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arXiv · 2207.10523

Parity and singlet-triplet high fidelity readout in a silicon double quantum dot at 0.5 K

David J. Niegemann·Victor El-Homsy·Baptiste Jadot·Martin Nurizzo·Bruna Cardoso-Paz·Emmanuel Chanrion·Matthieu Dartiailh·Bernhard Klemt·Vivien Thiney·Christopher Bäuerle·Pierre-André Mortemousque·Benoit Bertrand·Heimanu Niebojewski·Maud Vinet·Franck Balestro·Tristan Meunier·Matias Urdampilleta
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Abstract

We demonstrate singlet-triplet readout and parity readout allowing to distinguish T0 and the polarized triplet states. We achieve high fidelity spin readout with an average fidelity above $99.9\%$ for a readout time of $20~\mu$s and $99\%$ for $4~\mu$s at a temperature of $0.5~K$. We initialize a singlet state in a single dot with a fidelity higher than $99\%$ and separate the two electrons while keeping the same spin state with $a \approx 95.6\%$ fidelity.

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David J. Niegemann, Victor El-Homsy, Baptiste Jadot, Martin Nurizzo, Bruna Cardoso-Paz, Emmanuel Chanrion, Matthieu Dartiailh, Bernhard Klemt, Vivien Thiney, Christopher Bäuerle, Pierre-André Mortemousque, Benoit Bertrand, Heimanu Niebojewski, Maud Vinet, Franck Balestro, Tristan Meunier, Matias Urdampilleta. 2022-07-21. Parity and singlet-triplet high fidelity readout in a silicon double quantum dot at 0.5 K. https://arxiv.org/abs/2207.10523

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