Experimental Simulation of Larger Quantum Circuits with Fewer Superconducting Qubits

Experimental Simulation of Larger Quantum Circuits with Fewer Superconducting Qubits

Ying, Chong (University of Science and Technology of China)
Cheng, Bin (University of Technology Sydney; Southern University of Science and Technology)
Zhao, Youwei (University of Science and Technology of China)
Huang, He Liang (University of Science and Technology of China; Henan Key Laboratory of Quantum Information and Cryptography, Zhengzhou)
Zhang, Y.N. (TU Delft QID/Dobrovitski Group; Southern University of Science and Technology)
Gong, Ming (University of Science and Technology of China)
Wu, Yulin (University of Science and Technology of China)
Wang, S. (University of Science and Technology of China)
Liang, Futian (University of Science and Technology of China)

2023

Although near-term quantum computing devices are still limited by the quantity and quality of qubits in the so-called NISQ era, quantum computational advantage has been experimentally demonstrated. Moreover, hybrid architectures of quantum and classical computing have become the main paradigm for exhibiting NISQ applications, where low-depth quantum circuits are repeatedly applied. In order to further scale up the problem size solvable by the NISQ devices, it is also possible to reduce the number of physical qubits by "cutting"the quantum circuit into different pieces. In this work, we experimentally demonstrated a circuit-cutting method for simulating quantum circuits involving many logical qubits, using only a few physical superconducting qubits. By exploiting the symmetry of linear-cluster states, we can estimate the effectiveness of circuit-cutting for simulating up to 33-qubit linear-cluster states, using at most 4 physical qubits for each subcircuit. Specifically, for the 12-qubit linear-cluster state, we found that the experimental fidelity bound can reach as much as 0.734, which is about 19% higher than a direct implementation on the same 12-qubit superconducting processor. Our results indicate that circuit-cutting represents a feasible approach of simulating quantum circuits using much fewer qubits, while achieving a much higher circuit fidelity.

http://resolver.tudelft.nl/uuid:a43169e9-a401-4245-96f2-7de5eeac6ce8

https://doi.org/10.1103/PhysRevLett.130.110601

0031-9007

Physical Review Letters, 130 (11)

Institutional Repository

journal article

© 2023 Chong Ying, Bin Cheng, Youwei Zhao, He Liang Huang, Y.N. Zhang, Ming Gong, Yulin Wu, S. Wang, Futian Liang, More Authors