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.
A Superconducting Qubit Network as a Sensitive Microwave Photon Detector
Ruggiero, Berardo;Silvestrini, Paolo;
2025
Abstract
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.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
