Author

Marco Tomamichel

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Preprint Sep 2026

Strong Converses for Quantum Channel Capacities from Blowing-Up Lemmata

A quantum channel can transmit quantum states, classical messages, or classical messages that remain secret from its environment. We prove exponential strong converses for all three tasks over arbitrary finite-dimensional memoryless quantum channels, at their respective regularized capacities and allowing arbitrary ent...

Salman Beigi, Marco Tomamichel · 2 citations

Preprint Sep 2026

Parallel classical simulation of noisy shallow circuits: no quantum advantage in 1D

We consider quantum circuits consisting of $d$ layers of nearest-neighbor two-qubit gates acting on $n$ qubits arranged on a line, where every qubit is independently depolarized with a constant probability before each layer. We describe a randomized parallel algorithm which samples from the output distribution of any s...

Robert Koenig, Marco Tomamichel · 1 citation

Preprint Sep 2026

Making the most of leftovers: Improved privacy amplification for quantum key distribution

The amount of secret key that can be obtained from a quantum key distribution run depends on both the physically observed error rates and the mathematical bounds used to certify security. For finite datasets, conservative bounds force users to discard a substantial fraction of the potentially available key. Here we fur...

M. Tan, Bartosz Regula, Marco Tomamichel · 0 citations