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.
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A quantum speed limit for observables is formulated from the trace-norm asymmetry of the time-dependent state, observable through weak measurements and bounding the quantum Fisher information for the conjugate parameter.
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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.
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Quantum speed limit for observables from quantum asymmetry
A quantum speed limit for observables is formulated from the trace-norm asymmetry of the time-dependent state, observable through weak measurements and bounding the quantum Fisher information for the conjugate parameter.