20,597 research outputs found
Improving the capacity of the ping-pong protocol
We present a quantum communication protocol which keeps all the properties of
the ping-pong protocol [Phys. Rev. Lett. 89, 187902 (2002)] but improves the
capacity doubly as the ping-pong protocol. Alice and Bob can use the variable
measurement basises in control mode to detect Eve's eavesdropping attack. In
message mode, Alice can use one unitary operations to encode two bits
information. Bob only needs to perform a Bell type measurement to decode
Alice's information. A classical message authentification method can protect
this protocol against the eavesdropping hiding in the quantum channel losses
and the denial-of-service (DoS) attack.Comment: 3page; PACS:03.67.Hk, 03.65.U
Analysis of skin influence in identification of heroin using singular value decomposition
AbstractIn this paper, the influence of skin in energy-dispersive X-ray diffraction (EDXRD) spectrum of heroin was studied using singular value decomposition (SVD). The spectra of pure heroin, skin and heroin covered by skin were organized as matrices for SVD after truncation and smoothing. It was demonstrated that the two largest singular values and their corresponding left and right singular vectors of each matrix could reconstruct the matrix in the permissible error and contained enough information of the matrix. We extracted the two largest singular values of each matrix as two dimensions of the feature point of the corresponding spectrum. The feature points of different samples were clustered and a linear relationship was proved to be between and movement of feature point and thickness of component of skin, such as fat and muscle. This indicated that the method of SVD may be suitable for identification of heroin covered by skin
NLO QCD + NLO EW corrections to productions with leptonic decays at the LHC
Precision tests of the Standard Model (SM) require not only accurate
experiments, but also precise and reliable theoretical predictions. Triple
vector boson production provides a unique opportunity to investigate the
quartic gauge couplings and check the validity of the gauge principle in the
SM. Since the tree-level predictions alone are inadequate to meet this demand,
the next-to-leading order (NLO) calculation becomes compulsory. In this paper,
we calculate the NLO QCD + NLO electroweak (EW) corrections to the
productions with subsequent leptonic decays at the LHC by
adopting an improved narrow width approximation which takes into account the
off-shell contributions and spin correlations from the - and -boson
leptonic decays. The NLO QCD+EW corrected integrated cross sections for the
productions and some kinematic distributions of final products are
provided. The results show that both the NLO QCD and NLO EW corrections are
significant. In the jet-veto event selection scheme with , the NLO QCD+EW relative corrections to the integrated cross section
are and , while the genuine NLO EW relative corrections are
and , for the and productions, respectively.
We also investigate the theoretical dependence of the integrated cross section
on the factorization/renormalization scale, and find that the scale uncertainty
is underestimated at the LO due to the fact that the strong coupling
is not involved in the LO matrix elements.Comment: 19 pages, 8 figure
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