Abstract
Although the number of qubits in noisy intermediate scale quantum (NISQ) devices has been increased, they still face various physical restrictions, including nearest neighbor (NN) interaction and gate error. The NN interaction and the gate error affect the quantum circuit execution success rate. Since each gate of the CNOT circuit is composed of two qubits, its mapping and optimization are affected by these two constraints. In this paper, we present a physical constraint-aware CNOT quantum circuit synthesis and optimization approach. It consists of two components: the physical constraint-aware CNOT circuit synthesis and the matrix transformation-based optimization approach. The physical constraint-aware CNOT circuit synthesis uses a weighted Steiner tree to account for CNOT gate errors between adjacent qubits of the NISQ device. The matrix transformation-based optimization approach is to synthesize the transposed matrix, the flip matrix, and its transposed matrix according to the characteristics of the Boolean Matrix. The experimental results support the effectiveness of our strategy in enhancing circuit fidelity. Compared with existing methods, our solution can increase the success rate by 382.86% and reduce the number of gates by 58.3% on average.
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The data that support the findings of this study are available from https://github.com/M-qiangZhu/Physical-constraint-aware-CNOT-quantum-circuit-synthesis-and-optimization
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This work was supported by the National Natural Science Foundation of China under Grant 62072259, in part by Jiangsu Province Natural Science Foundation of China under Grant BK20151274, in part by Suqian Science and Technology Foundation under Grant S201819.
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Zhu, M., Cheng, X., Zhu, P. et al. Physical constraint-aware CNOT quantum circuit synthesis and optimization. Quantum Inf Process 22, 10 (2023). https://doi.org/10.1007/s11128-022-03716-1
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DOI: https://doi.org/10.1007/s11128-022-03716-1