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

Ryoji Miyazaki; Tsuyoshi Yamamoto

doi:10.1103/PhysRevA.111.062612

← Back to search

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

Ryoji Miyazaki, Tsuyoshi Yamamoto

DOI 10.1103/PhysRevA.111.062612 · Physical Review A

T1

Active bibliographic source — not scientific approval

Bibliographic access preserves source history; it does not approve extracted materials or validate reported claims. Review warnings on each occurrence separately.

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.