80 research outputs found
Adaptive quantum teleportation
We consider multiple teleportation in the Knill-Laflamme-Milburn (KLM)
scheme. We introduce adaptive teleportation, i.e., such that the choice of
entangled state used in the next teleportation depends on the results of the
measurements performed during the previous teleportations. We show that
adaptive teleportation enables an increase in the probability of faithful
multiple teleportation in the KLM scheme. In particular if a qubit is to be
teleported more than once then it is better to use nonmaximally entangled
states than maximally entangled ones in order to achieve the highest
probability of faithful teleportation.Comment: 4 pages, 1 figur
Multiparty d-dimensional quantum information splitting
Generalization of quantum information splitting protocol from qubits to
qudits (quantum d-dimensional systems) is presented.Comment: 7 page
Two-way teleportation
A protocol for teleporting two qudits simultaneously in opposite directions
using a single pair of maximally entangled qudits is presented. This procedure
works provided that the product of dimensions of the two qudits to be
teleported does not exceed the dimension of the individual qudits in the
maximally entangled pair
Comment on "Information flow of quantum states interacting with closed timelike curves"
We show that recent results on the interaction of causality-respecting
particles with particles on closed timelike curves derived in [Phys. Rev. A 82,
062330 (2010)] depend on ambiguous assumption about the form of the state which
is inputted into the proposed equivalent circuit. Choosing different form of
this state leads to opposite conclusion on the power of closed timelike curves
Galilean invariance without superluminal particles
Recently Dragan and Ekert [New. J. Phys 22, 033038, 2020] presented arguments
that probabilistic dynamics inherent in the realm of quantum physics is related
to the propagation of superluminal particles. Moreover they argue that
existence of such particles is a natural consequence of the principle of
relativity. We show that the proposed extension of Lorentz transformation can
be interpreted in natural way without invoking superluminal phenomena.Comment: 4 page
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