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In this work we report on a two-tone spectroscopy experiment performed on a superconducting qubit network (SQN) composed of ten flux qubits coupled to low-dissipative microwave resonators. Non-linear effects such as the shift of the absorption peak both by power and by frequency of the pump second tone signal were observed, due to the multiphoton interaction between pump microwave signal and the SQN. We experimentally demonstrated that SQN detector with collective quantum state permits to detect low power microwave signals with a frequency of 7.748 GHz in the range between –110 and –75 dBm, which is lower than the microwave power range of conventional Schottky detector.

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A Superconducting Qubit Network as a Sensitive Microwave Photon Detector

  • 会议论文

  • 发表日期：

    2026年

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  • Valentina Di Meo,
  • Giorgio Brida,
  • Fabio Chiarello,
  • Alessandro D’Elia,
  • Emanuele Enrico,
  • Ilya Eremin,
  • Luca Fasolo,
  • Mikhail Fistul,
  • Claudio Gatti,
  • Patrick Navez,
  • Alessio Rettaroli,
  • Berardo Ruggiero,
  • Paolo Silvestrini,
  • Paolo Vanacore,
  • Alexandre Zagoskin,
  • Mikhail Lisitskiy

摘要

In this work we report on a two-tone spectroscopy experiment performed on a superconducting qubit network (SQN) composed of ten flux qubits coupled to low-dissipative microwave resonators. Non-linear effects such as the shift of the absorption peak both by power and by frequency of the pump second tone signal were observed, due to the multiphoton interaction between pump microwave signal and the SQN. We experimentally demonstrated that SQN detector with collective quantum state permits to detect low power microwave signals with a frequency of 7.748 GHz in the range between –110 and –75 dBm, which is lower than the microwave power range of conventional Schottky detector.