513 research outputs found
Quantum Private Comparison: A Review
As an important branch of quantum secure multiparty computation, quantum
private comparison (QPC) has attracted more and more attention recently. In
this paper, according to the quantum implementation mechanism that these
protocols used, we divide these protocols into three categories: The quantum
cryptography QPC, the superdense coding QPC, and the entanglement swapping QPC.
And then, a more in-depth analysis on the research progress, design idea, and
substantive characteristics of corresponding QPC categories is carried out,
respectively. Finally, the applications of QPC and quantum secure multi-party
computation issues are discussed and, in addition, three possible research
mainstream directions are pointed out
Quantum secure direct communication network with superdense coding and decoy photons
A quantum secure direct communication network scheme is proposed with quantum
superdense coding and decoy photons. The servers on a passive optical network
prepare and measure the quantum signal, i.e., a sequence of the -dimensional
Bell states. After confirming the security of the photons received from the
receiver, the sender codes his secret message on them directly. For preventing
a dishonest server from eavesdropping, some decoy photons prepared by measuring
one photon in the Bell states are used to replace some original photons. One of
the users on the network can communicate any other one. This scheme has the
advantage of high capacity, and it is more convenient than others as only a
sequence of photons is transmitted in quantum line.Comment: 6 pages, 2 figur
Teleportation of a qubit using entangled non-orthogonal states: A comparative study
The effect of non-orthogonality of an entangled non-orthogonal state based
quantum channel is investigated in detail in the context of the teleportation
of a qubit. Specifically, average fidelity, minimum fidelity and minimum
assured fidelity (MASFI) are obtained for teleportation of a single qubit state
using all the Bell type entangled non-orthogonal states known as quasi Bell
states. Using Horodecki criterion, it is shown that the teleportation scheme
obtained by replacing the quantum channel (Bell state) of the usual
teleportation scheme by a quasi Bell state is optimal. Further, the performance
of various quasi Bell states as teleportation channel is compared in an ideal
situation (i.e., in the absence of noise) and under different noise models
(e.g., amplitude and phase damping channels). It is observed that the best
choice of the quasi Bell state depends on the amount non-orthogonality, both in
noisy and noiseless case. A specific quasi Bell state, which was found to be
maximally entangled in the ideal conditions, is shown to be less efficient as a
teleportation channel compared to other quasi Bell states in particular cases
when subjected to noisy channels. It has also been observed that usually the
value of average fidelity falls with an increase in the number of qubits
exposed to noisy channels (viz., Alice's, Bob's and to be teleported qubits),
but the converse may be observed in some particular cases.Comment: 14 pages, 4 figure
Photonic entanglement as a resource in quantum computation and quantum communication
Entanglement is an essential resource in current experimental implementations
for quantum information processing. We review a class of experiments exploiting
photonic entanglement, ranging from one-way quantum computing over quantum
communication complexity to long-distance quantum communication. We then
propose a set of feasible experiments that will underline the advantages of
photonic entanglement for quantum information processing.Comment: 33 pages, 4 figures, OSA styl
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