On the Alberti-Uhlmann Condition for Unital Channels
We address the problem of existence of completely positive trace preserving (CPTP) maps between two sets of density matrices. We refine the result of Alberti and Uhlmann and derive a necessary and sufficient condition for the existence of a unital channel between two pairs of qubit states which ulti...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Verein zur Förderung des Open Access Publizierens in den Quantenwissenschaften
2020-11-01
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| Series: | Quantum |
| Online Access: | https://quantum-journal.org/papers/q-2020-11-08-360/pdf/ |