The control problem for aircraft in rapid roll is analyzed. A 5-DOF modelis used to derive a decoupling control law of roll, pitch and sideslip angular velocitiesaccording to the nonlinear decoupling theory. The stabi...The control problem for aircraft in rapid roll is analyzed. A 5-DOF modelis used to derive a decoupling control law of roll, pitch and sideslip angular velocitiesaccording to the nonlinear decoupling theory. The stability of the closed-loop system isdiscussed. A method to stabilize the whole system when some fixed dynamics areunstable is given. Simulations are perfonned.展开更多
The Nitrogen Vacancy （NV） center is becoming a promising qubit for quantum information processing. The defect has a long coherence time at room temperature and it allows spin state initialized and read out by laser ...The Nitrogen Vacancy （NV） center is becoming a promising qubit for quantum information processing. The defect has a long coherence time at room temperature and it allows spin state initialized and read out by laser and manipulated by microwave pulses. It has been utilized as a ultra sensi- tive probe for magnetic fields and remote spins as well. Here, we review the recent progresses in experimental demonstrations based on NV centers. We first introduce our work on implementation of the Deutsch- Jozsa algorithm with a single electronic spin in diamond. Then the quantum nature of the bath around the center spin is revealed and continuous wave dynamical decoupling has been demonstrated. By applying dynamical decoupling, a multi-pass quantum metrology protocol is realized to enhance phase estimation. In the final, we demonstrated NV center can be regarded as a ultra-sensitive sensor spin to implement nuclear magnetic resonance （NMR） imaging at nanoscale.展开更多
文摘The control problem for aircraft in rapid roll is analyzed. A 5-DOF modelis used to derive a decoupling control law of roll, pitch and sideslip angular velocitiesaccording to the nonlinear decoupling theory. The stability of the closed-loop system isdiscussed. A method to stabilize the whole system when some fixed dynamics areunstable is given. Simulations are perfonned.
基金Acknowledgements This work was supported by the National Key Basic Research Program of China （Grant No. 2013CB921800）, the National Natural Science Foundation of China （Grant Nos. 11227901, 11275183, 91021005, and 10834005）, the ＇Strategic Priority Research Program （B）＇ of the CAS （Grant No. XDB01030400） and the Fundamental Research Funds for the Central Universities.
文摘The Nitrogen Vacancy （NV） center is becoming a promising qubit for quantum information processing. The defect has a long coherence time at room temperature and it allows spin state initialized and read out by laser and manipulated by microwave pulses. It has been utilized as a ultra sensi- tive probe for magnetic fields and remote spins as well. Here, we review the recent progresses in experimental demonstrations based on NV centers. We first introduce our work on implementation of the Deutsch- Jozsa algorithm with a single electronic spin in diamond. Then the quantum nature of the bath around the center spin is revealed and continuous wave dynamical decoupling has been demonstrated. By applying dynamical decoupling, a multi-pass quantum metrology protocol is realized to enhance phase estimation. In the final, we demonstrated NV center can be regarded as a ultra-sensitive sensor spin to implement nuclear magnetic resonance （NMR） imaging at nanoscale.
