3,452 research outputs found
General formulas for capacity of classical-quantum channels
The capacity of a classical-quantum channel (or in other words the classical
capacity of a quantum channel) is considered in the most general setting, where
no structural assumptions such as the stationary memoryless property are made
on a channel. A capacity formula as well as a characterization of the strong
converse property is given just in parallel with the corresponding classical
results of Verd\'{u}-Han which are based on the so-called information-spectrum
method. The general results are applied to the stationary memoryless case with
or without cost constraint on inputs, whereby a deep relation between the
channel coding theory and the hypothesis testing for two quantum states is
elucidated. no structural assumptions such as the stationary memoryless
property are made on a channel. A capacity formula as well as a
characterization of the strong converse property is given just in parallel with
the corresponding classical results of Verdu-Han which are based on the
so-called information-spectrum method. The general results are applied to the
stationary memoryless case with or without cost constraint on inputs, whereby a
deep relation between the channel coding theory and the hypothesis testing for
two quantum states is elucidated
An Approach for Management of Regional Portal Sites through Project-Based Learning
In this paper, we present an approach for management of regional portal sites through project-based learning. In this approach, we have developed a framework to regularly provide information systems and contents based on needs of regional communities for the regional portal site by developing them on the project-based learning in our university. The waterfall model that is one of the software development techniques as the method of executing the project-based learning is practiced. This paper shows current status and effectiveness of our approach
Invariant Regularization of Supersymmetric Chiral Gauge Theory
We formulate a manifestly supersymmetric gauge covariant regularization of
supersymmetric chiral gauge theories. In our scheme, the effective action in
the superfield background field method above one-loop is always supersymmetric
and gauge invariant. The gauge anomaly has a covariant form and can emerge only
in one-loop diagrams with all the external lines being the background gauge
superfield. We also present several illustrative applications in the one-loop
approximation: the self-energy part of the chiral multiplet and of the gauge
multiplet; the super-chiral anomaly and the superconformal anomaly; as the
corresponding anomalous commutators, the Konishi anomaly and an anomalous
supersymmetric transformation law of the supercurrent (the ``central
extension'' of N=1 supersymmetry algebra) and of the R-current.Comment: 43 pages, PHYZZX. Final version to appear in Prog. Theor. Phy
The current and the charge noise of a single-electron transistor in the regime of large charge fluctuations out of equilibrium
By using the Schwinger-Keldysh approach, we evaluate the current noise and
the charge noise of the single-electron transistor (SET) in the regime of large
charge fluctuations caused by large tunneling conductance. Our result
interpolates between previous theories; the "orthodox" theory and the
"co-tunneling theory". We find that the life-time broadening effect suppresses
the Fano factor below the value estimated by the previous theories. We also
show that the large tunnel conductance does not reduce the energy sensitivity
so much. Our results demonstrate quantitatively that SET electrometer can be
used as the high-sensitivity and high-speed device for quantum measurements.Comment: 6 pages, 3 figures, Proccedings of International Symposium on
Mesoscopic Superconductivity and Spintronics (MS+S2002
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