All unital qubit channels are 4-noisy operations

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Alexander Müller-Hermes, Christopher Perry

We show that any unital qubit channel can be implemented by letting the input system interact unitarily with a four-dimensional environment in the maximally mixed state and then tracing out the environment. We also provide an example where the dimension of such an environment has to be at least 3.

TidsskriftLetters in Mathematical Physics
Udgave nummer1
Sider (fra-til)1-9
StatusUdgivet - 2019

ID: 198652987