Effects of Zeeman degeneracy on the steady-state properties of an atom interacting with a near-resonant laser field: Probe spectra

1994 ◽  
Vol 49 (5) ◽  
pp. 3391-3395 ◽  
Author(s):  
Bo Gao
Keyword(s):  
Steady State ◽  
Laser Field ◽  
Resonant Laser

Steady-state correlations of two atoms interacting with a reservoir

2012 ◽  
Vol 12 (3&4) ◽  
pp. 231-252
Author(s):  
Luis Octavio Castanos
Keyword(s):  
Electromagnetic Field ◽  
Steady State ◽  
Master Equation ◽  
Field Intensity ◽  
Mixed State ◽  
Laser Field ◽  
Quantum Discord ◽  
Energy Levels ◽  
High Laser ◽  
X State

We consider two two-level atoms fixed at different positions, driven by a resonant monochromatic laser field, and interacting collectively with the quantum electromagnetic field. A Born-Markov-secular master equation is used to describe the dynamics of the two atoms and the steady-state is obtained analytically for a configuration of the atoms. The steady-state populations of the energy levels of the free atoms, entanglement, quantum and geometric discords and degree of mixedness are calculated analytically as a function of the laser field intensity and the distance between the two atoms. It is found that there is a possibility of considerable steady-state entanglement and left/right quantum discord and that these can be controlled either by increasing/decreasing the intensity of the laser field or by increasing/decreasing the distance between atoms. It is shown that the system of two atoms can be prepared in a separable mixed state with non-zero quantum discord that turns into an $X$-state for high laser field intensities. The behavior and relationships between the different correlations are studied and several limiting cases are investigated.

Cooling and trapping of atoms and molecules by a resonant laser field

1976 ◽  
Vol 19 (1) ◽  
pp. 72-75 ◽  
Author(s):  
V.S. Letokhov ◽  
V.G. Minogin ◽  
B.D. Pavlik
Keyword(s):  
Laser Field ◽  
Atoms And Molecules ◽  
Resonant Laser

scholarly journals Optical control of the spin of a magnetic atom in a semiconductor quantum dot

Nanophotonics ◽  
2015 ◽  
Vol 4 (1) ◽  
pp. 75-89 ◽  
Author(s):  
L. Besombes ◽  
H. Boukari ◽  
C. Le Gall ◽  
A. Brunetti ◽  
C.L. Cao ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Fine Structure ◽  
Solid State ◽  
Laser Field ◽  
Coherent Control ◽  
Spin Dynamics ◽  
Optical Control ◽  
Zero Magnetic Field ◽  
Magnetic Atom ◽  
Resonant Laser

Abstract:The control of single spins in solids is a key but challenging step for any spin-based solid-state quantumcomputing device. Thanks to their expected long coherence time, localized spins on magnetic atoms in a semiconductor host could be an interesting media to store quantum information in the solid state. Optical probing and control of the spin of individual or pairs of Manganese (Mn) atoms (S = 5/2) have been obtained in II-VI and IIIV semiconductor quantum dots during the last years. In this paper, we review recently developed optical control experiments of the spin of an individual Mn atoms in II-VI semiconductor self-assembled or strain-free quantum dots (QDs).We first show that the fine structure of the Mn atom and especially a strained induced magnetic anisotropy is the main parameter controlling the spin memory of the magnetic atom at zero magnetic field. We then demonstrate that the energy of any spin state of a Mn atom or pairs of Mn atom can be independently tuned by using the optical Stark effect induced by a resonant laser field. The strong coupling with the resonant laser field modifies the Mn fine structure and consequently its dynamics.We then describe the spin dynamics of a Mn atom under this strong resonant optical excitation. In addition to standard optical pumping expected for a resonant excitation, we show that the Mn spin population can be trapped in the state which is resonantly excited. This effect is modeled considering the coherent spin dynamics of the coupled electronic and nuclear spin of the Mn atom optically dressed by a resonant laser field. Finally, we discuss the spin dynamics of a Mn atom in strain-free QDs and show that these structures should permit a fast optical coherent control of an individual Mn spin.

Excitation of atomic hydrogen due to proton impact in the presence of a resonant laser field

1995 ◽  
Vol 52 (4) ◽  
pp. 372-376 ◽  
Author(s):  
Vinod Prasad ◽  
Bhupat Sharma ◽  
Man Mohan
Keyword(s):  
Atomic Hydrogen ◽  
Laser Field ◽  
Proton Impact ◽  
Resonant Laser

scholarly journals TRANSIENT AND STEADY-STATE ABSORPTIONS OF A WEAK PROBE FIELD IN A COUPLED DOUBLE QUANTUM-WELL STRUCTURE

2009 ◽  
Vol 23 (18) ◽  
pp. 2215-2227 ◽  
Author(s):  
WEN-XING YANG ◽  
JIN XU ◽  
RAY-KUANG LEE
Keyword(s):  
Steady State ◽  
Quantum Well ◽  
Laser Field ◽  
Probe Laser ◽  
Double Quantum ◽  
Probe Field ◽  
Two Photon ◽  
State Process ◽  
Double Quantum Well ◽  
Efficient Scheme

We propose and analyze an efficient scheme for suppressing the absorption of a weak probe field based on intersubband transitions in a four-level asymmetric coupled quantum well (CQW) driven coherently by a probe laser field and a control laser field. We study the steady-state process analytically and numerically, and our results show that the probe absorption can be completely eliminated under the condition of Raman resonance (i.e. two-photon detuning is zero). Besides, we can observe one transparency window without requiring one- or two-photon detuning to exactly vanish. This investigation may provide a possible scheme for EIT in solids by using the CQW.

EFFECT OF PHASE FLUCTUATIONS OF LASER ON OPTICAL FORCES IN A TWO-LEVEL ATOM

2000 ◽  
Vol 14 (17n18) ◽  
pp. 631-637 ◽  
Author(s):  
S. V. LAWANDE ◽  
P. V. PANAT
Keyword(s):  
Angular Momentum ◽  
Steady State ◽  
Master Equation ◽  
Gaussian Beam ◽  
Laser Field ◽  
Density Operator ◽  
Bessel Beam ◽  
Optical Forces ◽  
Phase Fluctuations ◽  
Level Atom

An effect of phase fluctuations of a driving laser field on dissipative and dipolar forces of two-level atom is considered. The phase fluctuations are treated by a phase diffusion model where phase fluctuations follow Wiener–Levy process. An exact master equation for the relevant density operator is obtained and solved in the steady state. Optical forces are calculated. The effect of phase fluctuations on angular momentum imparted by a Laguerre–Gaussian beam and an ideal Bessel beam to the atom is investigated.

Sign in / Sign up

Export Citation Format

Share Document