Four-body coupler for superconducting qubits based on Josephson parametric oscillators

• URL: http://arxiv.org/abs/2501.03578v2
• Date: Wed, 23 Apr 2025 05:42:16 GMT
• Title: Four-body coupler for superconducting qubits based on Josephson parametric oscillators
• Authors: Ryoji Miyazaki, Tsuyoshi Yamamoto,
• Abstract summary: We propose a circuit of the four-body coupler for superconducting qubits based on Josephson parametric oscillators (JPOs)<n>Our coupler for the four-body interaction has a superconducting loop, similar to a capacitively shunted flux qubit, where an external magnetic flux set to half a flux quantum is threaded.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: We theoretically propose a circuit of the four-body coupler for superconducting qubits based on Josephson parametric oscillators (JPOs). Our coupler for the four-body interaction has a superconducting loop, similar to a capacitively shunted flux qubit, where an external magnetic flux set to half a flux quantum is threaded. This coupler circuit is a specific setup of the circuit called superconducting nonlinear asymmetric inductive elements (SNAIL) and also is a generalization of the previously proposed one for the four-body interaction of JPOs. We clarify roles of circuit parameters in the four-body interaction and, in particular, show that the four-body coupling constant in our circuit can be significantly increased by tuning capacitance of the coupler or the area ratio of the Josephson junctions of the coupler.

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