6,590 research outputs found
Interaction of crippling and torsional-flexural instabilities for centrally loaded columns
Empirical technique predicts failure loads for centrally loaded columns with thin-walled, open cross sections. Interaction of two failure modes is predicted by modification of the Johnson-Euler equation
|0>|1>+|1>|0>
I give a simple argument that demonstrates that the state |0>|1>+|1>|0>, with
|0> denoting a state with 0 particles and |1> a 1-particle state, is entangled
in spite of recent claims to the contrary. I also discuss new viewpoints on the
old controversy about whether the above state can be said to display
single-particle or single-photon nonlocality.Comment: A more serious version, almost 2.36 pages, but still an unnormalized
titl
Readout scheme of the fullerene-based quantum computer by a single electron transistor
The readout of the quantum spin state is a challenge for any spin-based
quantum computing implementation. We propose a scheme, based on the achieved
technique of single electron transistor (SET), to implement the readout of
electronic spin state inside a doped fullerene by means of the
magnetic dipole-dipole coupling and spin filters. In the presence of an
external magnetic field, we show how to perform the spin state detection by
transforming the information contained in the spin state into the tunneling
current. The robustness of our scheme against sources of error is discussed.Comment: RevTex, 1 table and two figures. Latest versio
Strong photon non-linearities and photonic Mott insulators
We show, that photon non-linearities in electromagnetically induced
transparency can be at least one order of magnitude larger than predicted in
all previous approaches. As an application we demonstrate that, in this regime
they give rise to very strong photon - photon interactions which are strong
enough to make an experimental realization of a photonic Mott insulator state
feasible in arrays of coupled ultra high-Q micro-cavities.Comment: minor changes, to appear in Phys. Rev. Let
Coherent spectroscopy of rare-earth-ion doped whispering-gallery mode resonators
We perform an investigation into the properties of Pr3+:Y2SiO5 whispering
gallery mode resonators as a first step towards achieving the strong coupling
regime of cavity QED with rare-earth-ion doped crystals. Direct measurement of
cavity QED parameters are made using photon echoes, giving good agreement with
theoretical predictions. By comparing the ions at the surface of the resonator
to those in the center it is determined that the physical process of making the
resonator does not negatively affect the properties of the ions. Coupling
between the ions and resonator is analyzed through the observation of optical
bistability and normal-mode splitting.Comment: 8 pages, 9 figure
Absolute frequency measurements of the line and fine-structure interval in K
We report a value for the -line frequency of K with 0.25 ppb
uncertainty. The frequency is measured using an evacuated ring-cavity resonator
whose length is calibrated against a reference laser. The line presents a
problem in identifying the line center because the closely-spaced energy levels
of the excited state are not resolved. We use computer modelling of the
measured spectrum to extract the line center and obtain a value of 391 015
578.040(75) MHz. In conjunction with our previous measurement of the
line, we determine the fine-structure interval in the state to be 1 729
997.132(90) MHz. The results represent significant improvement over previous
values.Comment: 4 pages, 3 figure
Generating EPR beams in a cavity optomechanical system
We propose a scheme to produce continuous variable entanglement between
phase-quadrature amplitudes of two light modes in an optomechanical system. For
proper driving power and detuning, the entanglement is insensitive with bath
temperature and of mechanical oscillator. Under realistic experimental
conditions, we find that the entanglement could be very large even at room
temperature.Comment: 4.1 pages, 4 figures, comments are welcome; to appear in PRA,
published version with corrections of typo
Slosh test analysis for the 200-inch multicell tank
Slosh test analysis of multicell fuel tank
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