1NEST Istituto Nanoscienze-CNR and Scuola Normale Superiore, I-56127 Pisa, Italy
2CNR-Spin, Via Dodecaneso 33, I-16146 Genova
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Abstract
The quasicharge superconducting qubit realizes the dual of the transmon and shows strong robustness to flux and charge fluctuations thanks to a very large inductance closed on a Josephson junction. At the same time, a weak anharmonicity of the spectrum is inherited from the parent transmon, that introduces leakage errors and is prone to frequency crowding in multi-qubit setups. We propose a novel design that employs a quartic superinductor and confers a good degree of anharmonicity to the spectrum. The quartic regime is achieved through a properly designed chain of Josephson junction loops that shows minimal quantum fluctuations without introducing a severe dependence on the external fluxes.
Featured image: The device is constituted by a Josephson junction shunted by a capacitance and closed on a chain of $N$ loops, each constituted by a series of $M$ Josephson junctions closed on a smaller one. The wave function of the two lowest energy states have a large spread and are insensitive to weak displacements. The spectrum shows unequally spaced transitions.
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Cited by
[1] Sasu Tuohino, Vasilii Vadimov, Wallace S. Teixeira, Tommi Malmelin, Matti Silveri, and Mikko Möttönen, “Multimode physics of the unimon circuit”, arXiv:2309.09732, (2023).
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