14,844 research outputs found
Rabi Oscillations in Systems with Small Anharmonicity
When a two-level quantum system is irradiated with a microwave signal, in
resonance with the energy difference between the levels, it starts Rabi
oscillation between those states. If there are other states close, in energy,
to the first two, the Rabi signal will also induce transition to those. Here,
we study the probability of transition to the third state, in a three-level
system, while a Rabi oscillation between the first two states is performed. We
investigate the effect of pulse shaping on the probability and suggest methods
for optimizing pulse shapes to reduce transition probability.Comment: 7 pages, 7 figure
Putusan Mahkamah Konstitusi, antara Keadilan dan Kepastian Hukum
Some issues are existed regarding to Constitutional Court\u27s performance.First, when a statute examined by the Constitutional Court is stated as havingcontradiction with The Constitution, the legal basis is being questioned. Second,in deciding local public election dispute, the candidate who failed in runningfor the first position, commonly preferred to challenge the election result toConstitutional Court. But, when the decision extremely referred to non-normativeprovision, the jurisdiction of Constitutional Court is being asked. The jurisdictioncame from the authority on laws could being alleged to the misuse of laws. TheUltra Petita decision on many cases noted as the application of the authoritiesowned by the Constitutional Court
Generalized London free energy for high- vortex lattices
We generalize the London free energy to include four-fold anisotropies which
could arise from d-wave pairing or other sources in a tetragonal material. We
use this simple model to study vortex lattice structure and discuss neutron
scattering, STM, Bitter decoration and SR experiments.Comment: REVTeX, 4 pages, 2 .ps figures included, submitted to PR
Mesoscopic multiterminal Josephson structures: I. Effects of nonlocal weak coupling
We investigate nonlocal coherent transport in ballistic four-terminal
Josephson structures (where bulk superconductors (terminals) are connected
through a clean normal layer, e.g., a two-dimensional electron gas).
Coherent anisotropic superposition of macroscopic wave functions of the
superconductors in the normal region produces phase slip lines (2D analogs to
phase slip centres) and time-reversal symmetry breaking 2D vortex states in it,
as well as such effects as phase dragging and magnetic flux transfer. The
tunneling density of local Andreev states in the normal layer was shown to
contain peaks at the positions controlled by the phase differences between the
terminals.
We have obtained general dependence of these effects on the controlling
supercurrent/phase differences between the terminals of the ballistic
mesoscopic four-terminal SQUID.Comment: 18 pages, 11 figure
Macroscopic Resonant Tunneling in the Presence of Low Frequency Noise
We develop a theory of macroscopic resonant tunneling of flux in a
double-well potential in the presence of realistic flux noise with significant
low-frequency component. The rate of incoherent flux tunneling between the
wells exhibits resonant peaks, the shape and position of which reflect
qualitative features of the noise, and can thus serve as a diagnostic tool for
studying the low-frequency flux noise in SQUID qubits. We show, in particular,
that the noise-induced renormalization of the first resonant peak provides
direct information on the temperature of the noise source and the strength of
its quantum component.Comment: 4 pages, 1 figur
Persistent currents in mesoscopic rings and boundary conformal field theory
A tight-binding model of electron dynamics in mesoscopic normal rings is
studied using boundary conformal field theory. The partition function is
calculated in the low energy limit and the persistent current generated as a
function of an external magnetic flux threading the ring is found. We study the
cases where there are defects and electron-electron interactions separately.
The same temperature scaling for the persistent current is found in each case,
and the functional form can be fitted, with a high degree of accuracy, to
experimental data.Comment: 6 pages, 4 enclosed postscript figure
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