169,534 research outputs found
Quantum secure direct communication based on supervised teleportation
We present a quantum secure direct communication(QSDC) scheme as an extension
for a proposed supervised secure entanglement sharing protocol. Starting with a
quick review on the supervised entanglement sharing protocol -- the "Wuhan"
protocol [Y. Li and Y. Liu, arXiv:0709.1449v2], we primarily focus on its
further extend using for a QSDC task, in which the communication attendant
Alice encodes the secret message directly onto a sequence of 2-level particles
which then can be faithfully teleported to Bob using the shared maximal
entanglement states obtained by the previous "Wuhan" protocol. We also evaluate
the security of the QSDC scheme, where an individual self-attack performed by
Alice and Bob -- the out of control attack(OCA) is introduced and the
robustness of our scheme on the OCA is documented.Comment: 5 pages, 1 table, oral contribution in the Conference on Quantum
Optics and Applications in Computing and Communications, Photonics Asia 2007,
Proc. of SPI
Low-Cost High-Sensitivity Strain and Temperature Sensing Using Graded-Index Multimode Fibers
We report a low-loss, low-cost high-sensitivity all-fiber strain and temperature sensor based on mode interference in graded-index multimode fibers. Blueshifts with strain and temperature sensitivities of 18.6 pm/microstrain and 58.5 pm/°C have been observed. Experimental results show that smaller core diameter graded-index fibers display greater strain-induced peak wavelength shifts than larger core diameter fibers
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