Symmetry-protected many-body Ramsey spectroscopy: precision scaling and robustness

• URL: http://arxiv.org/abs/2509.08291v1
• Date: Wed, 10 Sep 2025 05:17:12 GMT
• Title: Symmetry-protected many-body Ramsey spectroscopy: precision scaling and robustness
• Authors: Sijie Chen, Jiahao Huang, Min Zhuang, Chaohong Lee,
• Abstract summary: We propose an entanglement-enhanced symmetry-protected destructive many-body Ramsey interferometry for precise parameter estimation.<n>Through matching the symmetry of input states and Hamiltonian, the spectral shift of Ramsey spectroscopy can be mitigated for both time-independent and time-dependent signals.
• Score: 3.594289973837809
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: Quantum entanglement is a powerful quantum resource for enhancing measurement precision beyond classical limit. % Here we propose an entanglement-enhanced symmetry-protected destructive many-body Ramsey interferometry for precise parameter estimation. % Through matching the symmetry of input states and Hamiltonian, the spectral shift of Ramsey spectroscopy caused by interparticle interaction, noise, decoherence and experimental imperfection can be mitigated for both time-independent and time-dependent signals, as explored in the companion Letter [S. Chen, et al., Ramsey Spectroscopy via Symmetry-Protected Destructive Many-Body Interferometry (submitted)]. % In this work, we show that symmetric entangled input states can further improve the measurement precision of symmetry-protected Ramsey spectroscopy without affecting the measurement accuracy. % Through inputting spin cat states and applying suitable interaction-based readout operations, the measurement precisions of time-independent and time-dependent signals can both approach the Heisenberg limit. % In particular, we systematically analyze how precision scaling and robustness depend on the input states, parameters, experimental imperfection and decoherence. % This work establishes a practical pathway to Heisenberg-limited quantum metrology with many-body Ramsey interferometry, offering resilience against realistic noise and imperfections.

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