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When Does Noise Increase the Quantum Capacity?

Brandão, Fernando G. S. L. and Oppenheim, Jonathan and Strelchuk, Sergii (2012) When Does Noise Increase the Quantum Capacity? Physical Review Letters, 108 (4). Art. No. 040501. ISSN 0031-9007. doi:10.1103/PhysRevLett.108.040501.

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Superactivation is the property that two channels with zero quantum capacity can be used together to yield a positive capacity. Here we demonstrate that this effect exists for a wide class of inequivalent channels, none of which can simulate each other. We also consider the case where one of two zero-capacity channels is applied, but the sender is ignorant of which one is applied. We find examples where the greater the entropy of mixing of the channels, the greater the lower bound for the capacity. Finally, we show that the effect of superactivation is rather generic by providing an example of superactivation using the depolarizing channel.

Item Type:Article
Related URLs:
URLURL TypeDescription Material
Brandão, Fernando G. S. L.0000-0003-3866-9378
Oppenheim, Jonathan0000-0002-8993-412X
Additional Information:© 2012 American Physical Society. (Received 31 July 2011; published 25 January 2012)
Issue or Number:4
Classification Code:PACS numbers: 03.67.Hk, 05.40.Ca
Record Number:CaltechAUTHORS:20160607-103621898
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Official Citation:When Does Noise Increase the Quantum Capacity? Fernando G. S. L. Brandão, Jonathan Oppenheim, and Sergii Strelchuk Phys. Rev. Lett. 108, 040501
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:67721
Deposited By: George Porter
Deposited On:07 Jun 2016 18:07
Last Modified:11 Nov 2021 03:53

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