# Optimal learning of quantum channels in diamond distance

Source: [nature.com](https://www.nature.com/articles/s41567-026-03499-7) · 2026-11-12 · Physics
Page: https://themorning.science/story/optimal-learning-of-quantum-channels-in-diamond-distance-128b1c4a9587b51d
Kind: research · Impact: low

## In brief

- Nature Physics published a paper on the optimal number of uses needed to learn an unknown quantum channel to a given accuracy in diamond distance.
- The paper was published online on 12 November 2026 with DOI 10.1038/s41567-026-03499-7.
- The source is a short abstract excerpt describing quantum channels as models of state evolution, including unitary evolution and measurement.

## Why it matters

It establishes a theoretical limit on how many experimental uses are needed to characterise a quantum process precisely, which guides the design of quantum device calibration and verification.

## Timeline

- 2026-11-12: Paper published online in Nature Physics

## Coverage

- [Optimal learning of quantum channels in diamond distance](https://www.nature.com/articles/s41567-026-03499-7) — nature.com, 2026-11-12

Tags: quantum channels, quantum learning, diamond distance, quantum information, quantum physics

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Brief generated by AI (claude-haiku-5-5) from the reporting listed under Coverage. Headlines belong to their publishers. The Morning Science – https://themorning.science