Welcome to the new version of CaltechAUTHORS. Login is currently restricted to library staff. If you notice any issues, please email coda@library.caltech.edu
Published January 27, 2012 | Supplemental Material + Published
Journal Article Open

When Does Noise Increase the Quantum Capacity?

Abstract

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.

Additional Information

© 2012 American Physical Society. (Received 31 July 2011; published 25 January 2012)

Attached Files

Published - PhysRevLett.108.040501.pdf

Supplemental Material - SupplemSect.pdf

Supplemental Material - SupplemSect.tex

Supplemental Material - fig2.pdf

Supplemental Material - fig3.pdf

Files

SupplemSect.pdf
Files (1.7 MB)
Name Size Download all
md5:1ab0e6cf064e9eb8d94307a5a893e21c
578.0 kB Preview Download
md5:1dcbe24a2943867e6dc9e2e1b7e07232
16.8 kB Download
md5:d6029e8c4b14793847928d0f907c1bcc
153.1 kB Preview Download
md5:92fe8fa950c65a080605e99703ceceaf
315.7 kB Preview Download
md5:0640ce8029ad3c95c00e9aa175d70628
659.7 kB Preview Download

Additional details

Created:
August 19, 2023
Modified:
October 18, 2023