Quantum Trajectory Analysis of Single Microwave Photon Detection by Nanocalorimetry

Bayan Karimi*, Jukka P. Pekola

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

15 Citations (Scopus)
170 Downloads (Pure)


We apply quantum trajectory techniques to analyze a realistic setup of a superconducting qubit coupled to a heat bath formed by a resistor, a system that yields explicit expressions of the relevant transition rates to be used in the analysis. We discuss the main characteristics of the jump trajectories and relate them to the expected outcomes ("clicks") of a fluorescence measurement using the resistor as a nanocalorimeter. As the main practical outcome, we present a model that predicts the time-domain response of a realistic calorimeter subject to single microwave photons, incorporating the intrinsic noise due to the fundamental thermal fluctuations of the absorber and finite bandwidth of a thermometer.

Original languageEnglish
Article number170601
Number of pages5
JournalPhysical Review Letters
Issue number17
Publication statusPublished - 1 May 2020
MoE publication typeA1 Journal article-refereed


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