Alexei Ashikhmin, Simon Litsyn
Published 1997-09-23, updated 1997-09-29Version 2
Several upper bounds on the size of quantum codes are derived using the linear programming approach. These bounds are strengthened for the linear quantum codes.
Comments: 20 pages, 2 figures
Upper bounds on the quantum capacity for general attenuator and amplifier
Upper bounds on secret key agreement over lossy thermal bosonic channels
Improved lower and upper bounds for entanglement of formation
