Towards scalable bosonic quantum error correction
Barbara Terhal (Forschungszentrum Jülich, TU Delft - QuTech Advanced Research Centre, TU Delft - QCD/Terhal Group, TU Delft - Quantum Computing)
J. Conrad (Helmholtz-Zentrum Berlin, Freie Universität Berlin)
C. Vuillot (CEA-CNRS-INRIA-Universite Paris-Sud-Universite de Versailles)
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Abstract
We review some of the recent efforts in devising and engineering bosonic qubits for superconducting devices, with emphasis on the Gottesman-Kitaev-Preskill (GKP) qubit. We present some new results on decoding repeated GKP error correction using finitely-squeezed GKP ancilla qubits, exhibiting differences with previously studied stochastic error models. We discuss circuit-QED ways to realize CZ gates between GKP qubits and we discuss different scenarios for using GKP and regular qubits as building blocks in a scalable superconducting surface code architecture.
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