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The quantum capacity is properly defined without encodings
H. Barnum, J. A. Smolin, B. M. Terhal
We show that no source encoding is needed in the definition of the capacity of a quantum channel for carrying quantum information. This allows us to use the coherent information ma…
Quantum Channel Capacity of Very Noisy Channels
David P. DiVincenzo, Peter W. Shor, John A. Smolin
We present a family of additive quantum error-correcting codes whose capacities exceeds that of quantum random coding (hashing) for very noisy channels. These codes provide non-zer…
Optimal Universal and State-Dependent Quantum Cloning
D. Bruss, D. P. DiVincenzo, A. Ekert +3
We establish the best possible approximation to a perfect quantum cloning machine which produces two clones out of a single input. We analyze both universal and state-dependent clo…
Capacities of Quantum Erasure Channels
Charles H. Bennett, David P. DiVincenzo, John A. Smolin
The quantum analog of the classical erasure channel provides a simple example of a channel whose asymptotic capacity for faithful transmission of intact quantum states, with and wi…