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Conference on Lasers and Electro-Optics

Spin Dynamics of Single Er3+ Ions in a Silicon Nanophotonic Cavity

Songtao Chen, Mouktik Raha, Christopher M. Phenicie, Alan Dibos, Jeffrey D. Thompson

Published Jan 1, 2019• 0 citations
Publisher

Abstract

Magnetic field orientation and strength dependent spin dynamics is studied for the 1.536 µm telecom transitions of single Er3+ ions in Y2SiO5. Long spin T1 = 2 seconds is measured from ground state Zeeman spin levels.
DOI
10.1364/cleo_at.2019.jth5c.1

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Magnetic field orientation and strength dependent spin dynamics is studied for the 1.536 μm\mu \mathrm{m}μm telecom transitions of single Er3+ ions in Y 2 SiO 5 . Long spin T1=2T_{1}=2T1​=2 seconds is measured from ground state Zeeman spin levels. © 2019 The Author(s)
The influence of the anisotropic Zeeman effect on optical decoherence was studied for the 1.54 μm telecom transition in Er3+:Y2SiO5 using photon echo spectroscopy as a function of applied magnetic field orientation and strength. The decoherence strongly correlates with the Zeeman energy splittings described by the ground- and excited-state g factor variations for all inequivalent Er3+ sites, with the observed decoherence times arising from the combined effects of the magnetic dipole-dipole coupling strength and the ground- and excited-state spin-flip rates, along with the natural lifetime of the upper level. The decoherence time was maximized along a preferred magnetic field orientation that minimized the effects of spectral diffusion and that enabled the measurement of an exceptionally narrow optical resonance in a solid—demonstrating a homogeneous linewidth as narrow as 73 Hz.
Spins in silicon that are accessible via a telecom-compatible optical transition are a versatile platform for quantum information processing that can leverage the well-established silicon nanofabrication industry. Key to these applications are long coherence times on the optical and spin transitions to provide a robust system for interfacing photonic and spin qubits. Here, we report telecom-compatible Er3+ sites with long optical and electron spin coherence times, measured within a nuclear spin-free silicon crystal (<0.01% 29Si) using optical detection. We investigate two sites and find 0.1 GHz optical inhomogeneous linewidths and homogeneous linewidths below 70 kHz for both sites. We measure the electron spin coherence time of both sites using optically detected magnetic resonance and observe Hahn echo decay constants of 0.8 ms and 1.2 ms at around 11 mT. These optical and spin properties of Er3+:Si are an important milestone towards using optically accessible spins in silicon for a broad range of quantum information processing applications.