Waveguide-Coupled Photonic Crystal Cavity for Quantum Dot Spin Readout

Abstract

We present a waveguide-coupled photonic crystal H1 cavity structure in which the orthogonal dipole modes couple to spatially separated photonic crystal waveguides. Coupling of each cavity mode to its respective waveguide with equal efficiency is achieved by adjusting the position and orientation of the waveguides. The behavior of the optimized device is experimentally verified for where the cavity mode splitting is larger and smaller than the cavity mode linewidth. In both cases, coupled Q-factors up to 1600 and contrast ratios up to 10 are achieved. This design may allow for spin state readout of a self-assembled quantum dot positioned at the cavity center or function as an ultra-fast optical switch operating at the single photon level.

References in corpus (4)

• Photonic quantum technologies
• Mode identification of high-quality-factor single-defect nanocavities in quantum dot-embedded photonic crystals
• Optimizing H1 cavities for the generation of entangled photon pairs
• Enhanced photocurrent readout for a quantum dot qubit by bias modulation

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• Microring resonator-coupled photoluminescence from silicon W~centers
• Deterministic subtraction of single photons based on a coupled single quantum dot-cavity system
• Scheme for media conversion between electronic spin and photonic orbital angular momentum based on photonic nanocavity
• Chiral modes near exceptional points in symmetry broken H1 photonic crystal cavities