On quantum coding for ensembles of mixed states
Howard Barnum, Carlton M. Caves, Christopher A. Fuchs, Richard Jozsa, Benjamin Schumacher · 2000
We consider the problem of optimal asymptotically faithful compression for ensembles of mixed quantum states. Although the optimal rate is unknown, we prove upper and lower bounds and describe a series of illustrative examples of compression of mixed states. We also discuss a classical analogue of the problem. 1