Protocol for temperature sensing using a three-level transmon circuit

Aidar Sultanov, Marko Kuzmanović, Andrey V. Lebedev, Gheorghe Sorin Paraoanu*

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

Abstract

We present a method for in situ temperature measurement of superconducting quantum circuits, by using the first three levels of a transmon device to which we apply a sequence of π gates. Our approach employs projective dispersive readout and utilizes the basic properties of the density matrix associated with thermal states. This method works with an averaging readout scheme and does not require a single-shot readout setup. We validate this protocol by performing thermometry in the range of 50-200 mK, corresponding to a range of residual populations 1%-20% for the first excited state and 0.02%-3% for the second excited state.

Original languageEnglish
Article number144002
JournalApplied Physics Letters
Volume119
Issue number14
DOIs
Publication statusPublished - 4 Oct 2021
MoE publication typeA1 Journal article-refereed

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