42,653 research outputs found
Security of Plug-and-Play QKD Arrangements with Finite Resources
The security of a passive plug-and-play QKD arrangement in the case of finite
(resources) key lengths is analysed. It is assumed that the eavesdropper has
full access to the channel so an unknown and untrusted source is assumed. To
take into account the security of the BB84 protocol under collective attacks
within the framework of quantum adversaries, a full treatment provides the
well-known equations for the secure key rate. A numerical simulation keeping a
minimum number of initial parameters constant as the total error sought and the
number of pulses is carried out. The remaining parameters are optimized to
produce the maximum secure key rate. Two main strategies are addressed: with
and without two-decoy-states including the optimization of signal to decoy
relationship
Quantum Myers effect and its supergravity dual for D0/D4 systems
The presence of a distant D4-brane is used to further investigate the duality
between M-theory and D0-brane quantum mechanics. A polarization of the quantum
mechanical ground state is found. A similar deformation arises for the bubble
of normal space found near D0-branes in classical supergravity solutions. These
deformations are compared and are shown to have the same structure in each
case.Comment: 7 pages, based on a talk presented at the conference MRST 2001 at
London, Canad
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