quantum-capacity

Quantum capacity of correlated qubit phase-noise channels: Brownian and reset scaling laws, exact blocking, and finite-slot indistinguishability.

Entanglement-assisted quantum capacity of ordered deletion channels: sharp leading synchronization penalty and finite-block coding bounds.

Exact reflection-collection thresholds and quantum-capacity scaling for atomtronic channels, with proofs, atomic resource accounting, and reproducible checks.

Quantum capture limits for a bounded, Markov-noisy two-level receiver with free temporal encoding: exact channel simulation, zero/positive quantum-capacity boundaries, finite-time bounds, analytical proofs, and reproducible numerical checks.

Physical symmetry-memory laws and finite-deformation erasure limits.

Quantum capacity limits of photon counting and coherent single-mode environmental measurements under optical loss and mean-energy constraints.

Universal constant-gap bounds for the energy-constrained quantum capacity of bosonic dephasing channels with arbitrary phase-noise distributions.

Sharp bounds on quantum capacity for correlated erasure channels, with an exact capacity envelope and geometric loss models.

Exact quantum capacities under partial environmental observation and joint-register degradation. Includes optimal photon counting over all predetermined individual helper measurements in a qubit loss model, a strict collective-measurement rate advantage, and energy limits for vacuum optical splitting.

Proofs and reproducible certificates for geometric conditions that yield zero optimized single-use coherent information but positive quantum capacity in flagged qubit channels with noisy measurement records, including a certified eight-use witness.

Quantum communication limits under permutation projection and physical local noise.

Constant versus logarithmic reservoir-correlation cost for quantum communication at fixed loss and signal energy, with exact thermal marginals, a separable non-Gaussian construction, and Gaussian converse bounds.