7,529 research outputs found
Quantum Private Comparison: A Review
As an important branch of quantum secure multiparty computation, quantum
private comparison (QPC) has attracted more and more attention recently. In
this paper, according to the quantum implementation mechanism that these
protocols used, we divide these protocols into three categories: The quantum
cryptography QPC, the superdense coding QPC, and the entanglement swapping QPC.
And then, a more in-depth analysis on the research progress, design idea, and
substantive characteristics of corresponding QPC categories is carried out,
respectively. Finally, the applications of QPC and quantum secure multi-party
computation issues are discussed and, in addition, three possible research
mainstream directions are pointed out
Matter Power Spectra in Viable Gravity Models with Massive Neutrinos
We investigate the matter power spectra in the power law and exponential
types of viable theories along with massive neutrinos. The enhancement
of the matter power spectrum is found to be a generic feature in these models.
In particular, we show that in the former type, such as the Starobinsky model,
the spectrum is magnified much larger than the latter one, such as the
exponential model. A greater scale of the total neutrino mass, , is allowed in the viable models than that in the CDM
one. We obtain the constraints on the neutrino masses by using the CosmoMC
package with the modified MGCAMB. Explicitly, we get $\Sigma m_{\nu} < 0.451 \
(0.214)\ \mathrm{eV}\Lambda\Sigma m_{\nu} < 0.200\
\mathrm{eV}N_{\mathrm{eff}}\Sigma m_{\nu}N_{\mathrm{eff}} = 3.78^{+0.64}_{-0.84} (3.47^{+0.74}_{-0.60})\Sigma m_{\nu} = 0.533^{+0.254}_{-0.411}< 0.386) \ \mathrm{eV}$ at 95%
C.L. in the Starobinsky (exponential) model.Comment: 15 pages, 5 figures, updated version accepted by PL
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