Satoya Imai - Metrological usefulness of entanglement and nonlinear Hamiltonians

Metrological usefulness of entanglement and nonlinear Hamiltonians

This seminar, given by Satoya Imai, will happend on 05 November 2024, at 9:30. It will take place in Room Not specified.

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Abstract

A central task in quantum metrology is to exploit quantum correlations to outperform classical sensitivity limits. Metrologically useful entanglement is identified when the quantum Fisher information (QFI) exceeds a separability bound for a given parameter-encoding Hamiltonian. However, so far, only results for linear Hamiltonians are well-established. Here, we characterize metrologically useful entanglement for nonlinear Hamiltonians, presenting separability bounds for collective angular momenta. Also, we provide a general expression for entangled states maximizing the QFI, showing that these can be the superposition between the GHZ and singlet states. Finally, we compare the metrological usefulness of linear and nonlinear cases. Reference: https://arxiv.org/abs/2405.157 03 Website: https://sites.google.com/view/ satoyaimai/home