Entanglement and Sensitivity in Precision Measurements with States of a Fluctuating Number of Particles

Year: 2010

Authors: Hyllus P., Pezzé L., Smerzi A.

Autors Affiliation: INO-CNR BEC Center and Dipartimento di Fisica, Università di Trento, I-38123 Povo, Italy;
Laboratoire Charles Fabry de l’Institut d’Optique, CNRS and Univ. Paris-Sud, Campus Polytechnique, RD 128, F-91127 Palaiseau cedex, France

Abstract: The concepts of separability, entanglement, spin squeezing, and the Heisenberg limit are central in the theory of quantum-enhanced metrology. In the current literature, these are well established only in the case of linear interferometers operating with input quantum states of a known fixed number of particles. This manuscript generalizes these concepts and extends the quantum phase estimation theory by taking into account classical and quantum fluctuations of the particle number. Our analysis concerns most of the current experiments on precision measurements where the number of particles is known only on average.


Volume: 105 (12)      Pages from: 120501  to: 120501

KeyWords: quantum interferometry; heisenberg limit; entaglement
DOI: 10.1103/PhysRevLett.105.120501

Citations: 81
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