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quant-ph2019
Universal superposition codes: capacity regions of compound quantum broadcast channel with confidential messages
Holger Boche, Gisbert Janßen, Sajad Saeedinaeeni
We derive universal codes for transmission of broadcast and confidential messages over classical-quantum-quantum and fully quantum channels. These codes are robust to channel uncer…
quant-ph2017
Randomness cost of symmetric twirling
Holger Boche, Gisbert Janßen, Sajad Saeedinaeeni
We study random unitary channels which reproduce the action of the twirling channel corresponding to the representation of the symmetric groupon an n-fold tensor product. We derive…