121 research outputs found
Efficient symmetric multiparty quantum state sharing of an arbitrary m-qubit state
We present a scheme for symmetric multiparty quantum state sharing of an
arbitrary -qubit state with Greenberger-Horne-Zeilinger states following
some ideas from the controlled teleportation [Phys. Rev. A \textbf{72}, 02338
(2005)]. The sender Alice performs Bell-state measurements on her
particles and the controllers need only to take some single-photon product
measurements on their photons independently, not Bell-state measurements, which
makes this scheme more convenient than the latter. Also it does not require the
parties to perform a controlled-NOT gate on the photons for reconstructing the
unknown -qubit state and it is an optimal one as its efficiency for qubits
approaches the maximal value.Comment: 6 pages, no figures; It simplifies the process for sharing an
arbitrary m-qubit state in Phys. Rev. A 72, 022338 (2005) (quant-ph/0501129
Symmetric multiparty-controlled teleportation of an arbitrary two-particle entanglement
We present a way for symmetric multiparty-controlled teleportation of an
arbitrary two-particle entangled state based on Bell-basis measurements by
using two Greenberger-Horne-Zeilinger states, i.e., a sender transmits an
arbitrary two-particle entangled state to a distant receiver, an arbitrary one
of the agents via the control of the others in a network. It will be
shown that the outcomes in the cases that is odd or it is even are
different in principle as the receiver has to perform a controlled-not
operation on his particles for reconstructing the original arbitrary entangled
state in addition to some local unitary operations in the former. Also we
discuss the applications of this controlled teleporation for quantum secret
sharing of classical and quantum information. As all the instances can be used
to carry useful information, its efficiency for qubits approaches the maximal
value.Comment: 9 pages, 3 figures; the revised version published in Physical Review
A 72, 022338 (2005). The detail for setting up a GHZ-state quantum channel is
adde
Three-party qutrit-state sharing
A three-party scheme for securely sharing an arbitrary unknown single-qutrit
state is presented. Using a general Greenberger-Horne-Zeilinger (GHZ) state as
the quantum channel among the three parties, the quantum information (i.e., the
qutrit state) from the sender can be split in such a way that the information
can be recovered if and only if both receivers collaborate. Moreover, the
generation of the scheme to multi-party case is also sketched.Comment: 7 page
Breaking Rate-Distance Limitation of Measurement-Device-Independent Quantum Secret Sharing
Quantum secret sharing is an important cryptographic primitive for network
applications ranging from secure money transfer to multiparty quantum
computation. Currently most progresses on quantum secret sharing suffer from
rate-distance bound, and thus the key rates are limited and unpractical for
large-scale deployment. Furthermore, the performance of most existing protocols
is analyzed in the asymptotic regime without considering participant attacks.
Here we report a measurement-device-independent quantum secret sharing protocol
with improved key rate and transmission distance. Based on spatial
multiplexing, our protocol shows it can break rate-distance bounds over network
under at least ten communication parties. Compared with other protocols, our
work improves the secret key rate by more than two orders of magnitude and has
a longer transmission distance. We analyze the security of our protocol in the
composable framework considering participant attacks. Based on the security
analysis, we also evaluate their performance in the finite-size regime. In
addition, we investigate applying our protocol to digital signatures where the
signature rate is improved more than times compared with existing
protocols. Based on our results, we anticipate that our quantum secret sharing
protocol will provide a solid future for multiparty applications on quantum
network.Comment: arXiv admin note: text overlap with arXiv:2212.0522
Multiparty quantum secret splitting and quantum state sharing
A protocol for multiparty quantum secret splitting is proposed with an
ordered EPR pairs and Bell state measurements. It is secure and has the
high intrinsic efficiency and source capacity as almost all the instances are
useful and each EPR pair carries two bits of message securely. Moreover, we
modify it for multiparty quantum state sharing of an arbitrary -particle
entangled state based on quantum teleportation with only Bell state
measurements and local unitary operations which make this protocol more
convenient in a practical application than others.Comment: 7 pages, 1 figure. The revision of the manuscript appeared in PLA.
Some procedures for detecting cheat have been added. Then the security
loophole in the original manuscript has been eliminate
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