Quantum design for advanced qubits: plasmonium
Abstract
The increasingly complex quantum electronic circuits with a number of coupled quantum degrees of freedom will become intractable to be simulated on classical computers, and requires quantum computers for an efficient simulation. In turn, it will be a central concept in quantum-aided design for next-generation quantum processors. Here, we demonstrate variational quantum eigensolvers to simulate superconducting quantum circuits with varying parameters covering a plasmon-transition regime, which reveals an advanced post-transmon qubit, "plasmonium". We fabricate this new qubit and demonstrate that it exhibits not only high single- and two-qubit gate fidelities (99.85(1)% and 99.58(3)%, respectively), but also a shrinking (by 60%) physical size and larger (by 50%) anharmonicity than the transmon, which can bring a number of advantages for scaling up multi-qubit devices. Our work opens the way to designing advanced quantum processors using existing quantum computing resources.
Cite
@article{arxiv.2109.00994,
title = {Quantum design for advanced qubits: plasmonium},
author = {Feng-Ming Liu and Ming-Cheng Chen and Can Wang and Shao-Wei Li and Zhong-Xia Shang and Chong Ying and Jian-Wen Wang and Cheng-Zhi Peng and Xiaobo Zhu and Chao-Yang Lu and Jian-Wei Pan},
journal= {arXiv preprint arXiv:2109.00994},
year = {2022}
}
Comments
We demonstrate quantum computer-aided design of a new high-performance superconducting quantum processor