Every finite-dimensional degradable or antidegradable quantum channel has an exponential strong converse: above capacity, all coding schemes have fidelity decaying exponentially in the number of channel uses.
The capacity of a quantum channel for simultaneous transmission of classical and quantum information
1 Pith paper cite this work. Polarity classification is still indexing.
1
Pith paper citing it
abstract
An expression is derived characterizing the set of admissible rate pairs for simultaneous transmission of classical and quantum information over a given quantum channel, generalizing both the classical and quantum capacities of the channel. Although our formula involves regularization, i.e. taking a limit over many copies of the channel, it reduces to a single-letter expression in the case of generalized dephasing channels. Analogous formulae are conjectured for the simultaneous public-private capacity of a quantum channel and for the simultaneously 1-way distillable common randomness and entanglement of a bipartite quantum state.
fields
quant-ph 1years
2026 1verdicts
ACCEPT 1representative citing papers
citing papers explorer
-
Sharp Quantum Capacity Thresholds: Exponential Strong Converses for Degradable and Antidegradable Channels
Every finite-dimensional degradable or antidegradable quantum channel has an exponential strong converse: above capacity, all coding schemes have fidelity decaying exponentially in the number of channel uses.