Scientists have made a breakthrough in understanding quantum cloning, a process that, while impossible to do perfectly, can be approximated to replicate quantum states. This research, focusing on the output states of quantum cloning machines, explores how these states can be used in quantum teleportation and how they relate to the violation of Bell-CHSH inequalities, which challenge classical realism. The findings offer new perspectives on quantum information processing.
The study, which examines the nonlocality characteristics of cloned output states, reveals that certain parameter settings allow these states to act as effective quantum channels for teleportation. This means that even though perfect cloning is impossible, the approximate copies created by these machines can still be used to transfer quantum information. This discovery is a step forward in quantum communication.
Researchers found that some cloned states that do not violate Bell-CHSH inequalities can still be used for nonclassical teleportation. This highlights a key difference between Bell nonlocality and the usefulness of teleportation. The work also quantitatively characterizes the monogamy relations governing Bell-CHSH violations in quantum cloning states, revealing fundamental constraints on nonlocality distribution in cloned quantum systems.