V-shaped superconducting artificial atom based on two inductively coupled transmons

É. Dumur; B. Küng; A. K. Feofanov; T. Weissl; N. Roch; C. Naud; W. Guichard; O. Buisson

doi:10.1103/PhysRevB.92.020515

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V-shaped superconducting artificial atom based on two inductively coupled transmons

É. Dumur, B. Küng, A. K. Feofanov, T. Weissl, N. Roch, C. Naud, W. Guichard, O. Buisson

DOI 10.1103/PhysRevB.92.020515 · Physical Review B

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Abstract

Circuit quantum electrodynamics systems are typically built from resonators and two-level artificial atoms, but the use of multilevel artificial atoms instead can enable promising applications in quantum technology. Here we present an implementation of a Josephson junction circuit dedicated to operate as a V-shape artificial atom. Based on a concept of two internal degrees of freedom, the device consists of two transmon qubits coupled by an inductance. The Josephson nonlinearity introduces a strong diagonal coupling between the two degrees of freedom that finds applications in quantum nondemolition readout schemes, and in the realization of microwave cross-Kerr media based on superconducting circuits.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
Al Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown