University of Konstanz Finds Link Between Noise, Cavity Output

Researchers Nadine Lenke and Guido Burkard from the Department of Physics at the University of Konstanz have devised a method for characterizing noise impacting quantum systems by analyzing the emitted signals from a cavity coupled to two qubits. The work demonstrates that the cavity emission allows for the reconstruction of the noise correlation spectral density, even when the specific type of noise remains unknown, achieved through the application of the convolution theorem. The study finds that noise correlation effects scale with the fifth order of the cavity-qubit coupling constant when dealing with white noise, a stronger suppression than the third-order scaling observed with quasi-static noise. This distinction is crucial, as it highlights how the type of noise dramatically impacts error…