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Two-qubit Stabilizer Circuits with Recovery I: Existence van Dam, Wim Wong, Raymond stabilizer circuit recovery circuit magic state In this paper, we further investigate the many ways of using stabilizer operations to generate a single qubit output from a two-qubit state. In particular, by restricting the input to certain product states, we discover probabilistic operations capable of transforming stabilizer circuit outputs back into stabilizer circuit inputs. These secondary operations are ideally suited for recovery purposes and require only one extra resource input to proceed. As a result of reusing qubits in this manner, we present an alternative to the original state preparation process that can lower the overall costs of executing a two-qubit stabilizer procedure involving non-stabilizer resources. Schloss Dagstuhl – Leibniz-Zentrum für Informatik Wim van Dam and Raymond Wong 2018 Is Part Of LIPIcs, Volume 111, 13th Conference on the Theory of Quantum Computation, Communication and Cryptography (TQC 2018) InProceedings Text doc-type:ResearchArticle publishedVersion application/pdf doi:10.4230/LIPIcs.TQC.2018.7 urn:nbn:de:0030-drops-92540 https://drops.dagstuhl.de/entities/document/10.4230/LIPIcs.TQC.2018.7 eng https://creativecommons.org/licenses/by/3.0/legalcode