Abstract
We discuss the accuracy of phase estimation for single-qubit and multi-qubit systems under energy conservation constraints. For the case where both the target and the auxiliary system are qubits, we analytically maximize the FI over all possible energy-conserving joint measurements and auxiliary states, and derive the form of optimal measurement and state. Then, we generalize the results to the case where the auxiliary system is d-dimensional and discover that the achievable FI can approximate quantum Fisher information for large d. Finally, we discuss the difference between global and local measurements when considering multi-qubit target systems. Our results can contribute to the study of restrictions of conservation laws on quantum measurements.
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Acknowledgements
This work was supported by National Natural Science Foundation of China under Grant No. 11774205 and the Young Scholars Program of Shandong University.
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XH contributed to the study conception. All authors contributed to the main conclusions of the article. The first draft of the manuscript was written by SH and all authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.
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Han, S., Hu, X. Phase estimation Under energy conservation. Quantum Inf Process 22, 178 (2023). https://doi.org/10.1007/s11128-023-03948-9
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DOI: https://doi.org/10.1007/s11128-023-03948-9