A concrete qutrit channel has P=Q=0 at every blocklength while being neither PPT nor antidegradable, via a variance-dominating signed lift weaker than antidegradability.
Reverse-type data processing inequality
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Quantum Incapacity beyond No-Cloning and PPT Mechanisms
A concrete qutrit channel has P=Q=0 at every blocklength while being neither PPT nor antidegradable, via a variance-dominating signed lift weaker than antidegradability.