Bell-CHSH function approach to quantum phase transitions in matrix product systems

Recently, nonlocality and Bell inequalities have been used to investigate quantum phase transitions (QPTs) in low-dimensional quantum systems. Nonlocality can be detected by the Bell-CHSH function (BCF). In this work, we extend the study of BCF to the QPTs in matrix product systems (MPSs). In this kind of QPTs, the ground-state energy keeps analytical in the vicinity of the QPT points, and is usually called the MPS-QPTs. For several typical models, our results show that BCF can signal the MPS-QPTs very well. In addition, we find BCF can capture signal of QPTs in unentangled states and classical states, for which other measures of quantum correlation (quantum entanglement and quantum discord) fail. Furthermore, we find that in these MPSs, there exists some kind of quantum correlation which cannot be characterized by entanglement, or by nonlocality.Comment: 12 pages, 4 figure

Nonadiabatic holonomic quantum gates based on the surface electron

The nonadiabatic holonomic quantum computation based on the geometric phase is robust against the built-in noise and decoherence. In this work, we theoretically propose a scheme to realize nonadiabatic holonomic quantum gates in a surface electron system, which is a promising two-dimensional platform for quantum computation. The holonomic gate is realized by a three-level structure that combines the Rydberg states and spin states via an inhomogeneous magnetic field. After a cyclic evolution, the computation bases pick up different geometric phases and thus perform a geometric gate. Only the electron with spin up experiences the geometric gate, while the electron with spin down is decoupled from the state-selective driving fields. The controlled-NOT gate encoded on the Rydberg states and spin states is then put into practice. The fidelity of the output state exceeds 0.99 with experimentally achievable parameters

横纹肌溶解症患者整体护理

Objective: To discuss the overall care plan of patients with rhabdomyolysis. Methods: Combining retrospective investigation with evidence-based nursing method, care measures of patients with rhabdomyolysis in clinical practice were analyzed, and care results were evaluated timely. Results: 16 patients were discharged, among whom 15 patients’ exercise abilities were fully recovered. Conclusion: Carrying out overall care, standardize care processes and methods is very important for rehabilitation of patients with rhabdomyolysis.目的  探讨横纹肌溶解症患者的整体护理方案。方法  采取回顾性调查和循证护理相结合的方法，分析在临床实践中遇到的横纹肌溶解症患者及其需要采取的护理措施，落实整体护理，并及时评价护理效果。结果  16例患者均康复出院，除一例患者运动能力未康复外，其他患者均完全康复。结论  实施整体护理、规范护理流程和护理方法对横纹肌溶解症患者的顺利康复有重要意义

4-[3-(Chloro­meth­yl)-1,2,4-oxadiazol-5-yl]pyridine. Corrigendum

Corrigendum to Acta Cryst. (2007), E63, o4654