Strong Spin-Photon Coupling in Silicon

Invited

Abstract

Long coherence times of single spins in Silicon quantum dots make these systems highly attractive for quantum computation. A crucial missing ingredient for realization of large networks of quantum dot based spin qubits has been long range coherent interconnects between them.
We report strong coupling of a single electron spin trapped in a silicon double quantum dot and a single microwave photon stored in a 1.3 mm long on-chip high-impedance superconducting resonator. The electric field component of the cavity photon couples directly to the charge dipole of the electron in the double dot, and indirectly to the electron spin, through a local magnetic field gradient from a nearby micromagnet. We extract charge-photon coupling strength g_C>200 MHz, and spin-photon coupling strength 2g_S>30 MHz, well above the combined decoherence rates of the spin and the photon.
This result opens the way to cavity-mediated quantum gates between spin qubits at millimeter range, removing a major roadblock for the scalability of spin based quantum processors.

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Presenters

  • Nodar Samkharadze

    QuTech, Delft University of Technology, Delft University of Technology, QuTech and Kavli Institute of Nanoscience, TU Delft

Authors

  • Nodar Samkharadze

    QuTech, Delft University of Technology, Delft University of Technology, QuTech and Kavli Institute of Nanoscience, TU Delft

  • Guoji Zheng

    QuTech, Delft University of Technology

  • Nima Kalhor

    QuTech, Delft University of Technology, QuTech and Kavli Institute of Nanoscience, TU Delft

  • Delphine Brousse

    QuTech, Delft University of Technology, QuTech and Netherlands Organization for Applied Research

  • Amir Sammak

    Delft Univ of Tech, QuTech, Delft University of Technology

  • Udson Mendes

    Institut quantique and Department de Physique, Universite de Sherbrooke, Physics, University of Sherbrooke, Institut quantique and Départment de Physique, Université de Sherbrooke

  • Alexandre Blais

    Institut quantique and Departement de Physique, Universite de Sherbrooke, Physique, Institut Quantique, University of Sherbrooke, Institut quantique and Department de Physique, Universite de Sherbrooke, Physique, Universite de Sherbrooke, Physics, University of Sherbrooke, Institut quantique and Départment de Physique, Université de Sherbrooke, Institut Quantique and Département de Physique, Université de Sherbrooke, Univ of Sherbrooke, Institut Quantique and Département de Physique, Université de Sherbooke, Institut quantique and Département de Physique, Université de Sherbrooke, Department of Physics, University of Sherbrooke

  • Giordano Scappucci

    Delft Univ of Tech, QuTech, Delft University of Technology, QuTech and Kavli Institute of Nanoscience, TU Delft

  • Lieven Vandersypen

    Delft University of Technology, QuTech and Kavli Institute of Nanoscience, TU Delft, QuTech & Kavli Institute of Nanoscience, TU Delft, QuTech, Delft University of Technology, QuTech and Kavli Institute of NanoScience, Delft University of Technology, TU Delft