Coherent control and high-fidelity readout of chromium ions in commercial silicon carbide

Diler, Berk; Whiteley, Samuel J.; Anderson, Christopher P.; Wolfowicz, Gary; Wesson, Marie E.; Bielejec, Edward S.; Joseph Heremans, F.; Awschalom, David D.

doi:10.1038/s41534-020-0247-7

Coherent control and high-fidelity readout of chromium ions in commercial silicon carbide

Journal Article · Tue Jan 28 23:00:00 EST 2020 · npj Quantum Information

DOI:https://doi.org/10.1038/s41534-020-0247-7· OSTI ID:1619737

; ; ; ; Wesson, Marie E.; Bielejec, Edward S.; ;

Abstract

Transition metal ions provide a rich set of optically active defect spins in wide bandgap semiconductors. Chromium (Cr ⁴⁺ ) in silicon-carbide (SiC) produces a spin-1 ground state with a narrow, spectrally isolated, spin-selective, near-telecom optical interface. However, previous studies were hindered by material quality resulting in limited coherent control. In this work, we implant Cr into commercial 4H-SiC and show optimal defect activation after annealing above 1600 °C. We measure an ensemble optical hole linewidth of 31 MHz, an order of magnitude improvement compared to as-grown samples. An in-depth exploration of optical and spin dynamics reveals efficient spin polarization, coherent control, and readout with high fidelity (79%). We report T ₁ times greater than 1 s at cryogenic temperatures (15 K) with a T ₂ ^* = 317 ns and a T ₂ = 81 μs, where spin dephasing times are currently limited by spin–spin interactions within the defect ensemble. Our results demonstrate the potential of Cr ⁴⁺ in SiC as an extrinsic, optically active spin qubit.

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Sponsoring Organization:: USDOE

OSTI ID:: 1619737

Alternate ID(s):: OSTI ID: 1600463
OSTI ID: 1810394

Journal Information:: npj Quantum Information, Journal Name: npj Quantum Information Journal Issue: 1 Vol. 6; ISSN 2056-6387

Publisher:: Nature Publishing GroupCopyright Statement

Country of Publication:: United Kingdom

Language:: English

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Coherent control and high-fidelity readout of chromium ions in commercial silicon carbide

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Coherent control and high-fidelity readout of chromium ions in commercial silicon carbide

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