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QI: Fachverband Quanteninformation
QI 9: Decoherence and Open Systems I
QI 9.6: Vortrag
Dienstag, 10. März 2026, 15:15–15:30, BEY/0245
Signatures of correlated noise in cavity QED — •Nadine Lenke and Guido Burkard — Department of Physics, University of Konstanu, 78457 Konstanz, Germany
Noise effects limit the performance of quantum computation drastically. While the effects of noise are examined in various publications a detailed theoretical description of the influence of noise correlations is missing. In this work we examine the effects of noise correlations in cavity QED. Our underlying system consists of two qubits, which are coupled to the same cavity but not directly to each other. Both qubits are affected by longitudinal noise impacting their energy separation. The effects from noise correlations are indirectly examined with the transmission through the cavity. We compare the influences of white noise and quasi-static noise in the transient regime by applying input-output theory. We find that after averaging over many measurements, the noise correlation spectral density S12(ω) can be extracted from the cavity transmission amplitude A. We compare its dependence on S12(ω) for the two noise models. We conclude that in both cases a higher noise correlation spectral density leads to a decreasing A. In the quasi-static noise case the reduction of the cavity transmission amplitude is weaker. We find that in special parameter settings and for certain initial conditions it is possible to extract the noise correlation spectral density for general types of noise from the second derivative of A with respect to the sensitivities to the noise on the two qubits. The recreation of S12(ω) can be achieved by writing this quantity as a sum of convolutions and by applying the convolution theorem.
Keywords: cavity quantum electrodynamics; spin qubits; white noise; quasi-static noise; noise correlations