首页|Correction of microwave pulse reflection by digital filters in superconducting quantum circuits
Correction of microwave pulse reflection by digital filters in superconducting quantum circuits
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Reducing the control error is vital for high-fidelity digital and analog quantum operations.In superconducting circuits,one disagreeable error arises from the reflection of microwave signals due to impedance mismatch in the control chain.Here,we demonstrate a reflection cancelation method when considering that there are two reflection nodes on the control line.We propose to generate the pre-distortion pulse by passing the envelopes of the microwave signal through digital filters,which enables real-time reflection correction when integrated into the field-programmable gate array(FPGA).We achieve a reduction of single-qubit gate infidelity from 0.67％to 0.11％after eliminating microwave reflection.Real-time correction of microwave reflection paves the way for precise control and manipulation of the qubit state and would ultimately enhance the performance of algorithms and simulations executed on quantum processors.
CAS Key Laboratory of Quantum Information,University of Science and Technology of China,Hefei 230026,China
CAS Center for Excellence and Synergetic Innovation Center in Quantum Information and Quantum Physics,University of Science and Technology of China,Hefei 230026,China
Origin Quantum Computing Company Limited,Hefei 230088,China
Institute of Artificial Intelligence,Hefei Comprehensive National Science Center,Hefei 230088,China
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National Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaUSTC Center for Micro and Nanoscale Research and Fabrication
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