982 research outputs found
A chaotic switched-capacitor circuit for characteristic CMOS noise distributions generation
A switched-capacitor circuit is proposed for the generation of noise resembling the typical noise spectral density of MOS devices. The circuit is based on the combination of two chaotic maps, one generating 1/f noise (hopping map) and the other generating white noise (Bernoulli map). Through a programmable weighted adder stage, the contribution of each map can be controlled and, thereby, the position of the corner frequency. Behavioral models simulations were carried out to prove the correct functionality of the proposed approach.Ministerio de Economía y Competitividad TEC2016-80923-
Entanglement in an expanding spacetime
We show that a dynamical spacetime generates entanglement between modes of a
quantum field. Conversely, the entanglement encodes information concerning the
underlying spacetime structure, which hints at the prospect of applications of
this observation to cosmology. Here we illustrate this point by way of an
analytically exactly soluble example, that of a scalar quantum field on a
two-dimensional asymptotically flat Robertson-Walker expanding spacetime. We
explicitly calculate the entanglement in the far future, for a quantum field
residing in the vacuum state in the distant past. In this toy universe, it is
possible to fully reconstruct the parameters of the cosmic history from the
entanglement entropy.Comment: 4 pages, no figures; I. F-S published previously under Fuentes-Gurid
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