ePrints@IIScePrints@IISc Home | About | Browse | Latest Additions | Advanced Search | Contact | Help

Characterizing decoherence rates of a superconducting qubit by direct microwave scattering

Lu, Y and Bengtsson, A and Burnett, JJ and Wiegand, E and Suri, B and Krantz, P and Roudsari, AF and Kockum, AF and Gasparinetti, S and Johansson, G and Delsing, P (2021) Characterizing decoherence rates of a superconducting qubit by direct microwave scattering. In: npj Quantum Information, 7 (1).

npj_qua_inf_7-1_2021.pdf - Published Version

Download (2MB) | Preview
41534_2021_367_MOESM1_ESM.pdf - Published Supplemental Material

Download (232kB) | Preview
Official URL: https://dx.doi.org/10.1038/s41534-021-00367-5


We experimentally investigate a superconducting qubit coupled to the end of an open transmission line, in a regime where the qubit decay rates to the transmission line and to its own environment are comparable. We perform measurements of coherent and incoherent scattering, on- and off-resonant fluorescence, and time-resolved dynamics to determine the decay and decoherence rates of the qubit. In particular, these measurements let us discriminate between non-radiative decay and pure dephasing. We combine and contrast results across all methods and find consistent values for the extracted rates. The results show that the pure dephasing rate is one order of magnitude smaller than the non-radiative decay rate for our qubit. Our results indicate a pathway to benchmark decoherence rates of superconducting qubits in a resonator-free setting. © 2021, The Author(s).

Item Type: Journal Article
Publication: npj Quantum Information
Publisher: Nature Research
Additional Information: The copyright of this article belongs to Nature Research
Keywords: Coherent scattering; Electric lines; Incoherent scattering; Quantum theory; Superconducting resonators; Transmissions, Consistent values; Decoherence rates; Measurements of; Microwave scattering; Nonradiative decays; Pure-dephasing; Superconducting qubits; Time-resolved dynamics, Qubits
Department/Centre: Division of Physical & Mathematical Sciences > Instrumentation Appiled Physics
Date Deposited: 11 Mar 2021 09:07
Last Modified: 11 Mar 2021 09:07
URI: http://eprints.iisc.ac.in/id/eprint/68169

Actions (login required)

View Item View Item