Broadcasting of entanglement and universal quantum cloners

Abstract

We study broadcasting of entanglement where we use universal quantum cloners (in general less optimal) to perform local cloning operations. We show that there is a lower bound on the fidelity of the universal quantum cloners that can be used for broadcasting. We prove that an entanglement is optimally broadcast only when optimal quantum cloners are used for local copying. We also show that broadcasting of entanglement into more than two entangled pairs is forbidden using only local operations.

8 pages, Latex,final version, to appear in Physical Review A

References in corpus (4)

• Optimal Quantum Cloning Machines
• Optimal Universal and State-Dependent Quantum Cloning
• Optimal Cloning of Pure States
• Broadcasting of entanglement via local copying

Cited by in corpus (15)

• Asymmetric quantum telecloning of d-level systems and broadcasting of entanglement to different locations using the "many-to-many" communication protocol
• Broadcasting of continuous variable entanglement
• Broadcasting of three qubit entanglement via local copying and entanglement swapping
• Broadcasting of Quantum Correlations: Possibilities & Impossibilities
• Broadcasting of Inseparability
• Asymmetric broadcasting of quantum correlations
• Optimal Universal Disentangling Machine for Two Qubit Quantum States
• Broadcasting of quantum correlations in qubit-qudit systems
• Broadcasting of correlations via orthogonal & non-orthogonal state dependent cloners
• Universal covariant quantum cloning circuits for qubit entanglement manipulation
• Temperature effects on quantum cloning of states and entanglement
• Reliable entanglement transfer between pure quantum states
• Two-qubit universal and state-dependent quantum cloning machine and quantum correlation broadcasting
• Broadcasting of NPT Entanglement in Two Qutrit Systems
• Broadcasting of non-locality