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PDF (double-sided) - Physics Department, UCSB - University of ...

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equires to converge. Since the algorithm has much less built-in “smart” decision<br />

making, it needs to draw its information from more data. But due to its<br />

pipelineability and thus higher duty cycle, it does not run for much longer than<br />

the Nelder-Mead Simplex algorithm before it converges.<br />

11.4 Experimental Results<br />

Even though the main result <strong>of</strong> the experiment consists <strong>of</strong> only the obtained<br />

S-value together with its standard deviation, this number needs to be supplemented<br />

with several datasets that test the experiment for flaws. The most useful<br />

<strong>of</strong> this additional information are the parameters <strong>of</strong> the sequence found by the optimization,<br />

since angles that match the theoretically expected values are a strong<br />

indication that the implementation can be trusted. To claim a reliable violation,<br />

the dataset should further address all known mechanism for the introduction <strong>of</strong><br />

artificial correlations during the time <strong>of</strong> measurement, e.g. microwave and measurement<br />

crosstalk. Additional checks that show the variation <strong>of</strong> S as a function<br />

<strong>of</strong> certain parameters can be <strong>of</strong> assistance in debugging the experiment, but are<br />

<strong>of</strong> lesser importance for proving its correctness due to the robustness <strong>of</strong> the inequality.<br />

Finally, to explain the obtained S-value, the performance parameters <strong>of</strong><br />

the involved qubits (and resonator), like T 1 and T 2 , can be used in a simulation<br />

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