Entanglement and optimal strings of qubits for memory channels
arXiv:quant-ph/0611130 · doi:10.1103/PhysRevA.74.062311
Abstract
We investigate the problem of enhancement of mutual information by encoding classical data into entangled input states of arbitrary length and show that while there is a threshold memory or correlation parameter beyond which entangled states outperform the separable states, resulting in a higher mutual information, this memory threshold increases toward unity as the length of the string increases. These observations imply that encoding classical data into entangled states may not enhance the classical capacity of quantum channels.
14 pages, 8 figures, latex, accepted for publication in Physical Review A
References in corpus (4)
- Entangled states maximize the two qubit channel capacity for some Pauli channels with memory
- Quantum entanglement enhances the capacity of bosonic channels with memory
- Entanglement enhanced classical capacity of quantum communication channels with correlated noise in arbitrary dimensions
- Transition behavior in the capacity of correlated-noisy channels in arbitrary dimensions