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Quantum Computing

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  • $\begingroup$ Do I understand correctly that this is because my observable is purely spacelike? Therefore, would even a single round of syndrome extraction be enough? $\endgroup$ Commented Sep 2 at 12:23
  • $\begingroup$ Yes correct. Yes $\endgroup$ Commented Sep 2 at 12:55
  • $\begingroup$ Thanks a lot! But then, how would I design a simple experiment to test the more complicated case where I actually need d rounds? Do I need a lattice surgery experiment (or alternatively, moving a patch), or is there a simple way to test it? $\endgroup$ Commented Sep 4 at 8:11
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    $\begingroup$ Giving the answer myself: One must do a stability experiment instead of a memory experiment. $\endgroup$ Commented Sep 4 at 9:00
  • $\begingroup$ @distort8364 Right. You can also get timelike errors in surface code Y basis memory experiments, if you accidentally mirror the topological preparation vs the topological measurement (see figure 16 and figure 14 of arxiv.org/abs/2302.07395 ). $\endgroup$ Commented Sep 4 at 15:40