High-contrast ZZ interaction using superconducting qubits with opposite-sign anharmonicity

• URL: http://arxiv.org/abs/2002.07560v4
• Date: Sat, 27 Mar 2021 18:54:06 GMT
• Title: High-contrast ZZ interaction using superconducting qubits with opposite-sign anharmonicity
• Authors: Peng Zhao, Peng Xu, Dong Lan, Ji Chu, Xinsheng Tan, Haifeng Yu, and Yang Yu
• Abstract summary: We introduce a superconducting architecture using qubits with opposite-sign anharmonicity, a transmon qubit and a C-shunt flux qubit. We can control the interaction with a high on/off ratio to implement two-qubit CZ gates, or suppress it during two-qubit gate operation using XY interaction.
• Score: 13.303544353756644
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: For building a scalable quantum processor with superconducting qubits, ZZ interaction is of great concern because its residual has a crucial impact to two-qubit gate fidelity. Two-qubit gates with fidelity meeting the criterion of fault-tolerant quantum computationhave been demonstrated using ZZ interaction. However, as the performance of quantum processors improves, the residual static-ZZ can become a performance-limiting factor for quantum gate operation and quantum error correction. Here, we introduce a superconducting architecture using qubits with opposite-sign anharmonicity, a transmon qubit and a C-shunt flux qubit, to address this issue. We theoretically demonstrate that by coupling the two types of qubits, the high-contrast ZZ interaction can be realized. Thus, we can control the interaction with a high on/off ratio to implement two-qubit CZ gates, or suppress it during two-qubit gate operation using XY interaction (e.g., an iSWAP gate). The proposed architecture can also be scaled up to multi-qubit cases. In a fixed coupled system, ZZ crosstalk related to neighboring spectator qubits could also be heavily suppressed.

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