and it is shown that quantum coherence can be effectively enhanced with the presence of a reflecting boundary.

scholarly journals SPIN-WEIGHTED GREEN’S FUNCTIONS IN A CONICAL SPACE

1996 ◽  
Vol 11 (39n40) ◽  
pp. 3075-3079
Author(s):  
B. LINET
Keyword(s):  
Electromagnetic Field ◽  
Scalar Field ◽  
Cosmic String ◽  
Green's Functions ◽  
Green’S Functions ◽  
Zero Temperature ◽  
Massless Spin ◽  
Rindler Space

We give an analysis of the spin-weighted Green’s functions in a conical space. We apply these results in the case of a straight cosmic string and in the Rindler space in order to determine generally the Euclidean Green’s functions for the massless spin-1/2 field and for the electromagnetic field. We give also the corresponding Green’s functions at zero temperature. However, except for the scalar field, it seems that these Euclidean Green’s functions do not correspond to the thermal Feynman Green’s functions.

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