134 research outputs found
Effective squeezing enhancement via measurement-induced non-Gaussian operation and its application to dense coding scheme
We study the measurement-induced non-Gaussian operation on the single- and
two-mode \textit{Gaussian} squeezed vacuum states with beam splitters and
on-off type photon detectors, with which \textit{mixed non-Gaussian} states are
generally obtained in the conditional process. It is known that the
entanglement can be enhanced via this non-Gaussian operation on the two-mode
squeezed vacuum state. We show that, in the range of practical squeezing
parameters, the conditional outputs are still close to Gaussian states, but
their second order variances of quantum fluctuations and correlations are
effectively suppressed and enhanced, respectively. To investigate an
operational meaning of these states, especially entangled states, we also
evaluate the quantum dense coding scheme from the viewpoint of the mutual
information, and we show that non-Gaussian entangled state can be advantageous
compared with the original two-mode squeezed state.Comment: REVTeX4, 14 pages with 21 figure
A Study on Theory of Body in Maurice Merleau-Ponty’s Phenomenology ― From the viewpoint of ‘Waza’ in Japanese High School Baseball ―
[EN] This study aims to expand the theory of body in Maurice Merleau‐Ponty’s phenomenology from the viewpoint..
A Study on Theory of Body in Maurice Merleau-Ponty’s Phenomenology ― From the viewpoint of ‘Waza’ in Japanese High School Baseball ―
Investigation of the Superconducting Gap Structure in SrFe(AsP) by Magnetic Penetration Depth and Flux Flow Resistivity Analysis
We measured the microwave surface impedances and obtained the superfluid
density and flux flow resistivity in single crystals of a phosphor-doped
iron-based superconductor SrFe(AsP) single crystals
(, ). At low temperatures, the superfluid density,
, obeys a power law, , with a
fractional exponent of -1.6. The flux flow resistivity was significantly
enhanced at low magnetic fields. These features are consistent with the
presences of both a gap with line nodes and nodeless gaps with a deep minimum.
The remarkable difference observed in the superconducting gap structure between
SrFe(AsP) and BaFe(AsP) in our
experiments is important for clarifying the mechanism of iron-based
superconductivity
Two-color photoassociation spectroscopy of ytterbium atoms and the precise determinations of s-wave scattering lengths
By performing high-resolution two-color photoassociation spectroscopy, we
have successfully determined the binding energies of several of the last bound
states of the homonuclear dimers of six different isotopes of ytterbium. These
spectroscopic data are in excellent agreement with theoretical calculations
based on a simple model potential, which very precisely predicts the s-wave
scattering lengths of all 28 pairs of the seven stable isotopes. The s-wave
scattering lengths for collision of two atoms of the same isotopic species are
13.33(18) nm for ^{168}Yb, 3.38(11) nm for ^{170}Yb, -0.15(19) nm for ^{171}Yb,
-31.7(3.4) nm for ^{172}Yb, 10.55(11) nm for ^{173}Yb, 5.55(8) nm for ^{174}Yb,
and -1.28(23) nm for ^{176}Yb. The coefficient of the lead term of the
long-range van der Waals potential of the Yb_2 molecule is C_6=1932(30) atomic
units J nm^6).Comment: 9 pages, 7 figure
Theoretical analysis of headache recurrence in patients administered triptans for migraine based on receptor occupancy
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