本領域のセミナーシリーズとして、2025年2月3日月曜日に、Satoya Imai氏によるセミナーが開催されます。セミナー情報は下記です。

Speaker: Satoya Imai (QSTAR, INO-CNR, and LENS)
Date: 2025年2月3日（月）13:30-
Place:電気通信大学　西10号館336号室

Title: Metrological usefulness of entanglement and nonlinear Hamiltonians
Abstract:

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