Witness cloning is hard unless BQP contains NP, assuming a new conjecture that cloning hidden maximally entangled states reveals a circuit for the hidden subspace.
d oi:10.4230/LIPIcs.ITCS.2024.101
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On the hardness of cloning and connections to representation theory
Witness cloning is hard unless BQP contains NP, assuming a new conjecture that cloning hidden maximally entangled states reveals a circuit for the hidden subspace.