Polarimetry with Spins in the Solid State

The ability for optically active media to rotate the polarization of light is the basis of polarimetry, a prominent technique responsible for many breakthroughs in fields as varied as astronomy, medicine, and material science. Here, we recast the primary mechanism for spin readout in semiconductor-based quantum computers, Pauli spin-blockade (PSB), as the natural extension of polarimetry to the third dimension. We perform polarimetry with spins through a silicon quantum dot exchanging a hole with a boron acceptor, demonstrating the role of spin-orbit coupling in creating spin misalignment. Perfect spin alignment may be recovered by means of rotating the applied magnetic-field orientation. This work shows how spin misalignment sets a fundamental upper limit for the spin readout fidelity in quantum-computing systems based on PSB.

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Institutions

Publication Details

Journal
Nano Letters
Published
2025-05-07
DOI
https://doi.org/10.1021/acs.nanolett.5c01511
Citations
2
Primary Topic
Quantum Information and Cryptography
Type
article
Field-Weighted Citation Impact
4.96

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article

Polarimetry with Spins in the Solid State

Lorenzo Peri, M. Fernando González-Zalba, Sylvain Barraud, C. J. B. Ford et al.
2 citations
Nano Letters
Quantum Information and Cryptography
4.96
article

Polarimetry with Spins in the Solid State

Lorenzo Peri, M. Fernando González-Zalba, Sylvain Barraud, C. J. B. Ford, Felix-Ekkehard von Horstig, Mónica Benito
article en
2 citations

Abstract

The ability for optically active media to rotate the polarization of light is the basis of polarimetry, a prominent technique responsible for many breakthroughs in fields as varied as astronomy, medicine, and material science. Here, we recast the primary mechanism for spin readout in semiconductor-based quantum computers, Pauli spin-blockade (PSB), as the natural extension of polarimetry to the third dimension. We perform polarimetry with spins through a silicon quantum dot exchanging a hole with a boron acceptor, demonstrating the role of spin-orbit coupling in creating spin misalignment. Perfect spin alignment may be recovered by means of rotating the applied magnetic-field orientation. This work shows how spin misalignment sets a fundamental upper limit for the spin readout fidelity in quantum-computing systems based on PSB.

Nano LettersVol. 25(23)
Institut polytechnique de Grenoble (FR), Ikerbasque (ES), University of Augsburg (DE), University of Cambridge (GB), Commissariat à l'Énergie Atomique et aux Énergies Alternatives (FR), CEA Grenoble (FR), Quantum Motion Technologies (United Kingdom) (GB), CIC nanoGUNE (ES), Laboratoire d'Électronique des Technologies de l'Information (FR), Université Grenoble Alpes (FR)
Gates Cambridge Trust, Horizon 2020 Framework Programme, Medical Research Council, Engineering and Physical Sciences Research Council
Openalex Percentile: Top 5%
Quantum Information and Cryptography
4.96
DOIOpen Access PDFOpenAlex
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Polarimetry with Spins in the Solid State — Lorenzo Peri, M. Fernando González-Zalba, et al. · Nano Letters (2025) | TGRS Research Map | TGRS