We exploit a recently constructed mapping between quantum circuits and graphs in order to prove that circuits corresponding to certain planar graphs can be efficiently simulated classically. The proof uses an expression for the Ising model partition function in terms of quadratically signed weight enumerators (QWGTs), which are polynomials that arise naturally in an expansion of quantum circuit...

To the Editor: The results of the study, “Impact of a Shielded Safety Syringe on Needlestick Injuries Among Healthcare Workers,” in the June 1992 issue (1992;13:349353) are encouraging. Technology that keeps the worker’s hands behind the needle at all times and covers the needle after use should significantly lower the rate of needlestick injuries. However, we noted the following inconsistencie...

Some applications of wireless sensor networks (WSN) require long-term deployments and vanishingly-small unit volumes to make them cost effective and unobtrusive. Energyand area-efficient circuits, as well as eliminating offchip components, are critical to meeting these objectives. A conventional WSN node can be fully integrated in CMOS except for the battery, crystal reference, and antenna. Typ...

Functions in arithmetic NC are known to have equivalent constant width polynomial degree circuits, but the converse containment is unknown. In a partial answer to this question, we show that syntactic multilinear circuits of constant width and polynomial degree can be depth-reduced, though the resulting circuits need not be syntactic multilinear. We then focus specifically on polynomial-size sy...

IW circuits are considered quasi3D (2,5D) metal-dielectric circuits. They have a high level of integration circuits, the metal and dielectric losses moderated and the precision of manufacturing for microwave applications [1]-[3]. The architecture of these structures consists in adding to the planar circuits a network of metallic via-hole integrated in the dielectric layer. The via-holes replace...

A novel compact, dual layer UWB monopole antenna is presented. This low profile ultrawideband antenna is fed by a 50 Ω shielded strip-line with an array of metal vias making the conducting walls. A printed disc monopole with a circular cut is the radiating element. The dual layer, shielded strip line feed allows for integration in multilayer technologies. The ultra-wideband, monopole characteri...