Experimentally Ruling Out Joint Reality Based on Locality with Device-Independent Steering  

作　　者：Shuaining Zhang Xiang Zhang Zhiyue Zheng Wei Zhang 

机构地区：[1]Beijing Academy of Quantum Information Sciences,Beijing 100193,China [2]Department of Physics and Beijing Key Laboratory of Opto-electronic Functional Materials and Micro-nano Devices,Renmin University of China,Beijing 100872,China [3]Key Laboratory of Quantum State Construction and Manipulation(Ministry of Education),Renmin University of China,Beijing 100872,China

出　　处：《Chinese Physics Letters》2024年第1期1-5,共5页中国物理快报（英文版）

基　　金：supported by the National Natural Science Foundation of China(Grant Nos.12074427,12074428,12204535,and 92265208);the National Key R&D Program of China(Grant Nos.2018YFA0306501 and 2022YFA1405301).

摘　　要：As an essential concept to understand the world,whether the real values(or physical realities)of observables are suitable to physical systems beyond the classic has been debated for many decades.Although standard nogo results based on Bell inequalities have ruled out the joint reality of incompatible quantum observables,the possibility of giving simple yet strong arguments to rule out joint reality in any physical system(not necessarily quantum)with weaker assumptions and less observables has been explored and proposed recently.Here,we perform a device-independent experiment on a two-qubit superconducting system to show that the joint reality of two observables is incompatible with locality under the weaker assumption of the reality of observables in a single space-time region(or single qubit).Our results clearly show the violation of certain inequalities derived from both linear and nonlinear criteria.In addition,we study the robustness of the linear and nonlinear criterion against the effect of systematic decoherence.Our demonstration opens up the possibility of delineating classical and non-classical boundaries with simpler nontrivial quantum system.

关 键 词：OBSERVABLE QUANTUM system 

分 类 号：O413[理学—理论物理]