Distributing quantum correlations through local operations and classical resources

Adam G Hawkins*, Hannah McAleese, Mauro Paternostro

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

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Abstract

Distributing quantum correlations to each node of a network is a key aspect of quantum networking. Here, we present a robust, physically motivated protocol by which global quantum correlations, as characterized by the discord, can be distributed to quantum memories using a mixed state of information carriers which possesses only classical correlations. In addition, such distribution is done using only bilocal unitary operations and projective measurements, with the degree of discord being measurement-outcome independent. We explore the scaling of the performance of the proposed protocol with the size of the network and illustrate the structure of quantum correlations that are shared by the nodes, showing its dependence on the local operations performed. Finally, we find the counterintuitive result that even more discord can be generated when the resource state undergoes correlated dephasing noise, allowing high fidelities with mixtures of the Bell basis such as Werner states.
Original languageEnglish
Article number 025007
Number of pages15
JournalQuantum Science and Technology
Volume10
Issue number2
Early online date27 Jan 2025
DOIs
Publication statusEarly online date - 27 Jan 2025

Keywords

  • quantum dissonance
  • quantum correlations
  • quantum networks
  • quantum communication
  • quantum discord
  • quantum channels
  • quantum protocols

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