1,005 research outputs found
Exceeding classical capacity limit in quantum optical channel
The amount of information transmissible through a communications channel is
determined by the noise characteristics of the channel and by the quantities of
available transmission resources. In classical information theory, the amount
of transmissible information can be increased twice at most when the
transmission resource (e.g. the code length, the bandwidth, the signal power)
is doubled for fixed noise characteristics. In quantum information theory,
however, the amount of information transmitted can increase even more than
twice. We present a proof-of-principle demonstration of this super-additivity
of classical capacity of a quantum channel by using the ternary symmetric
states of a single photon, and by event selection from a weak coherent light
source. We also show how the super-additive coding gain, even in a small code
length, can boost the communication performance of conventional coding
technique.Comment: 4 pages, 3 figure
The emergence of expanding space-time in a novel large- limit of the Lorentzian type IIB matrix model
The Lorentzian type IIB matrix model is a promising candidate for a
non-perturbative formulation of superstring theory. However, it was found
recently that a Euclidean space-time appears in the conventional large-
limit. In this work, we add a Lorentz invariant mass term to the original model
and consider a limit, in which the coefficient of the mass term vanishes at
large . By performing complex Langevin simulations to overcome the sign
problem, we observe the emergence of expanding space-time with the Lorentzian
signature.Comment: 10 pages, 8 figures, Contribution to the 39th International Symposium
on Lattice Field theory (LATTICE2022), 8th-13th August, 2022, Bonn, Germany;
(v2) reference adde
Ammonia and lactate blood levels on hospital arrival predict neurological outcome in patients with out-of-hospital cardiac arrest
Correlation between IL-6 and S-100B blood levels and outcome of post-cardiac arrest syndrome and influence of therapeutic hypothermia on these mediator blood levels
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