Dissimilar notions of quantum correlations have been established, each being motivated through particular applications in information science and competing for recognized as the most relevant measure quantumness. In this contribution, we experimentally realize a form correlation that exists even absence entanglement discord. We certify presence such via negativities regularized two-mode Glauber...

In the present work, we consider a scenario where an arbitrary two-qubit pure state is applied for the quantum key generation (QKG). Using the twirling procedure to convert the pure state into a Werner state, the error rate of the key can be reduced by a factor of 2/3. This effect indicates that entanglement is not the sufficient resource of QKG protocol since it is not increased in the twirlin...