title: A quantum phase switch between a single solid-state spin and a photon.
abstract: Interactions between single spins and photons are essential for quantum networks and distributed quantum computation. Achieving spin-photon interactions in a solid-state device could enable compact chip-integrated quantum circuits operating at gigahertz bandwidths. Many theoretical works have suggested using spins embedded in nanophotonic structures to attain this high-speed interface. These proposals implement a quantum switch where the spin flips the state of the photon and a photon flips the spin state. However, such a switch has not yet been realized using a solid-state spin system. Here, we report an experimental realization of a spin-photon quantum switch using a single solid-state spin embedded in a nanophotonic cavity. We show that the spin state strongly modulates the polarization of a reflected photon, and a single reflected photon coherently rotates the spin state. These strong spin-photon interactions open up a promising direction for solid-state implementations of high-speed quantum networks and on-chip quantum information processors using nanophotonic devices.
authors: Department of Electrical and Computer Engineering, Institute for Research in Electronics and Applied Physics, Joint Quantum Institute, University of Maryland, College Park, Maryland 20742, USA.
authors: Shuo
authors: http://orcid.org/0000-0003-4171-0466
authors: S
authors: Sun
authors: Department of Electrical and Computer Engineering, Institute for Research in Electronics and Applied Physics, Joint Quantum Institute, University of Maryland, College Park, Maryland 20742, USA.
authors: Hyochul
authors: H
authors: Kim
authors: Joint Quantum Institute, National Institute of Standards and Technology and University of Maryland, Gaithersburg, Maryland 20899, USA.
authors: Glenn S
authors: GS
authors: Solomon
authors: Department of Electrical and Computer Engineering, Institute for Research in Electronics and Applied Physics, Joint Quantum Institute, University of Maryland, College Park, Maryland 20742, USA.
authors: Edo
authors: E
authors: Waks