Quantum Cloning, Bell's Inequality and Teleportation

TL;DR

This paper investigates the use of output states from the Buzek-Hillery quantum cloning machine as teleportation channels, analyzing their entanglement, Bell inequality violation, and suitability for teleportation.

Contribution

It identifies parameter ranges where the cloning machine's output states are entangled, violate Bell inequalities, and can be effectively used for quantum teleportation.

Findings

Output states can be entangled without Bell violation.

Certain parameters yield states suitable for teleportation.

Cloning machine output enhances teleportation applications.

Abstract

We analyze a possibility of using the two qubit output state from Buzek-Hillery quantum copying machine (not necessarily universal quantum cloning machine) as a teleportation channel. We show that there is a range of values of the machine parameter $\xi$ for which the two qubit output state is entangled and violates Bell-CHSH inequality and for a different range it remains entangled but does not violate Bell-CHSH inequality. Further we observe that for certain values of the machine parameter the two-qubit mixed state can be used as a teleportation channel. The use of the output state from the Buzek-Hillery cloning machine as a teleportation channel provides an additional appeal to the cloning machine and motivation of our present work.