6,879 research outputs found
Quantum entanglement and fixed-point bifurcations
How does the classical phase space structure for a composite system relate to
the entanglement characteristics of the corresponding quantum system? We
demonstrate how the entanglement in nonlinear bipartite systems can be
associated with a fixed point bifurcation in the classical dynamics. Using the
example of coupled giant spins we show that when a fixed point undergoes a
supercritical pitchfork bifurcation, the corresponding quantum state - the
ground state - achieves its maximum amount of entanglement near the critical
point. We conjecture that this will be a generic feature of systems whose
classical limit exhibits such a bifurcation.Comment: v2: Structure of the paper changed for clarity, reduced length, now 9
pages with 6 figure
NMR Knight shifts and linewidths in the Ni‐Pd‐P and Ni‐Pt‐P metallic glasses: Composition and temperature dependences
NMR Knight shift and linewidth measurements are reported for the ^(31)P nuclei in the metallic glasses (Ni_(0.50)Pd_(0.50))100−_xP_x (where x=16 to 26.5) and (Ni_yPd_(1−y))_(80)P_(20) (where y=0.20 to 0.80), and both the ^(31)P and 195Pt nuclei in the metallic glass (Ni_yPt_(1−y))_(75)P_(25) (where y=0.20 to 0.68). The results are discussed in terms of the amorphous structure, electronic structure, and stability of transition metal + metalloid metallic glasses
Improving Inferential Comprehension Through Semantic Webbing
The author identified a key strategy for teaching inferential comprehension as implemented in a 7th grade classroom of students who were, at least, one year below grade in reading. The purpose was to improve the students\u27 inferential comprehension skills. The implementation began with a diagnostic reading test followed by several weeks of introducing different forms of semantic webbing to help clarify basal reader stories and other activities. After a mid-point teacher-made exam showed good results, the author implemented a few more weeks of webbing before a final diagnostic reading test was given to monitor progress. A comparison of the beginning and ending test scores indicated 33 percent of the students showed a 5 point increase in percentile rank. Results indicate semantic webbing to be an effective tool for improving the inferential comprehension of many students
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Fault-tolerant quantum computation versus Gaussian noise
We study the robustness of a fault-tolerant quantum computer subject to
Gaussian non-Markovian quantum noise, and we show that scalable quantum
computation is possible if the noise power spectrum satisfies an appropriate
"threshold condition." Our condition is less sensitive to very-high-frequency
noise than previously derived threshold conditions for non-Markovian noise.Comment: 30 pages, 6 figure
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