| Title: |
Physics-informed tracking of qubit fluctuations |
| Authors: |
Berritta, F; Krzywda, JA; Benestad, J; van der Heijden, J; Fedele, F; Fallahi, S; Gardner, GC; Manfra, MJ; van Nieuwenburg, E; Danon, J; Chatterjee, A; Kuemmeth, F |
| Publisher Information: |
American Physical Society |
| Publication Year: |
2025 |
| Collection: |
Oxford University Research Archive (ORA) |
| Description: |
Environmental fluctuations degrade the performance of solid-state qubits but can in principle be mitigated by real-time Hamiltonian estimation down to timescales set by the estimation efficiency. We implement a physics-informed and an adaptive Bayesian estimation strategy and apply them in real time to a semiconductor spin qubit. The physics-informed strategy propagates a probability distribution inside the quantum controller according to the Fokker-Planck equation, appropriate for describing the effects of nuclear spin diffusion in gallium arsenide. Evaluating and narrowing the anticipated distribution by a predetermined qubit probe sequence enables improved dynamical tracking of the uncontrolled magnetic field gradient within the singlet-triplet qubit. The adaptive strategy replaces the probe sequence by a small number of qubit probe cycles, with each probe time conditioned on the previous measurement outcomes, thereby further increasing the estimation efficiency. The combined real-time estimation strategy efficiently tracks low-frequency nuclear spin fluctuations in solid-state qubits, and can be applied to other qubit platforms by tailoring the appropriate update equation to capture their distinct noise sources. |
| Document Type: |
article in journal/newspaper |
| Language: |
English |
| Relation: |
https://doi.org/10.1103/physrevapplied.22.014033 |
| DOI: |
10.1103/physrevapplied.22.014033 |
| Availability: |
https://doi.org/10.1103/physrevapplied.22.014033; https://ora.ox.ac.uk/objects/uuid:17cd2abe-7732-4c03-ad4a-eb34fcdd20e5 |
| Rights: |
info:eu-repo/semantics/openAccess ; CC Attribution (CC BY) |
| Accession Number: |
edsbas.50A5BA76 |
| Database: |
BASE |