A Limit on the Power of Entanglement-Assistance in Quantum Communication
A Limit on the Power of Entanglement-Assistance in Quantum Communication
The optimal rate of reliable communication over a quantum channel can be enhanced by pre-shared entanglement. Whereas the enhancement may be unbounded in infinite-dimensional settings even when the input power is constrained, a long-standing conjecture asserts that the ratio between the entanglement-assisted and unassisted classical capacities is bounded in finite-dimensional …