32,276 research outputs found
Algebraic and algorithmic frameworks for optimized quantum measurements
Von Neumann projections are the main operations by which information can be
extracted from the quantum to the classical realm. They are however static
processes that do not adapt to the states they measure. Advances in the field
of adaptive measurement have shown that this limitation can be overcome by
"wrapping" the von Neumann projectors in a higher-dimensional circuit which
exploits the interplay between measurement outcomes and measurement settings.
Unfortunately, the design of adaptive measurement has often been ad hoc and
setup-specific. We shall here develop a unified framework for designing
optimized measurements. Our approach is two-fold: The first is algebraic and
formulates the problem of measurement as a simple matrix diagonalization
problem. The second is algorithmic and models the optimal interaction between
measurement outcomes and measurement settings as a cascaded network of
conditional probabilities. Finally, we demonstrate that several figures of
merit, such as Bell factors, can be improved by optimized measurements. This
leads us to the promising observation that measurement detectors which---taken
individually---have a low quantum efficiency can be be arranged into circuits
where, collectively, the limitations of inefficiency are compensated for
High efficiency power amplifiers
Postprint (published version
Super-gain-boosted AB-AB fully differential Miller op-amp with 156dB open-loop gain and 174MV/V MHZ pF/uW figure of merit in 130nm CMOS technology
A fully differential Miller op-amp with a composite input stage using resistive local common-mode feedback and regulated cascode transistors is presented here. High gain pseudo-differential auxiliary amplifiers are used to implement the regulated cascode transistors in order to boost the output impedance of the composite input stage and the open-loop gain of the op-amp. Both input and output stages operate in class AB mode. The proposed op-amp has been simulated in a 130nm commercial CMOS process technology. It operates from a 1.2V supply and has a close to rail-to-rail differential output swing. It has 156dB DC open-loop gain and 63MHz gain-bandwidth product with a 30pF capacitive load. The op-amp has a DC open-loop gain figure of merit FOMAOLDC of 174 (MV/V) MHz pF/uW and large-signal figure of merit FOMLS of 3(V/us) pF/uW.This work was supported in part by the Spanish Government Agencia Estatal de Investigación (AEI) under Grant TEC2016-80396-C2, in
part by the Consejería de Economía y Conocimiento of Junta de Andalucía under Grant P18-FR-4317 (both projects received support from
the Fondo Europeo de Desarrollo Regional (FEDER)), and in part by the Consejo Nacional de Ciencia y Tecnologia (CONACyT)
under Grant A1-S-43214
Super-Gain-Boosted AB-AB Fully Differential Miller Op-Amp With 156dB Open-Loop Gain and 174MV/V MHZ pF/µW Figure of Merit in 130nm CMOS Technology
Article number 9400400A fully differential Miller op-amp with a composite input stage using resistive local
common-mode feedback and regulated cascode transistors is presented here. High gain pseudo-differential
auxiliary amplifiers are used to implement the regulated cascode transistors in order to boost the output
impedance of the composite input stage and the open-loop gain of the op-amp. Both input and output stages
operate in class AB mode. The proposed op-amp has been simulated in a 130nm commercial CMOS process
technology. It operates from a 1.2V supply and has a close to rail-to-rail differential output swing. It has
156dB DC open-loop gain and 63MHz gain-bandwidth product with a 30pF capacitive load. The op-amp
has a DC open-loop gain figure of merit FOMAOLDC of 174 (MV/V) MHz pF/µW and large-signal figure of
merit FOMLS of 3(V/µs) pF/µW.Consejería de Economía y Conocimiento of Junta de Andalucía P18-FR-4317Consejo Nacional de Ciencia y Tecnología (España) A1-S-43214Agencia Estatal de Investigación TEC2016-80396-C
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