99 citations · 164 across the 9 of their papers we have counts for
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Experimental Observation of Anomalous Complementary Weak Values from Correlated Pairwise Two-State Vectors
Qian Xie, Liang Xu, Lijian Zhang
Weak values (WVs) arise from weak measurements performed within a time-symmetric formulation of quantum mechanics, where a system is both pre- and post-selected. Anomalous WVs that…
Experimental Tabletop Petz recovery of a photonic qubit
Hui Li, Jinyan Chen, Yue Pan +4
The quantum information lost in open evolutions cannot be fully recovered, but partial recovery is possible. The Petz recovery map guarantees almost optimal recovery, notably if th…
Achieving the Multi-parameter Quantum Cramér-Rao Bound with Antiunitary Symmetry
Ben Wang, Kaimin Zheng, Qian Xie +3
The estimation of multiple parameters is a ubiquitous requirement in many quantum metrology applications. However, achieving the ultimate precision limit, i.e. the quantum Cramér-R…
Experimental Quantum Target Detection Approaching the Fundamental Helstrom Limit
Feixiang Xu, Xiao-Ming Zhang, Liang Xu +3
Quantum target detection is an emerging application that utilizes entanglement to enhance the sensing of the presence of an object. Although several experimental demonstrations for…
Improving the Precision of Optical Metrology by Detecting Fewer Photons
Peng Yin, Wen-Hao Zhang, Liang Xu +13
In optical metrological protocols to measure physical quantities, it is, in principle, always beneficial to increase photon number to improve measurement precision. However, practi…
Quantum-limited Localisation and Resolution in Three Dimensions
Ben Wang, Liang Xu, Lijian Zhang
As a method to extract information from optical system, imaging can be viewed as a parameter estimation problem. The fundamental precision in locating one emitter or estimating the…