Optimal entangling measurements on two qubits violate the three-parameter precision trade-off bound by an average of 16 standard deviations, achieving tomography precision unreachable by individual measurements.
Heisenberg, ¨Uber den anschaulichen Inhalt der quan- tentheoretischen Kinematik und Mechanik, Zeitschrift f¨ ur Physik43, 172 (1927)
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Beating three-parameter precision trade-offs with entangling collective measurements
Optimal entangling measurements on two qubits violate the three-parameter precision trade-off bound by an average of 16 standard deviations, achieving tomography precision unreachable by individual measurements.