Three-qubit quantum register and quantum nondemolition detection using a single nitrogen-vacancy center

POSTER

Abstract

We experimentally demonstrate coherent control of a quantum register [1,2] consisting of three coupled spin qubits. In our experiments, the electronic spin of the nitrogen-vacancy (NV) center is the primary qubit that can be initialized/detected optically; the two proximal C-13 nuclear spins are ancillary qubits with long coherence times. We demonstrate the spin-exchange operation between the two C-13 nucleus, which enables the full control over three-qubit quantum register. In addition, we demonstrate repetitive quantum nondemolition detection (QND) of spin qubits. As an application, we discuss how such QND technique can improve the sensitivity of NV-based magnetometers [3,4]. [1] M. V. G. Dutt, et al., Science 316, 1312 (2007). [2] L. Jiang, et al., PRA 76, 062323 (2007). [3] J. R. Maze, et al., Nature 455, 644 (2008). [4] J. M. Taylor, et al., Nature Physics 4, 810 (2008).

Authors

  • Liang Jiang

    Harvard University

  • Jonathan Hodges

    Harvard University

  • Jero Maze

    Physics Department, Harvard University, ITAMP, Harvard-Smithsonian Center for Astrophysics, Harvard University, Department of Physics, Harvard University

  • Mikhail Lukin

    Physics Department, Harvard University, Cambridge, Massachusetts 02138, USA, Physics Department, Harvard University, Cambridge, MA 02138, USA, Harvard University, Department of Physics, Physics Department, Harvard University, Harvard University, Harvard University, Cambridge, MA 02138, USA