6,573 research outputs found
Chosen-Plaintext Cryptanalysis of a Clipped-Neural-Network-Based Chaotic Cipher
In ISNN'04, a novel symmetric cipher was proposed, by combining a chaotic
signal and a clipped neural network (CNN) for encryption. The present paper
analyzes the security of this chaotic cipher against chosen-plaintext attacks,
and points out that this cipher can be broken by a chosen-plaintext attack.
Experimental analyses are given to support the feasibility of the proposed
attack.Comment: LNCS style, 7 pages, 1 figure (6 sub-figures
Geometric phases in dressed state quantum computation
Geometric phases arise naturally in a variety of quantum systems with
observable consequences. They also arise in quantum computations when dressed
states are used in gating operations. Here we show how they arise in these
gating operations and how one may take advantage of the dressed states
producing them. Specifically, we show that that for a given, but arbitrary
Hamiltonian, and at an arbitrary time {\tau}, there always exists a set of
dressed states such that a given gate operation can be performed by the
Hamiltonian up to a phase {\phi}. The phase is a sum of a dynamical phase and a
geometric phase. We illustrate the new phase for several systems.Comment: 4 pages, 2 figure
Crystal structure and SUMO binding of Slx1-Slx4 complex
published_or_final_versio
Casimir Invariants for Systems Undergoing Collective Motion
Dicke states are states of a collection of particles which have been under
active investigation for several reasons. One reason is that the decay rates of
these states can be quite different from a set of independently evolving
particles. Another reason is that a particular class of these states are
decoherence-free or noiseless with respect to a set of errors. These noiseless
states, or more generally subsystems, can avoid certain types of errors in
quantum information processing devices. Here we provide a method for
calculating invariants of systems of particles undergoing collective motions.
These invariants can be used to determine a complete set of commuting
observables for a class of Dicke states as well as identify possible logical
operations for decoherence-free/noiseless subsystems. Our method is quite
general and provides results for cases where the constituent particles have
more than two internal states.Comment: 5 page
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