Geodesic
Entanglement-assisted capacities of constrained quantum channels
Teoriâ veroâtnostej i ee primeneniâ, Tome 48 (2003) no. 2, pp. 359-374 Cet article a éte moissonné depuis la source Math-Net.Ru

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In this paper we fill a gap in previous works by proving the conjectured formula for the classical entanglement-assisted capacity of a quantum channel with additive constraint (such as the Bosonic Gaussian channel). Our main tools are the coding theorem for classical-quantum constrained channels and a finite-dimensional approximation of the input density operators for entanglement-assisted capacity. We also give sufficient conditions under which suprema in the capacity formulas are achieved.
Keywords: quantum communication channel, classical capacity, entangled state. 
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A. S. Holevo. Entanglement-assisted capacities of constrained quantum channels. Teoriâ veroâtnostej i ee primeneniâ, Tome 48 (2003) no. 2, pp. 359-374. http://geodesic.mathdoc.fr/item/TVP_2003_48_2_a7/

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