Extending the dynamic range in quantum frequency estimation with sequential weak measurements

• URL: http://arxiv.org/abs/2509.01474v1
• Date: Mon, 01 Sep 2025 13:42:17 GMT
• Title: Extending the dynamic range in quantum frequency estimation with sequential weak measurements
• Authors: Su Direkci, Manuel Endres, Tuvia Gefen,
• Abstract summary: We study schemes to extend the dynamic range and overcome phase slip noise through weak measurements with ancilla qubits.<n>We find optimal weak measurements protocols: we identify optimal measurement strength for any given optical number of atoms.<n>Then we combine weak and projective measurements to construct a protocol that saturates the noiseless precision limits, and outperforms previously proposed methods for phase slip noise suppression.
• Score: 0.10923877073891443
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: Quantum metrology explores optimal quantum protocols for parameter estimation. In the context of optical atomic clocks, conventional protocols focus on optimal input states and measurements to achieve enhanced sensitivities. However, such protocols are typically limited by phase slip errors inflicted due to the decoherence of the local oscillator. Here, we study schemes to extend the dynamic range and overcome phase slip noise through weak measurements with ancilla qubits. Using coherent spin states, we find optimal weak measurements protocols: we identify optimal measurement strength for any given interrogation time and number of atoms. Then, we combine weak and projective measurements to construct a protocol that asymptotically saturates the noiseless precision limits, and outperforms previously proposed methods for phase slip noise suppression.

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