Novel analytical link between qubit depolarizing noise and bosonic Gaussian channels improves lower bounds on quantum capacity threshold from p≥0.1940 to p≥0.2029, offering new insights into symmetric code optimization.

#QuantumCapacity #QuantumErrorCorrection #Research

Proves polynomial fidelity decay O(1/n) for codes exceeding capacity on pure-loss bosonic channels, establishing fundamental limits on quantum communication without energy constraints using quantum hypothesis testing methods.

#QuantumInformation #QuantumChannels #QuantumCapacity

Proves exponential decay of entanglement-transmission fidelity beyond quantum capacity for all finite-dimensional channels via quantum blowing-up lemma and polynomial projector approximations.

#QuantumInformationTheory #QuantumCommunication #QuantumCapacity