PreprintCC BY-NC-SA 4.0arXiv
Evaluation of the quantum Fisher information for large systems via an ancilla
Abstract
Quantum Fisher information (QFI) is a fundamental quantity in quantum information and quantum mechanics, and evaluating it in various physical systems has become an important research topic. However, its evaluation in large systems still faces many challenges. Hereby we propose an ancilla-based protocol for evaluating the QFI of large systems and establish the conditions under which this protocol can ``perfectly'' evaluate the QFI in theory. As a demonstration, the protocol is applied to quantum circuits to evaluate the QFI of the Greenberger-Horne-Zeilinger state.
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BibTeX
@misc{liu2026evaluation,
title = {{Evaluation of the quantum Fisher information for large systems via an ancilla}},
author = {Qi Liu and Xin-Yu Hao and Jing Liu},
howpublished = {arXiv},
year = {2026},
month = oct,
doi = {10.48550/arxiv.2610.29146},
eprint = {2610.29146},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2610.29146},
note = {CC BY-NC-SA 4.0},
}
RIS
TY - UNPB
TI - Evaluation of the quantum Fisher information for large systems via an ancilla
AU - Qi Liu
AU - Xin-Yu Hao
AU - Jing Liu
PY - 2026
DA - 2026/10/21
PB - arXiv
DO - 10.48550/arxiv.2610.29146
UR - https://arxiv.org/abs/2610.29146
AB - Quantum Fisher information (QFI) is a fundamental quantity in quantum information and quantum mechanics, and evaluating it in various physical systems has become an important research topic. However, its evaluation in large systems still faces many challenges. Hereby we propose an ancilla-based protocol for evaluating the QFI of large systems and establish the conditions under which this protocol can ``perfectly'' evaluate the QFI in theory. As a demonstration, the protocol is applied to quantum circuits to evaluate the QFI of the Greenberger-Horne-Zeilinger state.
ER -