2 research outputs found
Generalized form of optimal teleportation witnesses
We propose a generalized form of optimal teleportation witness to demonstrate
their importance in experimental detection of the larger set of entangled
states useful for teleportation in higher dimensional systems. The interesting
properties of our witness reveal that teleportation witness can be used to
characterize mixed state entanglement using Schmidt numbers. Our results show
that while every teleportation witness is also a entanglement witness, the
converse is not true. Also, we show that a hermitian operator is a
teleportation witness iff it is a decomposable entanglement witness. In
addition, we analyze the practical significance of our study by decomposing our
teleportation witness in terms of Pauli and Gell-Mann matrices, which are
experimentally measurable quantities.Comment: Accepted in Quantum Information Processin
A cloned qutrit and its utility in information processing tasks
We, in this paper, analyze the efficacy of an output as a resource from a
universal quantum cloning machine in information processing tasks such as
teleportation and dense coding. For this, we have considered the
dimensional system (or qutrit system). The output states are found to be NPT
states for certain ranges of machine parameters. Using the output state as an
entangled resource, we have also studied the optimal fidelities of
teleportation and capacities of dense coding protocols with respect to the
machine parameters and have made a few interesting observations. Our work is
mainly motivated from the fact that the cloning output can be used as a
resource in quantum information processing and adds a valuable dimension to the
applications of cloning machines.Comment: 18 pages, 4 figures, (The arxiv version of this article have been
modified and some typos present in the earlier version have been corrected