3,771 research outputs found
A sufficient Entanglement Criterion Based On Quantum Fisher Information and Variance
We derive criterion in the form of inequality based on quantum Fisher
information and quantum variance to detect multipartite entanglement. It can be
regarded as complementary of the well-established PPT criterion in the sense
that it can also detect bound entangled states. The inequality is motivated by
Y.Akbari-Kourbolagh [Phys. Rev A. 99, 012304 (2019)] which introduced
a multipartite entanglement criterion based on quantum Fisher information. Our
criterion is experimentally measurable for detecting any -qudit pure state
mixed with white noisy. We take several examples to illustrate that our
criterion has good performance for detecting certain entangled states.Comment: 11 pages, 1 figur
Complete Study of Hadroproduction of a Meson Associated with a Prompt
We present the first complete study of and prompt
production from single-parton scattering, including the complete
color-singlet contribution, the
electroweak contribution, the complete
nonrelativistic S-wave and P-wave color-octet contribution as well as the
feeddown contribution. Our study was motivated by the recent evidence reported
by D0 Collaboration of prompt and simultaneous production
at the Tevatron. With our complete evaluation, we are able to refine the
determination of the double parton scattering contribution made by D0
Collaboration. We find that the effective cross section characterizing the
importance of double-parton scatterings is mb at
confidence level from the D0 measurement.Comment: 11 pages, 4 figures, 4 tables; v2: journal version, update the
references and fix a few typo
Characterization of four-qubit states via Bell inequalities
A set of Bell inequalities classifying the quantum entanglement of four-qubit
states is presented. These inequalities involve only two measurement settings
per observer and can characterize fully separable, bi-separable and
tri-separable quantum states. In addition, a quadratic inequality of the Bell
operators for four-qubit systems is derived
Feynman Rules for the Rational Part of One-loop QCD Corrections in the MSSM
The complete set of Feynman rules for the rational part R of QCD corrections
in the MSSM are calculated at the one-loop level, which can be very useful in
the next-to-leading order calculations in supersymmetric models. Our results
are expressed in the 't Hooft-Veltman regularization scheme and in the Four
Dimensional Helicity scheme with non-anticommutating and anticommutating
strategies.Comment: version for publication, 50 pages, 6 figure
Entropic uncertainty relations with quantum memory in a multipartite scenario
Entropic uncertainty relations demonstrate the intrinsic uncertainty of
nature from an information-theory perspective. Recently, a
quantum-memory-assisted entropic uncertainty relation for multiple measurements
was proposed by Wu [Phys Rev A. 106. 062219 (2022)]. Interestingly,
the quantum-memory-assisted entropic uncertainty relation for multiple
measurement settings can be further generalized. In this work, we propose two
complementary multipartite quantum-memory-assisted entropic uncertainty
relations and our lower bounds depend on values of complementarity of the
observables, (conditional) von-Neumann entropies, Holevo quantities, and mutual
information. As an illustration, we provide several typical cases to exhibit
that our bounds are tighter and outperform the previous bounds.Comment: 7 pages, 3 figure
- …