New techniques for accuratemeasurements of tiny quantumobjects ANUmedia NaturePhysics
Our final experiment compares the performance of different platforms for estimating qubit rotations. This provides an indication of what resources may be used in a future quantum metrology network. For superconducting devices, we first perform simultaneous qubit rotation estimation using all non-neighbouring qubits, to minimize cross-talk between qubits. The mean m.s.e. and minimum m.s.e. across all qubits is shown in Fig.= −0.01 to 0.01, repeated 120 times for each angle.
In all but four cases error mitigation is beneficial. The data incorrespond to the average of 400 individual experimental runs, each using 512 shots. For all figures, error bars correspond to one standard deviation obtained by bootstrapping. The different IBM Q processors tested are Belem , Bogota , Casablanca , Guadalupe , Jakarta , Lima , Manhattan , Quito , Santiago , Toronto , Yorktown and the F-IBM QS1 device .
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