Inferring charge noise source locations from correlations in spin qubits

• URL: http://arxiv.org/abs/2505.05875v1
• Date: Fri, 09 May 2025 08:34:14 GMT
• Title: Inferring charge noise source locations from correlations in spin qubits
• Authors: Juan S. Rojas-Arias, Akito Noiri, Jun Yoneda, Peter Stano, Takashi Nakajima, Kenta Takeda, Takashi Kobayashi, Giordano Scappucci, Seigo Tarucha, Daniel Loss,
• Abstract summary: We investigate low-frequency noise in a spin-qubit device made in isotopically purified Si/Si-Ge.<n>At low frequencies, the noise spectra do not fit well a power law; rather, we can recognize a few individual two-level fluctuators (TLFs)<n>We demonstrate that the noise cross-correlations allow one to get information on the spatial location of such individual TLFs.
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• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: We investigate low-frequency noise in a spin-qubit device made in isotopically purified Si/Si-Ge. Observing sizable cross-correlations among energy fluctuations of different qubits, we conclude that these fluctuations are dominated by charge noise. At low frequencies, the noise spectra do not fit well a power law; rather, we can recognize a few individual two-level fluctuators (TLFs). We demonstrate that the noise cross-correlations allow one to get information on the spatial location of such individual TLFs.

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