Identity channel

In quantum information theory, the identity channel is a noise-free quantum channel. That is, the channel outputs exactly what was put in.^[1]

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

References

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

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