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quant-ph1999
Evaluating capacities of Bosonic Gaussian channels
A. S. Holevo, R. F. Werner
We show how to compute or at least to estimate various capacity-related quantities for Bosonic Gaussian channels. Among these are the coherent information, the entanglement assiste…
quant-ph1999
Optimal Manipulations with Qubits: Universal NOT Gate
V. Buzek, M. Hillery, R. Werner
It is not a problem to complement a classical bit, i.e. to change the value of a bit, a 0 to a 1 and vice versa. This is accomplished by a NOT gate. Complementing a qubit in an unk…