Mitigating Detuning-Induced Systematic Errors in Entanglement-Enhanced Metrology

• URL: http://arxiv.org/abs/2510.16739v1
• Date: Sun, 19 Oct 2025 07:32:11 GMT
• Title: Mitigating Detuning-Induced Systematic Errors in Entanglement-Enhanced Metrology
• Authors: Shingo Kukita, Yuichiro Matsuzaki,
• Abstract summary: Greenberger-Horne-Zeilinger (GHZ) states can, in principle, attain the Heisenberg limit that surpasses the standard quantum limit.<n>Here, we analyze the effect of detuning between actual and nominal spin in a GHZ-state preparation scheme employing a frequency selective pulse.<n>We show that detuning induces coherent, systematic error that prevents GHZ sensing from reaching the Heisenberg limit.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Quantum sensing leverages non-classical resources to enhance precision. In particular, Greenberger-Horne-Zeilinger (GHZ) states can, in principle, attain the Heisenberg limit that surpasses the standard quantum limit. While many studies have examined how open-system noise-typically modeled with Lindblad master equations-degrades GHZ-based metrology, coherent control imperfections during state preparation and readout have received less attention. Here, we analyze the effect of detuning between actual and nominal spin frequencies in a GHZ-state preparation scheme employing a frequency selective pulse. We show that detuning induces coherent, systematic error that prevents GHZ sensing from reaching the Heisenberg limit. To mitigate this effect, we design a composite-pulse protocol that compensates for detuning-induced errors and improves the sensitivity under the effect of coherent error.

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