Copying machines

A Graphic Representation of States for Quantum Copying Machines

Abstract: The aim of this paper is to introduce a new graphic representation of quantum states by means of a specific application: the analysis of two models of quantum copying machines. The graphic representation by diagrams of states offers a clear and detailed visualization of quantum information’s flow during the unitary evolution of not too complex systems. The diagrams of states are expon...

Compiler-Guaranteed Safety in Code-Copying Virtual Machines

Virtual Machine authors face a difficult choice between low performance, cheap interpreters, or specialized and costly compilers. A method able to bridge this wide gap is the existing code-copying technique that reuses chunks of the VM’s binary code to create a simple JIT. This technique is not reliable without a compiler guaranteeing that copied chunks are still functionally equivalent despite...

First Passage Time in Computation by Tape-Copying Turing Machines: Slippage of Nascent Tape

Transcription of the genetic message encoded chemically in the sequence of the DNA template is carried out by a molecular machine called RNA polymerase (RNAP). Backward or forward slippage of the nascent RNA with respect to the DNA template strand give rise to a transcript that is, respectively, longer or shorter than the corresponding template. We model a RNAP as a “Tapecopying Turing machine”...

Beyond Copying

Smart copying

Can imitation be considered one of the most successful strategies in business? My answer is " yes ". It appears that this topic is getting more and more attention nowadays. It is well known that Apple's success can be attributed to taking existing ideas and repackaging them with excellent design. However, no one can readily blame Steven Jobs for lacking originality. Even if the ideas for his co...