A new uncertainty relation supplements the Robertson-Schrödinger lower bound with a noncommutativity-induced positive term given by the expectation value of the squared commutator modulus, becoming equality for qubits.
Uncertainty relations for noise and disturbance in generalized quan- tum measurements.Annals of Physics, 311(2):350–416, 2004
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Beyond Robertson-Schr\"odinger: A General Uncertainty Relation Unveiling Hidden Noncommutative Trade-offs
A new uncertainty relation supplements the Robertson-Schrödinger lower bound with a noncommutativity-induced positive term given by the expectation value of the squared commutator modulus, becoming equality for qubits.