Cavity-Enhanced Optical Readout of a Single Solid-State Spin

Shuo Sun, Hyochul Kim, Glenn S. Solomon, and Edo Waks

Phys. Rev. Applied 9, 054013 – Published 9 May 2018

Abstract

We demonstrate optical readout of a single spin using cavity quantum electrodynamics. The spin is based on a single trapped electron in a quantum dot that has a poor branching ratio of 0.43. Selectively coupling one of the optical transitions of the quantum dot to the cavity mode results in a spin-dependent cavity reflectivity that enables spin readout by monitoring the reflected intensity of an incident optical field. Using this approach, we demonstrate spin-readout fidelity of 0.61. Achieving this fidelity using resonance fluorescence from a bare dot would require 43 times improvement in photon collection efficiency.

Received 17 June 2017
Revised 4 April 2018

DOI:https://doi.org/10.1103/PhysRevApplied.9.054013

Physics Subject Headings (PhySH)

Cavity quantum electrodynamics Nanophotonics Optical quantum information processing Photonic crystals Quantum information with hybrid systems Quantum information with solid state qubits Quantum optics

Quantum dots

Condensed Matter, Materials & Applied PhysicsAtomic, Molecular & OpticalQuantum Information, Science & Technology

Authors & Affiliations

Shuo Sun¹, Hyochul Kim¹, Glenn S. Solomon², and Edo Waks^1,*

¹Department of Electrical and Computer Engineering, Institute for Research in Electronics and Applied Physics, and Joint Quantum Institute, University of Maryland, College Park, Maryland 20742, USA
²Joint Quantum Institute, University of Maryland and National Institute of Standards and Technology, College Park, Maryland 20742, USA