We describe operational challenges and progress of optical frequency-comb dividers (OFDs) that synthesize RF signals from the optical domain. Our priorities include: (1) ultra-low phase-noise, (2) continuous operation, and (3) broadly low Allan deviation.

The aim of this work is to improve the digital images quality, in particular those relating to the Turin Shroud. ù The problem with Shroud images is that they are characterised by very low variations of the luminance of the various pixels. These almost unperceptible variations, cause great difficulty in analysing the images with the naked eye. Therefore some kind of elaboration becomes necessar...

In this paper we investigate multiplicative noise models in the context of continuous optimization. We illustrate how some intrinsic properties of the noise model imply the failure of reasonable search algorithms for locating the optimum of the noiseless part of the objective function. Those findings are rigorously investigated on the (1 + 1)-ES for the minimization of the noisy sphere function...

When noise is present in a scattering system, particles tend to escape faster from the scattering region as compared with the noiseless case. For chaotic scattering, noise can render particle-decay exponential, and the decay rate typically increases with the noise intensity. We uncover a scaling law between the exponential decay rate and the noise intensity. The finding is substantiated by a he...

We have experimentally demonstrated polarization entanglement using continuous variables in an ultra-short pulsed laser system at the telecommunications wavelength of 1.5 μm. Exploiting the Kerr non-linearity of a glass fibre we generated a polarization squeezed pulse with Ŝ2 as the only non-zero Stokes parameter thus Ŝ1 and Ŝ3 being the conjugate pair. Polarization entanglement was generated b...

Proper modelling of astronomical receivers is vital: it describes the systematic errors in the raw data, guides the receiver design process, and assists data calibration. In this paper, we describe a method of analytically modelling the full signal and noise behaviour of arbitrarily complex radio receivers. We use electrical scattering matrices to describe the signal behaviour of individual com...

Jacobian Adaptation (JA) of the acoustic models is a fast adaptation technique that has been successfully used in both speech and speaker recognition systems. This technique adapts the acoustic models on the basis of the difference between the testing and the training noise conditions. For this reason, a noise reference of both the training and the testing phase is needed. In previous works, th...

A receiver is developed for MAP symbol detection of a burst (i.e., nite-length) CPM signal received in additive white Gaussian noise. This minimum probability of symbol error receiver requires the entire burst of data and involves the use of both forward and backward recursions. Performance results are provided comparing the MAP symbol detector to the more commonly used ML sequence detector (i....