Universal Quantum Information Compression
Richard Jozsa, Michał Horodecki, Paweł Horodecki, Ryszard Horodecki · Physical Review Letters · 1998
Suppose that a finite dimensional quantum source is known to have von Neumann entropy less than or equal to $S$ but is otherwise completely unspecified. We describe a method of universal quantum data compression which will faithfully compress the quantum information of any such source to $S$ qubits per signal (in the limit of large block lengths).