NEC

About: NEC is a company organization based out in Tokyo, Japan. It is known for research contribution in the topics: Signal & Layer (electronics). The organization has 33269 authors who have published 57670 publications receiving 835952 citations. The organization is also known as: NEC Corporation & NEC Electronics Corporation.

Reduced phase error through optimized control of a superconducting qubit

Abstract: Minimizing phase and other errors in experimental quantum gates allows higher fidelity quantum processing. To quantify and correct for phase errors, in particular, we have developed an experimental metrology---amplified phase error (APE) pulses---that amplifies and helps identify phase errors in general multilevel qubit architectures. In order to correct for both phase and amplitude errors specific to virtual transitions and leakage outside of the qubit manifold, we implement ``half derivative,'' an experimental simplification of derivative reduction by adiabatic gate (DRAG) control theory. The phase errors are lowered by about a factor of five using this method to $~{1.6}^{\ifmmode^\circ\else\textdegree\fi{}}$ per gate, and can be tuned to zero. Leakage outside the qubit manifold, to the qubit $|2\ensuremath{\rangle}$ state, is also reduced to $~{10}^{\ensuremath{-}4}$ for $20%$ faster gates.

Transmission power control with dynamic step values

Abstract: Transmission power control with dynamic step value depending on a location of a mobile terminal in a radio zone is realized. The mobile terminal detects its location, whether close to a radio base station, a boundary of the radio zone, or an intermediate location, by an intensity of reception field strength of a radio signal transmitted by a radio base station. The radio base station, which has received and measured the radio signal quality transmitted by the mobile terminal, instructs the transmission power control information (increasing or decreasing) to the mobile terminal in accordance with the measured radio signal quality. When "decreasing" instructions are received repeatedly at the mobile terminal when the mobile terminal is located near the radio base station, a larger step value than a normal case is used for decreasing transmission power of the mobile terminal. When "increasing" instructions are received repeatedly at the mobile terminal when the mobile terminal is located in the boundary of the radio zone, a larger step value than the normal case is used for increasing transmission power of the mobile terminal.

Air cooling equipment for electronic systems

Abstract: An air cooling equipment for use in electronic systems having a plurality of wiring boards with a plurality of heat-generating electronic components mounted thereon is disclosed. The air cooling equipment uses two blowers positioned on top and bottom of the unit and introduces cooling air in two directions into the housing. The blowers may be positioned at sides of the housing and air is directed around and through the zone where the wiring boards are disposed.

Semiconductor integrated circuit

Abstract: PURPOSE: To provide a semiconductor integrated circuit in which a write-in command write-cycle can be shortened to one time when data of 16 bits are written with a write-in mode of 'x8 mode'. CONSTITUTION: This circuit is provided with a data take-in control section 30 which generates a convex pulse (one shot pulse) taking independently write-in data PD in respective input/output pins I/O8-I/O15 of the upper order side and input/output pins I/O0-I/O7 of the lower order side on the basis of the lowest order address £A-1| in a write-in address PA in a single command write-cycle in a write-in mode of 'x8 mode' into a non-volatile semiconductor 10. When a write-in command is inputted, write-in data take-in command cycle is repeated twice to take in write-in data PD for 16 input/output pins I/O in.