Channel kets, entangled states, and the location of quantum information

Se p 20 04 Channel kets , entangled states , and the location of quantum information

The well-known duality relating entangled states and noisy quantum channels is expressed in terms of a channel ket, a pure state on a suitable tripartite system, which functions as a pre-probability allowing the calculation of statistical correlations between, for example, the entrance and exit of a channel, once a framework has been chosen so as to allow a consistent set of probabilities. In e...

ua nt - p h / 04 09 10 6 v 3 2 6 M ay 2 00 5 Channel kets , entangled states , and the location of quantum information

The well-known duality relating entangled states and noisy quantum channels is expressed in terms of a channel ket, a pure state on a suitable tripartite system, which functions as a pre-probability allowing the calculation of statistical correlations between, for example, the entrance and exit of a channel, once a framework has been chosen so as to allow a consistent set of probabilities. In e...

Characterization of Quantum Entangled States and Information Measures

Entangled Quantum States and the Kronecker Product

Entangled quantum states are an important component of quantum computing techniques such as quantum error-correction, dense coding and quantum teleportation. We determine the requirements for a state in the Hilbert space C C for N to be entangled and a solution to the corresponding “factorization” problem if this is not the case. We consider the implications of these criteria for computer algeb...

Quantum mutual information capacity for high-dimensional entangled states.

High-dimensional Hilbert spaces used for quantum communication channels offer the possibility of large data transmission capabilities. We propose a method of characterizing the channel capacity of an entangled photonic state in high-dimensional position and momentum bases. We use this method to measure the channel capacity of a parametric down-conversion state by measuring in up to 576 dimensio...