1,057 research outputs found
Maximal violation of Clauser-Horne-Shimony-Holt inequality for two qutrits
Bell-Clauser-Horne-Shimony-Holt inequality (in terms of correlation
functions) of two qutrits is studied in detail by employing tritter
measurements. A uniform formula for the maximum value of this inequality for
tritter measurements is obtained. Based on this formula, we show that
non-maximally entangled states violate the Bell-CHSH inequality more strongly
than the maximally entangled one. This result is consistent with what was
obtained by Ac{\'{i}}n {\it et al} [Phys. Rev. A {\bf 65}, 052325 (2002)] using
the Bell-Clauser-Horne inequality (in terms of probabilities).Comment: 6 pages, 3 figure
Entangling two giant atoms via a topological waveguide
We study the entanglement generation of two two-level giant atoms coupled to
a photonic waveguide, which is formed by a Su-Schrieffer-Heeger (SSH) type
coupled-cavity array. Here, each atom is coupled to the waveguide through two
coupling points. We focus on the two-atom separate-coupling case, and consider
sixteen coupling configurations for the coupling-point distributions between
the two atoms and the waveguide. We derive quantum master equations to govern
the evolution of the two atoms and characterize atomic entanglement by
calculating the concurrence of the two-atom states. It is found that the two
giant-atom entanglement depends on the coupling configurations and the
coupling-point distance of the giant atoms. In particular, the entanglement
dynamics of the two giant atoms in fourteen coupling configurations depends on
the dimerization parameter of the SSH waveguide. According to the self-energies
of the two giant atoms, we find that ten of these sixteen coupling
configurations can be divided into five pairs. We also show that delayed sudden
birth of entanglement between the two giant atoms is largely enhanced in these
five pairs of coupling configurations. This work will promote the study of
quantum effects and coherent manipulation in giant-atom
topological-waveguide-QED systems.Comment: 21 pages, 5 figures, submitted to New J. Phys. on Sep. 1st, 202
Triggers of Permo-Triassic boundary mass extinction in South China: the Siberian Traps or Paleo-Tethys ignimbrite flare-up?
Shadow Thermodynamics of AdS Black Hole with the Nonlinear Electrodynamics Term
In this paper, we have creatively employed the shadow radius to study the
thermodynamics of a charged AdS black hole with a nonlinear
electrodynamics(NLED) term. First, the connection between the shadow radius and
event horizon is constructed with the aid of the geodesic analysis. It turns
out that the black hole shadow radius shows a positive correlation as a
function of the event horizon radius. Then in the shadow context, we found that
the black hole temperature and heat capacity can be presented by the shadow
radius. And further analysis shows that the shadow radius can do as well as the
event horizon in revealing black hole phase transition process. In this sense,
we constructed the thermal profile of the charged AdS black hole with inclusion
of the NLED effect. In P < Pc case, it is found that the N-type trend of the
temperature given by the shadow radius is always coincide with that obtained by
using the event horizon. So, we can concluded for the charged AdS black hole
that the phase transition process can be intuitively presented as the thermal
profile in the shadow context. Finally, the effects of NLED have been carefully
analysed through out the paper.Comment: 17 pages, 21 figure
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