Alexander Müller-Hermes

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quant-ph2025

Monogamy of entanglement between cones

Guillaume Aubrun, Alexander MÃ¼ller-Hermes, Martin PlÃ¡vala

A separable quantum state shared between parties $A$ and $B$ can be symmetrically extended to a quantum state shared between party $A$ and parties $B_{1}, \dots, B_{k}$ for every $k\in…

quant-ph2024

Fault-tolerant Coding for Quantum Communication

Matthias Christandl, Alexander MÃ¼ller-Hermes

Designing encoding and decoding circuits to reliably send messages over many uses of a noisy channel is a central problem in communication theory. When studying the optimal transmi…

quant-ph2024

Fault-tolerant Coding for Entanglement-Assisted Communication

Paula Belzig, Matthias Christandl, Alexander MÃ¼ller-Hermes

Channel capacities quantify the optimal rates of sending information reliably over noisy channels. Usually, the study of capacities assumes that the circuits which sender and recei…