For a partially degradable (PD) channel, the channel output state can be used to simulate the degraded environment state. The quantum capacity of a PD channel has been proven to be additive. Here, we show that the private classical capacity of arbitrary dimensional PD channels is equal to the quantum capacity of the channel and also single-letterizes. We prove that higher rates of private class...

A channel capacity is non-convex if the capacity of a mixture of different quantum channels exceeds the mixture of the individual capacities. This implies that there is a concrete communication scenario in which a sender can increase the transmission rate by forgetting which channel acts on the channel input. Previously, this surprising property had only been shown for the quantum capacity. Her...

This article argues that, properly analysed, the common law and the European Convention on Human Rights (ECHR) march hand in hand with the provisions of the Mental Capacity Act 2005 (MCA 2005) so as to impose a set of requirements on litigation friends acting for the subject of applications of proceedings before the Court of Protection ('P') which are very different to those currently understoo...

introduction: a growing number of muslim athletes now engage in international competition. this raises the question of the advice they should be given if a major event occurs during the month of ramadan. methods: a narrative review has been based upon books and extensive reviews completed by the author and other investigators. results: practical considerations hamper assessment of the effects o...

Motivated by channel measurements in different indoor locations we will show that the WLAN indoor MIMO channel is characterized by few dominant transmission paths mainly corresponding to the LOS path and some strong reflections. In the contrary to the common statistical flat Rayleigh fading channel model we will explain that the WLAN channel is widely deterministic and frequency selective. Furt...

We exhibit a possible road towards a strong converse for the quantum capacity of degradable channels. In particular, we show that all degradable channels obey what we call a “pretty strong” converse: When the code rate increases above the quantum capacity, the fidelity makes a discontinuous jump from 1 to at most 1 √ 2 , asymptotically. A similar result can be shown for the private (classical) ...

The U.S. joint military medical community has an increasing role in collaborative health sector engagement internationally as part of a whole of government approach to successful operations. The military must master the ability to catalyze health sector gains that can be developed by hosts, U.S. Government, and international agencies in both permissive environments and conflict zones. Capacity ...

We study the one-shot zero-error classical capacity of quantum channels assisted by quantum non-signalling correlations, and the reverse problem of simulation. Both lead to simple semi-definite programmings whose solutions can be given in terms of the conditional min-entropies. We show that the asymptotic simulation cost is precisely the conditional min-entropy of the Choi-Jamiołkowski matrix o...