Private Quantum Coding for Quantum Relay Networks

@inproceedings{Gyongyosi2012PrivateQC,
  title={Private Quantum Coding for Quantum Relay Networks},
  author={Laszlo Gyongyosi and S{\'a}ndor Imre},
  booktitle={EUNICE},
  year={2012}
}
The relay encoder is an unreliable probabilistic device which is aimed at helping the communication between the sender and the receiver. In this work we show that in the quantum setting the probabilistic behavior can be completely eliminated. We also show how to combine quantum polar encoding with superactivation-assistance in order to achieve reliable and capacity-achieving private communication over noisy quantum relay channels. 

Quantum Broadcast Channels with Cooperating Decoders: An Information-Theoretic Perspective on Quantum Repeaters

TLDR
It is shown that as opposed to the MAC with entangled encoders, entanglement between decoders does not increase the classical communication rates for the broadcast dual.

Polaractivation of hidden private classical capacity region of quantum channels

  • L. Gyongyosi
  • Computer Science
    2013 IEEE Symposium on Swarm Intelligence (SIS)
  • 2013
TLDR
With the help of the proposed polaractivation scheme private classical information can be transmitted over a quantum channel that initially was not capable of private communication and the method works for arbitrary quantum channels for which a given criteria in the symmetric classical capacity is satisfied.

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