Data di Pubblicazione:
2009
Citazione:
Bayesian estimation of one-parameter qubit gates / B.T. Gebrehiwot, S. Olivares, M. Paris. - In: JOURNAL OF PHYSICS. B, ATOMIC MOLECULAR AND OPTICAL PHYSICS. - ISSN 0953-4075. - 42:3(2009), pp. 035502.035502.1-035502.035502.6.
Abstract:
We address estimation of one-parameter unitary gates for qubit systems and seek optimal
probes and measurements. Single- and two-qubit probes are analysed in detail focusing on
precision and stability of the estimation procedure. Bayesian inference is employed and
compared with the ultimate quantum limits to precision, taking into account the biased nature
of the Bayes estimator in the non-asymptotic regime. In addition, through the evaluation of the
asymptotic a posteriori distribution for the gate parameter and a comparison with the results of
Monte Carlo simulated experiments, we show that asymptotic optimality of the Bayes
estimator is actually achieved after a limited number of runs. The robustness of the estimation
procedure against fluctuations of the measurement settings is investigated and the use of
entanglement to improve the overall stability of the estimation scheme is also analysed in some detail.
Tipologia IRIS:
01 - Articolo su periodico
Elenco autori:
B.T. Gebrehiwot, S. Olivares, M. Paris
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