PT symmetry and PT-enhanced quantum sensing in a spin-boson system

Jianming Wen; Pei-Rong Han; Wu Fan; Xin-Jie Huang; Zhen-Biao Yang; Shi-Biao Zheng

doi:10.1117/12.2657391

9 March 2023 PT symmetry and PT-enhanced quantum sensing in a spin-boson system

Jianming Wen, Pei-Rong Han, Wu Fan, Xin-Jie Huang, Zhen-Biao Yang, Shi-Biao Zheng

Proceedings Volume PC12447, Quantum Sensing, Imaging, and Precision Metrology; PC1244723 (2023) https://doi.org/10.1117/12.2657391
Event: SPIE Quantum West, 2023, San Francisco, California, United States

Abstract

Open systems, governed by non-Hermitian Hamiltonians, evolve fundamentally differently from their Hermitian counterparts and facilitate many unusual applications. Though non-Hermitian but parity-time (PT) symmetric dynamics has been realized in various classical or semiclassical systems, its fully quantum demonstration is still lacking. Here we engineer a highly controllable anti-Hermitian spin-boson model in a circuit QED structure composed of a decaying artificial atom (pseudospin) interacting with a bosonic mode stored in a microwave resonator. Besides observing abrupt changes in the spin-boson entanglement evolution and bifurcation transition in quantum Rabi splitting, we demonstrate super-sensitive quantum sensing by mapping the observable of interest to a hitherto unobserved PT-manifested entanglement evolution. These results pave the way for exploring non-Hermitian entanglement dynamics and PT-enhanced quantum sensing empowered by nonclassical correlations.

Conference Presentation

Citation Download Citation

Jianming Wen, Pei-Rong Han, Wu Fan, Xin-Jie Huang, Zhen-Biao Yang, and Shi-Biao Zheng "PT symmetry and PT-enhanced quantum sensing in a spin-boson system", Proc. SPIE PC12447, Quantum Sensing, Imaging, and Precision Metrology, PC1244723 (9 March 2023); https://doi.org/10.1117/12.2657391

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