Phase estimation in the presence of phase diffusion: The qubit case

Berihu Teklu, Marco G. Genoni, Stefano Olivares, Matteo G.A. Paris

Research output: Contribution to journalConference articlepeer-review

32 Scopus citations


In this paper we address the estimation of the phase shift imposed on a qubit in the presence of phase diffusion. We evaluate the ultimate quantum limits to precision and determine optimal probes and measurements achieving those bounds. We also analyse in detail the performances of spin measurements and have found that although the corresponding Fisher information depends on the unknown value of the phase shift, we may still achieve the ultimate bound using a two-step adaptive method.

Original languageBritish English
Article number014062
JournalPhysica Scripta T
StatePublished - 2010
Event16th Central European Workshop on Quantum Optics, CEWQO2009 - Turku, Finland
Duration: 23 May 200927 May 2009


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