Enhancing entanglement and total correlations dynamics via local
  unitaries
The interaction with the environment is one of the main obstacles to be
circumvented in practical implementations of quantum information tasks. The use
of local unitaries, while not changing the initial entanglement present in a
given state, can enormously change its dynamics through a noisy channel, and
consequently its ability to be used as a resource. This way, local unitaries
provide an easy and accessible way to enhance quantum correlations in a variety
of different experimental platforms. Given an initial entangled state and a
certain noisy channel, what are the local unitaries providing the most robust
dynamics? In this paper we solve this question considering two qubits states,
together with paradigmatic and relevant noisy channels, showing its
consequences for teleportation protocols and identifying cases where the most
robust states are not necessarily the ones imprinting the least information
about themselves into the environment. We also derive a general law relating
the interplay between the total correlations in the system and environment with
their mutual information built up over the noisy dynamics. Finally, we employ
the IBM Quantum Experience to provide a proof-of-principle experimental
implementation of our results.
Joab Morais Varela Ranieri Nery George Moreno Alice Caroline de Oliveira Viana Gabriel Landi Rafael Chaves