2025.02.03. Gakuhen-B "Quantum Energy Innovation" Seminar Series (Satoya Imai)

As part of our area’s seminar series, a seminar by Satoya Imai will be held on Monday, February 3, 2025.

Details are as follows:

Speaker: Satoya Imai (QSTAR, INO-CNR, and LENS)
Date: 13:30- Monday, February 3, 2025
Place: Room 336, Building West 10, The University of Electro-Communications

Title: Metrological usefulness of entanglement and nonlinear Hamiltonians
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/2405.15703