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This article relies largely or entirely on a single source. Relevant discussion may be found on the talk page. Please help improve this article by introducing citations to additional sources. Find sources: "Identity channel" – news · newspapers · books · scholar · JSTOR (March 2024)

In quantum information theory, the identity channel is a noise-free quantum channel. That is, the channel outputs exactly what was put in.

The identity channel is commonly denoted as ${\displaystyle I}$, ${\displaystyle {\mathsf {id}}}$ or ${\displaystyle \mathbb {I} }$.

References

1. Wilde, Mark (2013), Quantum Information Theory, Cambridge University Press, p. 618, ISBN 9781107034259.

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