含三体相互作用XX模型的测量诱导非局域性

Measurement-induced nonlocality in the XX model with three-site interactions

利用Bures距离测量诱导非局域性的概念研究含三体相互作用海森堡XX链的非局域性,讨论增强系统边界量子比特之间测量诱导非局域性的可调参数。对有限温度下的系统热平衡态,通过优化调节XZX+YZY或XZY-YZX型三体相互作用的强度和外加匀强磁场的强度,对应边界量子比特之间的Bures距离测量诱导非局域性得到有效提高。该结论可用于实现量子自旋系统的非局域性调控。

Nonlocal properties of the Heisenberg XX model with three-site interactions is investigated by using the concept of Bures distance measurement-induced nonlocality（MIN）,where more attention is paid on the identification of valid system parameters which can be used for enhancing nonlocality of the boundary qubits.For thermal states of the considered system at finite temperature,the Bures MIN can be enhanced evidently by optimizing strengths of the XZX＋YZY or XZY-YZX type three-site interactions and the external magnetic fields.This finding provides a feasible way for tuning nonlocality in the quantum spin system.