6,273 research outputs found
Entanglement generation in spatially separated systems using quantum walk
We present a novel scheme to generate entanglement between two spatially
separated systems. The scheme makes use of spatial entanglement generated by a
single-particle quantum walk which is used to entangle two spatially separated,
not necessarily correlated, systems. This scheme can be used to entangle any
two systems which can interact with the spatial modes entangled during the
quantum walk evolution. A notable feature is that we can control the quantum
walk dynamics and its ability to localize leads to a substantial control and
improvement in the entanglement output.Comment: 9 pages, 5 figure
Formation of double ring patterns on Co2MnSi Heusler alloy thin film by anodic oxidation under scanning probe microscope
Double ring formation on Co2MnSi (CMS) films is observed at electrical
breakdown voltage during local anodic oxidation (LAO) using atomic force
microscope (AFM). Corona effect and segregation of cobalt in the vicinity of
the rings is studied using magnetic force microscopy and energy dispersive
spectroscopy. Double ring forma-tion is attributed to the interaction of
ablated material with the induced magnetic field during LAO. Steepness of
forward bias transport characteristics from the unperturbed region of the CMS
film suggest a non equilibrium spin contribution. Such mesoscopic textures in
magnetic films by AFM tip can be potentially used for memory storage
applications.Comment: 7 pages, 5 figure
Structure and function of negative feedback loops at the interface of genetic and metabolic networks
The molecular network in an organism consists of transcription/translation
regulation, protein-protein interactions/modifications and a metabolic network,
together forming a system that allows the cell to respond sensibly to the
multiple signal molecules that exist in its environment. A key part of this
overall system of molecular regulation is therefore the interface between the
genetic and the metabolic network. A motif that occurs very often at this
interface is a negative feedback loop used to regulate the level of the signal
molecules. In this work we use mathematical models to investigate the steady
state and dynamical behaviour of different negative feedback loops. We show, in
particular, that feedback loops where the signal molecule does not cause the
dissociation of the transcription factor from the DNA respond faster than loops
where the molecule acts by sequestering transcription factors off the DNA. We
use three examples, the bet, mer and lac systems in E. coli, to illustrate the
behaviour of such feedback loops.Comment: 8 pages, 4 figure
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