Quantum state space is endowed with a metric structure, and Riemannian monotone metric is an important geometric entity defined on such a metric space. Riemannian monotone metrics are very useful for information-theoretic and statistical considerations on the quantum state space. In this article, considering the quantum state space being spanned by $$2\times 2$$ 2 × 2 density matrices, we determine a particular Riemannian metric for a state $$\rho $$ ρ and show that if $$\rho $$ ρ gets entangled with another quantum state, the negativity of the generated entangled state is, upto a constant factor, equal to square root of that particular Riemannian metric . Our result clearly relates a geometric quantity to a measure of entanglement. Moreover, the result establishes the possibility of understanding quantum correlations through geometric approach.
Quantum Information Processing – Springer Journals
Published: Jan 12, 2016
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