Quantum discord as resource for remote state preparation

Understand

Quantum entanglement is widely recognized as one of the key resources for the advantages of quantum information processing, including universal quantum computation, reduction of communication complexity or secret key distribution.

• However, computational models have been discovered, which consume very little or no entanglement and still can efficiently solve certain problems thought to be classically intractable.
• The existence of these models suggests that separable or weakly entangled states could be extremely useful tools for quantum information processing as they are much easier to prepare and control even in dissipative environments.
• It has been proposed that a requirement for useful quantum states is the generation of so-called quantum discord, a measure of non-classical correlations that includes entanglement as a subset.