Quantum Channel Capacities per Unit Cost

Quantum Channel Capacities Per Unit Cost

Communication over a noisy channel is often conducted in a setting in which different input symbols to the channel incur a certain cost. For example, for the additive white Gaussian noise channel, the cost associated with a real number input symbol is the square of its magnitude. In such a setting, it is often useful to know the maximum amount of information that can be reliably transmitted per...

On channel capacity per unit cost

Absfracf -Memoryless communicat ion channels with arbitrary alphabets where each input symbol is assigned a cost are considered. The max imum number of bits that can he transmitted reliably through the channel per unit cost is studied. It is shown that if the input alphabet contains a zero-cost symbol, then the capacity per unit cost admits a simple expression as the max imum normalized diverge...

Variations On Channel Capacity per Unit Cost

A Survey on Quantum Channel Capacities

Quantum information processing exploits the quantum nature of information. It offers fundamentally new solutions in the field of computer science and extends the possibilities to a level that cannot be imagined in classical communication systems. For quantum communication channels, many new capacity definitions were developed in comparison to classical counterparts. A quantum channel can be use...

On quantum fidelities and channel capacities

We show the equivalence of two different notions of quantum channel capacity: that which uses the entanglement fidelity as its criterion for success in transmission, and that which uses the minimum fidelity of pure states in a subspace of the input Hilbert space as its criterion. As a corollary, any source with entropy less than the capacity may be transmitted with high entanglement fidelity. W...