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Quantum State Engineering of Light with Continuous-wave Optical Parametric Oscillators
Published on: May 30, 2014
Generalized limits for single-parameter quantum estimation
Sergio Boixo1, Steven T Flammia, Carlton M Caves
1Department of Physics and Astronomy, University of New Mexico, Albuquerque, New Mexico 87131, USA.
Abstract:
We develop generalized bounds for quantum single-parameter estimation problems for which the coupling to the parameter is described by intrinsic multisystem interactions. For a Hamiltonian with k-system parameter-sensitive terms, the quantum limit scales as 1/Nk, where N is the number of systems. These quantum limits remain valid when the Hamiltonian is augmented by any parameter-independent interaction among the systems and when adaptive measurements via parameter-independent coupling to ancillas are allowed.
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