Black holes are almost optimal quantum cloners

Details Black holes are almost optimal quantum cloners Black holes are almost optimal quantum cloners

2006-01-11

arxiv.org/abs/quant-ph/0601065v1

Physics

Quantum Physics

4 pages, 3 figures

Scientific paper

We show that black holes clone incoming quantum states with a fidelity that depends on the black hole's absorption coefficient. Perfectly reflecting black holes are optimal universal quantum cloners of the type described by Simon, Weihs, and Zeilinger [1], and operate on the principle of stimulated emission. In the limit of perfect absorption, the fidelity of clones is equal to what can be obtained via quantum state estimation methods, which is suboptimal. But for any absorption probability less than one, the cloning fidelity is nearly optimal as long as omega/T >=10, a common parameter for modest-sized black holes.

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