An Extreme Form of Superactivation for Quantum Zero-Error Capacities
نویسندگان
چکیده
منابع مشابه
On superactivation of one-shot zero-error quantum capacity and the related property of quantum measurements
We begin with a detailed description of a low dimensional quantum channel (dA = 4, dE = 3) demonstrating the symmetric form of superactivation of one-shot zero-error quantum capacity. This means appearance of a noiseless (perfectly reversible) subchannel in the tensor square of a channel having no noiseless subchannels. Then we describe a quantum channel Φ such that Q̄0(Φ) = 0 and Q̄0(Φ⊗ Φ) ≥ log...
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The superactivation of zero-capacity quantum channels makes it possible to use two zerocapacity quantum channels with a positive joint capacity at the output. Currently, we have no theoretical background for describing all possible combinations of superactive zerocapacity channels; hence, there may be many other possible combinations. In this PhD Thesis I provide an algorithmic solution to the ...
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We consider compound as well as arbitrarily varying classical-quantum channel models. For classical-quantum compound channels, we give an elementary proof of the direct part of the coding theorem. A weak converse under average error criterion to this statement is also established. We use this result together with the robustification and elimination technique developed by Ahlswede in order to gi...
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ژورنال
عنوان ژورنال: IEEE Transactions on Information Theory
سال: 2012
ISSN: 0018-9448,1557-9654
DOI: 10.1109/tit.2011.2178157