Some Effects of Classical Feedback on the Classical Capacity of a Memoryless Quantum Channel

Details Some Effects of Classical Feedback on the Classical Capacity of a Memoryless Quantum Channel Some Effects of Classical Feedback on the Classical Capacity of a Memoryless Quantum Channel

2004-03-29

arxiv.org/abs/quant-ph/0403211v1

Physics

Quantum Physics

4-page preprint, no figures

Scientific paper

Classical feedback is defined here as the knowledge by the transmitter of the quantum state of the qubit received by the receiver. Such classical feedback doubles capacities of certain memoryless quantum channels without preexisting entanglement between transmitter and receiver. The increase in capacity, which is absent on classical memoryless channels, occurs because we can transform an entangled qubit pair into any other entangled state by applying a unitary operator to only one of the qubits.

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