Abstract
Due to the limitations of quantum device manufacturing technology, the number of qubits in current quantum computing devices is still relatively limited. Distributed quantum computing, as an emerging quantum computing paradigm, aims to achieve larger-scale quantum computation. To reduce the cost of state transfer and routing in distributed quantum circuits, this paper focuses on the transmission direction of global gates generated after quantum circuit partitioning. We provide a threshold for the number of state transfers required for converting global gates to local gates in the entire circuit. We propose a method to evaluate the quality of transmission directions and utilize a genetic algorithm to find the optimal transmission directions for minimizing the transmission cost of distributed quantum circuit. Based on the optimized transmission directions, this paper maps the qubits in the logical circuit to a distributed quantum architecture model and presents a method for converting global gates to local gates in the quantum circuit. The routing process of distributed quantum circuits is simulated. Experimental results show that compared to existing methods for reducing the number of state transfers, the proposed algorithm can achieve a lower overall cost for executing distributed quantum circuits.
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Acknowledgements
The work was supported by the National Natural Science Foundation of China under Grant number 62072259, in part by the PhD Start-up Fund of Nantong University under Grant number 23B03, in part by the Postgraduate Research and Practice Innovation Program of Jiangsu Province under Grant number SJCX23_1780.
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Zilu Chen and Xinyu Chen provide conceptualization of the article. Zilu Chen and Yibo Jiang write software. Zilu Chen writes the main manuscript text. Xueyun Cheng and Zhijin Guan participate in writing comments and process supervision. Zhijin Guan is responsible for project management and providing financial support. All authors have reviewed and agreed to the published version of the manuscript.
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Chen, Z., Chen, X., Jiang, Y. et al. Routing Strategy for Distributed Quantum Circuit based on Optimized Gate Transmission Direction. Int J Theor Phys 62, 255 (2023). https://doi.org/10.1007/s10773-023-05489-4
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DOI: https://doi.org/10.1007/s10773-023-05489-4