Variance-based uncertainty relation for incompatible observers
arXiv:1705.07396
Abstract
Based on mixedness definition as M=1-tr(\r{ho}^2), we obtain a new variance-based uncertainty equality along with an inequality for Hermitian operators of a single-qubit system. The obtained uncertainty equality can be used as a measure of the system mixedness. A qubit system with feedback control is also exploited to demonstrate the new uncertainty.
arXiv comment10 pages;3 figures, in press in Quantum Inf Process
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