%0 Journal Article %T Quantum POMDPs %A Jennifer Barry %A Daniel T. Barry %A Scott Aaronson %J Computer Science %D 2014 %I arXiv %R 10.1103/PhysRevA.90.032311 %X We present quantum observable Markov decision processes (QOMDPs), the quantum analogues of partially observable Markov decision processes (POMDPs). In a QOMDP, an agent's state is represented as a quantum state and the agent can choose a superoperator to apply. This is similar to the POMDP belief state, which is a probability distribution over world states and evolves via a stochastic matrix. We show that the existence of a policy of at least a certain value has the same complexity for QOMDPs and POMDPs in the polynomial and infinite horizon cases. However, we also prove that the existence of a policy that can reach a goal state is decidable for goal POMDPs and undecidable for goal QOMDPs. %U http://arxiv.org/abs/1406.2858v2