Physics – Quantum Physics
Scientific paper
2002-07-19
IEEE Trans. Information Theory, vol. 51, no. 12, pp. 4263--4277, 2005
Physics
Quantum Physics
25 pages, no figure. Ver.2: slight typographical errors and the inexact statement of a known result (Lemma 1) with a premise m
Scientific paper
The highest information rate at which quantum error-correction schemes work reliably on a channel, which is called the quantum capacity, is proven to be lower bounded by the limit of the quantity termed coherent information maximized over the set of input density operators which are proportional to the projections onto the code spaces of symplectic stabilizer codes. Quantum channels to be considered are those subject to independent errors and modeled as tensor products of copies of a completely positive linear map on a Hilbert space of finite dimension, and the codes that are proven to have the desired performance are symplectic stabilizer codes. On the depolarizing channel, this work's bound is actually the highest possible rate at which symplectic stabilizer codes work reliably.
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