In this paper, a reset charge sensitive amplifier (RCSA) is designed for the gamma-ray spectrometer with a NaI(Tl)+PMT structure. The time constant of the output signal of the front-end readout circuit of a traditional gamma-ray spectrometer with a NaI(Tl)+PMT structure is affected by temperature, measurement environment and the signal transmission cable, so it is difficult to get a good resolution spectrum, especially at higher counting rates. Zeng, Guoqiang Tan, Chengjun Li, Qiang Ge, Liangquan Liu, Xiyao Luo, Qun International Nuclear Information System (INIS) Reset charge sensitive amplifier for NaI(Tl) gamma-ray spectrometer Using our open GRAPE implementation, we obtain pulse shapes, leading to a reset time over 4 times faster than passive reset. In this problem, the shape of a microwave pulse is optimized such as to empty the cavity from measurement photons as fast as possible.

As a practical example, we apply this open-system optimization method to active reset of a readout resonator in circuit QED.

This speedup, as well as the reduced memory requirements of our implementation, are illustrated by comparison to a standard implementation of open GRAPE. While typical implementations of optimal control algorithms for open quantum systems rely on explicit matrix exponential calculations, our implementation avoids these operations, leading to a polynomial speedup of the open GRAPE algorithm in cases of interest. We study an implementation of the open GRAPE (gradient ascent pulse engineering) algorithm well suited for large open quantum systems. Resonator reset in circuit QED by optimal control for large open quantum systemsīoutin, Samuel Andersen, Christian Kraglund Venkatraman, Jayameenakshi Ferris, Andrew J.

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