Universal Compression of Ergodic Quantum Sources

Details Universal Compression of Ergodic Quantum Sources Universal Compression of Ergodic Quantum Sources

2003-02-24

arxiv.org/abs/quant-ph/0302174v3

Physics

Quantum Physics

17 pages, minor revision

Scientific paper

For a real number $r>0$, let $F(r)$ be the family of all stationary ergodic quantum sources with von Neumann entropy rates less than $r$. We prove that, for any $r>0$, there exists a blind, source-independent block compression scheme which compresses every source from $F(r)$ to $r n$ qubits per input block length $n$ with arbitrarily high fidelity for all large $n$. As our second result,we show that the stationarity and the ergodicity of a quantum source $\{\rho_m \}_{m=1}^{\infty}$ are preserved by any trace-preserving completely positive linear map of the tensor product form ${\cal E}^{\otimes m}$, where a copy of ${\cal E}$ acts locally on each spin lattice site. We also establish ergodicity criteria for so called classically-correlated quantum sources.

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