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TT: Fachverband Tiefe Temperaturen

TT 31: Superconducting Electronics: SQUIDs, Qubits, Circuit QED, Quantum Coherence and Quantum Information Systems 1

TT 31.7: Vortrag

Mittwoch, 18. März 2020, 11:00–11:15, HSZ 03

Study of the relaxation and decoherence in 2D fluxoniums — •Farshad Foroughi, Karthik Bharadwaj, Luca Planat, Arpit Ranadive, Cecile Naud, Olivier Buisson, Nicolas Roch, and Wiebke Hasch-Guichard — univ. Grenoble Alpes, CNRS, Grenoble INP, Institut Néel, 38000 Grenoble, France

High anharmonicity and wide frequency tunability of the Fluxonium qubit make it an indispensable candidate for emerging quantum computers. Moreover fluxonium qubit in a 3D cavity or environment, when biased at sweet spot, shows very high relaxation time at the order of 10 ms[1]. However 2D and on-chip qubits are more favorable to scale up. The transition from 3D to 2D is not trivial as the coupling to the unwanted degrees of freedom increases a lot. In this work we coupled the fluxonium qubit to on-chip lumped element and distributed resonators. We have studied effect of different qubit parameters on the coherence times T1 and T2.

[1] I. M. Pop et al., Nature 508, 369-372 (2014)