Andrew W. Cross, Graeme Smith, et al.
Physical Review A - AMO
Communication over a noisy quantum channel introduces errors in the transmission that must be corrected. A fundamental bound on quantum error correction is the quantum capacity, which quantifies the amount of quantum data that can be protected. We show theoretically that two quantum channels, each with a transmission capacity of zero, can have a nonzero capacity when used together. This unveils a rich structure in the theory of quantum communications, implying that the quantum capacity does not completely specify a channel's ability to transmit quantum information.
Andrew W. Cross, Graeme Smith, et al.
Physical Review A - AMO
Felix Leditzky, Debbie Leung, et al.
Physical Review Letters
Markus Grassl, Peter Shor, et al.
Physical Review A - AMO
Andrew Cross, Graeme Smith, et al.
ISIT 2008