There are many cases where the interaction between two qubits is not precisely known, but single-qubit operations are available. In this Letter we show how, regardless of an incomplete knowledge of the strength or form of the interaction between two qubits, it is often possible to construct a controlled-NOT gate which has arbitrarily high fidelity. In particular, we show that oscillations in th...

Multiple meiosis-specific cohesion proteins act to facilitate homolog segregation at the first meiotic division. A recent paper demonstrates that meiotic cohesins can be separated into two complexes, one that establishes and maintains intersister cohesion and one that promotes interhomolog adhesion by regulating synaptonemal complex assembly.

What follows are some skeptical thoughts on the first part of this rich and illuminating paper. My lack of comments on the second part should not indicate lack of interest, but instead reflect (a) that there is more than enough to discuss in the first part, and (b) it is unlikely that anything I can say about the second would be news to the linguists present at this meeting. I should also add t...

A self-contained approach to studying the unitary evolution of coupled qubits is introduced, capable of addressing a variety of physical systems described by exchange Hamiltonians containing Rabi terms. The method automatically determines both the Weyl chamber steering trajectory and the accompanying local rotations. Particular attention is paid to the case of anisotropic exchange with tracking...

ISSUES AND PURPOSE School nursing has changed dramatically over the past 25 years. The complex social and physical needs of children require an expanded role with advanced knowledge and skills. The school nurse functions as health promoter, health educator, collaborator, and researcher. Issues related to advanced practice and policy development also affect school nursing practice. CONCLUSIONS...