18,912 research outputs found
Quantum Digital Signature based on Quantum One-way Functions
A quantum digital signature protocol based on quantum mechanics is proposed
in this paper. The security of the protocol relies on the existence of quantum
one-way functions by quantum information theorem. This protocol involves a
so-called arbitrator who validates and authenticates the signed message. In
this protocol, we use privacy key algorithm to ensure the security of quantum
information on channel and use quantum public keys to sign message. To
guarantee the authenticity of the message, a family of quantum stabilizer codes
are employed. Our protocol presents a novel method to construct ultimately
secure digital system in future secure communication.Comment: 9 pages, 1 tabl
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Converting a CAD Model into a Manufacturing Model for the Components Made of a Multiphase Perfect Material
To manufacture the component made of a multiphase perfect material (including homogeneous
and multi heterogeneous materials), it CAD model should be processed and converted into
layered manufacturing model for further transformation of numerical control (NC) coding. This
paper develops its detailed approaches and corresponding software. The process planning is made
first and includes: (1) determining the build orientation of the component; and (2) slicing the
component into layers adaptively according to different material regions since different materials
have different optimal layer thickness for manufacturing. After the process planning, the layered
manufacturing models with necessary information, including fabrication sequence and material
information of each layer, are fully generated.Mechanical Engineerin
Gluon saturation and pseudo-rapidity distributions of charged hadrons at RHIC energy regions
We modified the gluon saturation model by rescaling the momentum fraction
according to saturation momentum and introduced the Cooper-Frye hydrodynamic
evolution to systematically study the pseudo-rapidity distributions of final
charged hadrons at different energies and different centralities for Au-Au
collisions in relativistic heavy-ion collisions at BNL Relativistic Heavy Ion
Collider (RHIC). The features of both gluon saturation and hydrodynamic
evolution at different energies and different centralities for Au-Au collisions
are investigated in this paper.Comment: 14 pages, 4 figure
A Unitary Model of The Black Hole Evaporation
A unitary effective field model of the black hole evaporation is proposed to
satisfy almost the four postulates of the black hole complementarity (BHC). In
this model, we enlarge a black hole-scalar field system by adding an extra
radiation detector that couples with the scalar field. After performing a
partial trace over the scalar field space, we obtain an effective entanglement
between the black hole and the detector (or radiation in it). As the whole
system evolves, the S-matrix formula can be constructed formally step by step.
Without local quantum measurements, the paradoxes of the information loss and
AMPS's firewall can be resolved. However, the information can be lost due to
quantum decoherence, as long as some local measurement has been performed on
the detector to acquire the information of the radiation in it. But unlike
Hawking's completely thermal spectrum, some residual correlations can be found
in the radiations. All these considerations can be simplified in a qubit model
that provides a \emph{modified quantum teleportation} to transfer the
information via an EPR pairs.Comment: 42 pages,two figures,published versio
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