72 research outputs found
Laser Field Induced Birefringence and Enhancement of Magneto-optical Rotation
An initially isotropic medium, when subjected to either a magnetic field or a
coherent field, can induce anisotropy in the medium and can cause the
polarization of a probe field to rotate. Therefore the rotation of probe
polarization, due to magnetic field alone, can be controlled efficiently with
the use of a coherent control field. We demonstrate this enhancement of the
magneto-optical rotation (MOR) of a linearly polarized light, by doing detailed
calculations on a system with relevant transitions .Comment: 9 pages including 4 Figure
Spontaneously generated atomic entanglement in free space: reinforced by incoherent pumping
We study spontaneously generated entanglement (SGE) between two identical
multilevel atoms in free space via vacuum-induced radiative coupling. We show
that the SGE in two-atom systems may initially increase with time but
eventually vanishes in the time scale determined by the excited state lifetime
and radiative coupling strength between the two atoms. We demonstrate that a
steady-state SGE can be established by incoherently pumping the excited states
of the two-atom system. We have shown that an appropriate rate of incoherent
pump can help producing optimal SGE. The multilevel systems offer us more
chanel to establish entanglement. The system under consideration could be
realized in a tight trap or atoms/ions doped in a solid substrate.Comment: have some difference with published version (please see PRA
AdvGen: Physical Adversarial Attack on Face Presentation Attack Detection Systems
Evaluating the risk level of adversarial images is essential for safely
deploying face authentication models in the real world. Popular approaches for
physical-world attacks, such as print or replay attacks, suffer from some
limitations, like including physical and geometrical artifacts. Recently,
adversarial attacks have gained attraction, which try to digitally deceive the
learning strategy of a recognition system using slight modifications to the
captured image. While most previous research assumes that the adversarial image
could be digitally fed into the authentication systems, this is not always the
case for systems deployed in the real world. This paper demonstrates the
vulnerability of face authentication systems to adversarial images in physical
world scenarios. We propose AdvGen, an automated Generative Adversarial
Network, to simulate print and replay attacks and generate adversarial images
that can fool state-of-the-art PADs in a physical domain attack setting. Using
this attack strategy, the attack success rate goes up to 82.01%. We test AdvGen
extensively on four datasets and ten state-of-the-art PADs. We also demonstrate
the effectiveness of our attack by conducting experiments in a realistic,
physical environment.Comment: 10 pages, 9 figures, Accepted to the International Joint Conference
on Biometrics (IJCB 2023
Anomalous Raman scattering from phonons and electrons of superconducting FeSe
We report interesting anomalies in the temperature dependent Raman spectra of
FeSe measured from 3K to 300K in the spectral range from 60 to 1800
cm and determine their origin using complementary first-principles
density functional calculations. A phonon mode near 100 cm exhibits a
sharp increase by 5% in frequency below a temperature T ( 100
K) attributed to strong spin-phonon coupling and onset of short-range
antiferromagnetic order. In addition, two high frequency modes are observed at
1350 cm and 1600 cm, attributed to electronic Raman scattering
from ()to / -orbitals of Fe.Comment: 19 pages, 4 figures, 1 tabl
Synthesis and SAR in 1-substituted-4-[4-fluorobenzoyl/6,7-dimethoxy-3,4- dihydroisoquinolyl]piperidines and related compounds
56-6
Quantum correlations between a pair of Raman photons from a single atom under arbitrary excitation condition
The quantum correlation between a pair of Stokes and anti-Stokes photons, involving a Raman emission process is calculated. All realistic radiative and nonradiative decays are included in the calculation and the photon correlation between the pair for arbitrarily strong excitation fields and detunings are calculated. The correlation function shows photon antibunching, and a damped sinusoidal behavior with respect to the time delay between the measurement of the two photons. The current system can also produce four photon entanglement
Measurement of ground-state decoherence via interruption of coherent population trapping
Journals published by the American Physical Society can be found at http://publish.aps.org/We examine the role of ground-state coherence on the fluorescence from the excited state in a three-level Lambda system under continuous-wave excitation. When resonantly pumped, the fluorescence is strongly affected by any perturbation in the ground-state coherent population trapping. From our analytical results, we suggest how to use this strong dependence of fluorescence on the ground-state decays as a new method for the measurement of the ground-state decoherence rates. Our calculations should work well for a wide range of systems such as atomic vapors with a buffer gas, active dopants in solids, and quantum dots, etc. We present a proof of principle experiment using Rb-87 vapor
Coherent Control of Magneto-optical Rotation in Inhomogeneously Broadened Medium
We extend our earlier investigations [Opt. Commun. {\bf 179}, 97 (2000)] on
the enhancement of magneto-optical rotation (MOR) to include inhomogeneous
broadening. We introduce a control field that counter-propagates with respect
to the probe field. We derive analytical results for the susceptibilities
corresponding to the two circular polarization components of the probe field.
From the analytical results we identify and numerically demonstrate the
region of parameters where significantly large magneto-optical rotation (MOR)
can be obtained. From the numerical results we isolate the significance of the
magnetic field and the control field in enhancement of MOR. The control field
opens up many new regions of the frequencies of the probe where large
magneto-optical rotation occurs. We also report that a large enhancement of MOR
can be obtained by operating the probe and control field in two-photon
resonance condition.Comment: REVTex format, 14 pages including 6 figures, to be published in
Optics Communication
Effects of collisions on electronic-resonance-enhanced coherent anti-Stokes Raman scattering of nitric oxide
Cavity-induced coherence effects in spontaneous emission from pre-Selection of polarization
Spontaneous emission can create coherences in a multilevel atom having close
lying levels, subject to the condition that the atomic dipole matrix elements
are non-orthogonal. This condition is rarely met in atomic systems. We report
the possibility of bypassing this condition and thereby creating coherences by
letting the atom with orthogonal dipoles to interact with the vacuum of a
pre-selected polarized cavity mode rather than the free space vacuum. We derive
a master equation for the reduced density operator of a model four level atomic
system, and obtain its analytical solution to describe the interference
effects. We report the quantum beat structure in the populations.Comment: 6 pages in REVTEX multicolumn format, 5 figures, new references
added, journal reference adde
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