6,223 research outputs found
Catalytic quantum teleportation
Quantum catalysis is an intricate feature of quantum entanglement. It
demonstrates that in certain situations the very presence of entanglement can
improve one's abilities of manipulating other entangled states. At the same
time, however, it is not clear if using entanglement catalytically can provide
additional power for any of the existing quantum protocols. Here we show, for
the first time, that catalysis of entanglement can provide a genuine advantage
in the task of quantum teleportation. More specifically, we show that extending
the standard teleportation protocol by giving Alice and Bob the ability to use
entanglement catalytically, allows them to achieve fidelity of teleportation at
least as large as the regularisation of the standard teleportation quantifier,
the so-called average fidelity of teleportation. Consequently, we show that
this regularised quantifier surpasses the standard benchmark for a variety of
quantum states, therefore demonstrating that there are quantum states whose
ability to teleport can be further improved when assisted with entanglement in
a catalytic way. This hints that entanglement catalysis can be a promising new
avenue for exploring novel advantages in the quantum domain.Comment: 6 + 2 pages, 2 figures. Comments welcome
Determination of Strange Sea Quark Distributions from Fixed-target and Collider Data
We present an improved determination of the strange sea distribution in the
nucleon with constraints coming from the recent charm production data in
neutrino-nucleon deep-inelastic scattering by the NOMAD and CHORUS experiments
and from charged current inclusive deep-inelastic scattering at HERA. We
demonstrate that the results are consistent with the data from the ATLAS and
the CMS experiments on the associated production of -bosons with
-quarks. We also discuss issues related to the recent strange sea
determination by the ATLAS experiment using LHC collider data.Comment: 23 pages, 14 figure
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Multiobject operational tasks for convex quantum resource theories of state-measurement pairs
The prevalent modus operandi within the framework of quantum resource
theories has been to characterise and harness the resources within single
objects, in what we can call \emph{single-object} quantum resource theories.
One can wonder however, whether the resources contained within multiple
different types of objects, now in a \emph{multi-object} quantum resource
theory, can simultaneously be exploited for the benefit of an operational task.
In this work, we introduce examples of such multi-object operational tasks in
the form of subchannel discrimination and subchannel exclusion games, in which
the player harnesses the resources contained within a state-measurement pair.
We prove that for any state-measurement pair in which either of them is
resourceful, there exist discrimination and exclusion games for which such a
pair outperforms any possible free state-measurement pair. These results hold
for arbitrary convex resources of states, and arbitrary convex resources of
measurements for which classical post-processing is a free operation.
Furthermore, we prove that the advantage in these multi-object operational
tasks is determined, in a multiplicative manner, by the resource quantifiers
of: \emph{generalised robustness of resource} of both state and measurement for
discrimination games and \emph{weight of resource} of both state and
measurement for exclusion games.Comment: 5+8 page
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