6,678 research outputs found
Field test of quantum key distribution in the Tokyo QKD Network
A novel secure communication network with quantum key distribution in a
metropolitan area is reported. Different QKD schemes are integrated to
demonstrate secure TV conferencing over a distance of 45km, stable long-term
operation, and application to secure mobile phones.Comment: 21 pages, 19 figure
Experimental quantum key distribution with finite-key security analysis for noisy channels
In quantum key distribution implementations, each session is typically chosen
long enough so that the secret key rate approaches its asymptotic limit.
However, this choice may be constrained by the physical scenario, as in the
perspective use with satellites, where the passage of one terminal over the
other is restricted to a few minutes. Here we demonstrate experimentally the
extraction of secure keys leveraging an optimal design of the
prepare-and-measure scheme, according to recent finite-key theoretical
tight-bounds. The experiment is performed in different channel conditions, and
assuming two distinct attack models: individual attacks, or general quantum
attacks. The request on the number of exchanged qubits is then obtained as a
function of the key size and of the ambient quantum bit error rate. The results
indicate that viable conditions for effective symmetric, and even one-time-pad,
cryptography are achievable.Comment: 20 pages, 4 figure
A Free Space Optic/Optical Wireless Communication: A Survey
The exponential demand for the next generation of services over free space optic and wireless optic communication is a necessity to approve new guidelines in this range. In this review article, we bring together an earlier study associated with these schemes to help us implement a multiple input/multiple output flexible platform for the next generation in an efficient manner. OWC/FSO is a complement clarification to radiofrequency technologies. Notably, they are providing various gains such as unrestricted authorizing, varied volume, essential safekeeping, and immunity to interference.
- âŠ