中国物理B ›› 2025, Vol. 34 ›› Issue (7): 70305-070305.doi: 10.1088/1674-1056/adde33
Xu-Hao Yu(余旭豪)†, Ying Wei(韦颖)†, Ran Yang(杨然), Wen-Hui Song(宋文慧), Yingning Miao(缪应宁), Wei Zhou(周唯), Xinhui Li(李新慧), Xiaoqin Gao(高小钦), Yan-Xiao Gong(龚彦晓)‡, and Shi-Ning Zhu(祝世宁)
Xu-Hao Yu(余旭豪)†, Ying Wei(韦颖)†, Ran Yang(杨然), Wen-Hui Song(宋文慧), Yingning Miao(缪应宁), Wei Zhou(周唯), Xinhui Li(李新慧), Xiaoqin Gao(高小钦), Yan-Xiao Gong(龚彦晓)‡, and Shi-Ning Zhu(祝世宁)
摘要: The estimation of quantum phase differences plays an important role in quantum simulation and quantum computation, yet existing quantum phase estimation algorithms face critical limitations in noisy intermediate-scale quantum (NISQ) devices due to their excessive depth and circuit complexity. We demonstrate a high-precision phase difference estimation protocol based on the Bayesian phase difference estimation algorithm and single-photon projective measurement. The iterative framework of the algorithm, combined with the independence from controlled unitary operations, inherently mitigates circuit depth and complexity limitations. Through an experimental realization on the photonic system, we demonstrate high-precision estimation of diverse phase differences, showing root-mean-square errors (RMSE) below the standard quantum limit $\mathcal{O}(1/\sqrt{N})$ and reaching the Heisenberg scaling $\mathcal{O}(1/N)$ after a certain number of iterations. Our scheme provides a critical advantage in quantum resource-constrained scenarios, and advances practical implementations of quantum information tasks under realistic hardware constraints.
中图分类号: (Quantum computation architectures and implementations)