Spatial noise correlations beyond nearest neighbors in 28Si/ Si-Ge spin qubits

Spatial noise correlations beyond nearest neighbors in 28Si/ Si-Ge spin qubits

Rojas-Arias, J. S. (RIKEN Center for Emergent Matter Science (CEMS))
Noiri, A. (RIKEN Center for Emergent Matter Science (CEMS))
Stano, P. (RIKEN Center for Emergent Matter Science (CEMS))
Nakajima, T. (RIKEN Center for Emergent Matter Science (CEMS))
Yoneda, J. (Tokyo Institute of Technology)
Takeda, K. (TU Delft Aerospace Engineering; RIKEN Center for Emergent Matter Science (CEMS))
Kobayashi, T. (RIKEN Center for Emergent Matter Science (CEMS))
Sammak, A. (TU Delft BUS/TNO STAFF; TU Delft QuTech Advanced Research Centre)
Scappucci, G. (TU Delft QCD/Scappucci Lab; TU Delft QuTech Advanced Research Centre; Kavli institute of nanoscience Delft)

Aerospace Engineering

2023

We detect correlations in qubit-energy fluctuations of non-neighboring qubits defined in isotopically purified Si/Si-Ge quantum dots. At low frequencies (where the noise is strongest), the correlation coefficient reaches 10% for a next-nearest-neighbor qubit-pair separated by 200 nm. Correlations with the charge-sensor signal reach up to 70%, proving that the observed noise is of electrical origin. A simple theoretical model quantitatively reproduces the measurements and predicts a polynomial decay of correlations with interqubit distance. Our results quantify long-range correlations of noise in quantum-dot spin-qubit arrays, essential for their scalability and fault tolerance.

http://resolver.tudelft.nl/uuid:637a0e78-a4fa-4138-8e91-9323439e5776

https://doi.org/10.1103/PhysRevApplied.20.054024

2331-7019

Physical Review Applied, 20 (5)

Institutional Repository

journal article

© 2023 J. S. Rojas-Arias, A. Noiri, P. Stano, T. Nakajima, J. Yoneda, K. Takeda, T. Kobayashi, A. Sammak, G. Scappucci