Measurement of topological invariants with spin qubits in diamond

ORAL

Abstract

We present our measurements on topological invariants using spin qubits. The ground states of nitrogen-vacancy (NV) color centers in diamond are used as an ideal qubit whose states can be fully controlled by microwave frequency detuning, amplitude and relative phase. Manipulating these parameters on a closed manifold, we study the robustness of topological invariants against surrounding paramagnetic spins at room temperature. We also discuss how these measurements can be extended to qutrit or multi-qubit systems.

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Authors

  • Junghyun Lee

    Massachusetts Inst of Tech-MIT, Department of Physics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA

  • Keigo Arai

    Massachusetts Inst of Tech-MIT, Massachusetts Institute of Technology, Department of Physics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA

  • Chinmay Belthangady

    Harvard Smithsonian Center for Astrophysics

  • Ronald L. Walsworth

    Harvard-Smithsonian Center for Astrophysics, 60 Garden St., Cambridge, MA 02138, USA., Harvard Smithsonian Center for Astrophysics, Harvard-Smithsonian Center for Astrophysics, Department of Physics, Harvard University, Cambridge, Massachusetts 02138, USA