Enhancement of sensitivity near exceptional points in dissipative qubit-resonator systems

• URL: http://arxiv.org/abs/2501.15769v1
• Date: Mon, 27 Jan 2025 04:36:57 GMT
• Title: Enhancement of sensitivity near exceptional points in dissipative qubit-resonator systems
• Authors: Pei-Rong Han, Fan Wu, Xin-Jie Huang, Huai-Zhi Wu, Chang-Ling Zou, Wei Yi, Mengzhen Zhang, Hekang Li, Kai Xu, Dongning Zheng, Heng Fan, Jianming Wen, Zhen-Biao Yang, Shi-Biao Zheng,
• Abstract summary: We propose and demonstrate a protocol for realizing non-Hermitian quantum sensors for probing the coupling between a qubit and a resonator subjecting to energy dissipations. The excitation-number conversion associated with the no-jump evolution trajectory enables removal of the noisy outcomes with quantum jumps. The sensitivity enhancement near the exceptional point is confirmed by both theoretical calculation and experimental measurement.
• Score: 10.877863413220087
• License:
• Abstract: Dissipation usually plays a negative role in quantum metrological technologies, which aim to improve measurement precision by leveraging quantum effects that are vulnerable to environment-induced decoherence. Recently, it has been demonstrated that dissipation can actually be used as a favorable resource for enhancing the susceptibility of signal detection. However, demonstrations of such enhancement for detecting physical quantities in open quantum systems are still lacking. Here we propose and demonstrate a protocol for realizing such non-Hermitian quantum sensors for probing the coupling between a qubit and a resonator subjecting to energy dissipations. The excitation-number conversion associated with the no-jump evolution trajectory enables removal of the noisy outcomes with quantum jumps, implementing the exceptional point (EP), where the Rabi splitting exhibits a divergent behavior in response to a tiny variation of the effective coupling. The sensitivity enhancement near the EP is confirmed by both theoretical calculation and experimental measurement.

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