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.
Schr¨ odinger, Zum heisenbergschen unsch¨ arfeprinzip, Sitzungsberichte der Preussischen Akademie der Wis- senschaften, Physikalisch-mathematische Klasse14, 296 (1930)
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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.