Fingerprints of Qubit Noise in Transient Cavity Transmission

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Physical review letters. American Physical Society (APS). 2022, 128(23), 236801. ISSN 0031-9007. eISSN 1079-7114. Available under: doi: 10.1103/PhysRevLett.128.236801
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Noise affects the coherence of qubits and thereby places a bound on the performance of quantum computers. We theoretically study a generic two-level system with fluctuating control parameters in a photonic cavity and find that basic features of the noise spectral density are imprinted in the transient transmission through the cavity. We obtain analytical expressions for generic noise and proceed to study the cases of quasistatic, white and 1/f^{α} noise in more detail. Additionally, we propose a way of extracting the noise power spectral density in a frequency band only bounded by the range of the qubit-cavity detuning and with an exponentially decaying error due to finite measurement times. Our results suggest that measurements of the time-dependent transmission probability represent a novel way of extracting noise characteristics.

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ISO 690MUTTER, Philipp M., Guido BURKARD, 2022. Fingerprints of Qubit Noise in Transient Cavity Transmission. In: Physical review letters. American Physical Society (APS). 2022, 128(23), 236801. ISSN 0031-9007. eISSN 1079-7114. Available under: doi: 10.1103/PhysRevLett.128.236801
BibTex
@article{Mutter2022-06-10Finge-58298,
  year={2022},
  doi={10.1103/PhysRevLett.128.236801},
  title={Fingerprints of Qubit Noise in Transient Cavity Transmission},
  number={23},
  volume={128},
  issn={0031-9007},
  journal={Physical review letters},
  author={Mutter, Philipp M. and Burkard, Guido},
  note={Article Number: 236801}
}
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