Low-latency readout electronics for dynamic superconducting quantum computing
Cheng Guo,
Jin Lin,
Lian-Chen Han,
Na Li,
Li-Hua Sun,
Fu-Tian Liang,
Dong-Dong Li,
Yu-Huai Li,
Ming Gong,
Yu Xu,
Sheng-Kai Liao,
Cheng-Zhi Peng
Affiliations
Cheng Guo
Department of Modern Physics, University of Science and Technology of China, Hefei 230026, China
Jin Lin
Shanghai Branch, CAS Center for Excellence in Quantum Information and Quantum Physics, University of Science and Technology of China, Shanghai 201315, China
Lian-Chen Han
Department of Modern Physics, University of Science and Technology of China, Hefei 230026, China
Na Li
Shanghai Branch, CAS Center for Excellence in Quantum Information and Quantum Physics, University of Science and Technology of China, Shanghai 201315, China
Li-Hua Sun
Department of Modern Physics, University of Science and Technology of China, Hefei 230026, China
Fu-Tian Liang
Shanghai Branch, CAS Center for Excellence in Quantum Information and Quantum Physics, University of Science and Technology of China, Shanghai 201315, China
Dong-Dong Li
Shanghai Branch, CAS Center for Excellence in Quantum Information and Quantum Physics, University of Science and Technology of China, Shanghai 201315, China
Yu-Huai Li
Shanghai Branch, CAS Center for Excellence in Quantum Information and Quantum Physics, University of Science and Technology of China, Shanghai 201315, China
Ming Gong
Shanghai Branch, CAS Center for Excellence in Quantum Information and Quantum Physics, University of Science and Technology of China, Shanghai 201315, China
Yu Xu
Shanghai Branch, CAS Center for Excellence in Quantum Information and Quantum Physics, University of Science and Technology of China, Shanghai 201315, China
Sheng-Kai Liao
Department of Modern Physics, University of Science and Technology of China, Hefei 230026, China
Cheng-Zhi Peng
Department of Modern Physics, University of Science and Technology of China, Hefei 230026, China
Dynamic quantum computing can support quantum error correction circuits to build a large general-purpose quantum computer, which requires electronic instruments to perform the closed-loop operation of readout, processing, and control within 1% of the qubit coherence time. In this paper, we present low-latency readout electronics for dynamic superconducting quantum computing. The readout electronics use a low-latency analog-to-digital converter to capture analog signals, a field-programmable gate array (FPGA) to process digital signals, and the general I/O resources of the FPGA to forward the readout results. Running an algorithm based on the design of multichannel parallelism and single instruction multiple data on an FPGA, the readout electronics achieve a readout latency of 40 ns from the last sample input to the readout valid output. The feedback data link for cross-instrument communication shows a communication latency of 48 ns when 16 bits of data are transmitted over a 2 m-length cable using a homologous clock to drive the transceiver. With codeword-based triggering mechanisms, readout electronics can be used in dynamic superconducting quantum computing.
