Protocol for temperature sensing using a three-level transmon circuit

被引：10

作者：

Sultanov, Aidar ^{[1
]}

Kuzmanovic, Marko ^{[1
]}

Lebedev, Andrey V. ^{[2
,3
]}

Paraoanu, Gheorghe Sorin ^{[1
]}

机构：

[1] Aalto Univ, Sch Sci, QTF Ctr Excellence, Dept Appl Phys, FI-00076 Aalto, Finland

[2] Dukhov Res Inst Automat VNIIA, Moscow 127055, Russia

[3] Moscow Inst Phys & Technol, Inst Per 9, Moscow 141700, Russia

来源：

APPLIED PHYSICS LETTERS | 2021年 / 119卷 / 14期

基金：

芬兰科学院;

关键词：

QUANTUM ERROR-CORRECTION;

D O I：

10.1063/5.0065224

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

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 pi 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.

引用

页数：6

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