Monday, July 1, 2013

1306.6873 (Gian Luca Giorgi)

Is quantum discord a useful resource for remote state preparation?    [PDF]

Gian Luca Giorgi
The role played by quantum discord in mixed-state computation is widely debated since, in spite of the presence of evidences of its importance in creating quantum advantages, even in the absence of entanglement, there are not direct proofs of its necessity in these computational tasks. Recently the presence of discord was shown to be necessary and sufficient for remote state preparation for a broad class of quantum channels [B. Daki\'c et al., Nat. Phys. 8, 666 (2012)]. Here, we show that this property is not universal. There are states whose discord cannot be considered as a quantum resource, since it has been produced locally, that are useful for remote state preparation, and there are bona fide discordant states that are of no help.
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