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Browsing University of Hertfordshire by Author "Rivas, A."
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Entanglement and Non-Markovianity of Quantum Evolutions
Rivas, A.; Huelga, S.F.; Plenio, M.B. (2010)We address the problem of quantifying the non-Markovian character of quantum time evolutions of general systems in contact with an environment. We introduce two different measures of non-Markovianity that exploit the ... -
Intrinsic metrological resolution as a distance measure and nonclassical light
Rivas, A.; Luis, A. (2008)We elaborate on a Hilbert-Schmidt distance measure assessing the intrinsic metrological accuracy in the detection of signals imprinted on quantum probe states by signal-dependent transformations. For small signals this ... -
Nonclassicality of states and measurements by breaking classical bounds on statistics
Rivas, A.; Luis, A. (2009)We derive exceedingly simple practical procedures revealing the quantum nature of states and measurements by the violation of classical upper bounds on the statistics of arbitrary measurements. Data analysis is minimum, ... -
Practical schemes for the measurement of angular-momentum covariance matrices in quantum optics
Rivas, A.; Luis, A. (2008)We develop practical schemes for the measurement of the covariance matrix for intrinsic angular-momentum variables in quantum optics. We particularize this approach to two-beam polarimetry and interferometry, as well as ... -
Probing a composite spin-boson environment
Oxtoby, N.P.; Rivas, A.; Huelga, S.F.; Fazio, R. (2009)We consider non-interacting multi-qubit systems as controllable probes of an environment of defects/impurities modelled as a composite spin-boson environment. The spin-boson environment consists of a small number of ... -
Stochastic resonance phenomena in spin chains
Rivas, A.; Oxtoby, N.P.; Huelga, S.F. (2009)We discuss stochastic resonance-like effects in the context of coupled quantum spin systems. We focus here on an information-theoretic approach and analyze the steady state quantum correlations (entanglement) as well as ...