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Chin. Phys. B, 2022, Vol. 31(11): 114204    DOI: 10.1088/1674-1056/ac8737

Experimental demonstration of a fast calibration method for integrated photonic circuits with cascaded phase shifters

Junqin Cao(曹君勤), Zhixin Chen(陈志歆), Yaxin Wang(王亚新), Tianfeng Feng(冯田峰), Zhihao Li(李志浩), Zeyu Xing(邢泽宇), Huashan Li(李华山), and Xiaoqi Zhou(周晓祺)
School of Physics and State Key Laboratory of Optoelectronic Materials and Technologies, Sun Yat-sen University, Guangzhou 510000, China
Abstract  With the development of research on integrated photonic quantum information processing, the integration level of the integrated quantum photonic circuits has been increasing continuously, which makes the calibration of the phase shifters on the chip increasingly difficult. For the calibration of multiple cascaded phase shifters that is not easy to be decoupled, the resources consumed by conventional brute force methods increase exponentially with the number of phase shifters, making it impossible to calibrate a relatively large number of cascaded phase shifters. In this work, we experimentally validate an efficient method for calibrating cascaded phase shifters that achieves an exponential increase in calibration efficiency compared to the conventional method, thus solving the calibration problem for multiple cascaded phase shifters. Specifically, we experimentally calibrate an integrated quantum photonic circuit with nine cascaded phase shifters and achieve a high-precision calibration with an average fidelity of 99.26%.
Keywords:  cascaded phase shifters      calibration      quantum photonic chip  
Received:  02 June 2022      Revised:  20 July 2022      Accepted manuscript online:  05 August 2022
PACS:  42.82.-m (Integrated optics)  
  03.67.-a (Quantum information)  
Fund: Project supported by the National Key Research and Development Program of China (Grant No. 2017YFA0305200), the Key Research and Development Program of Guangdong Province, China (Grant Nos. 2018B030329001 and 2018B030325001), and the National Natural Science Foundation of China (Grant No. 61974168).
Corresponding Authors:  Xiaoqi Zhou     E-mail:

Cite this article: 

Junqin Cao(曹君勤), Zhixin Chen(陈志歆), Yaxin Wang(王亚新), Tianfeng Feng(冯田峰), Zhihao Li(李志浩), Zeyu Xing(邢泽宇), Huashan Li(李华山), and Xiaoqi Zhou(周晓祺) Experimental demonstration of a fast calibration method for integrated photonic circuits with cascaded phase shifters 2022 Chin. Phys. B 31 114204

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