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

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 $0.5K$. 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.

13 pages, 12 figures