MRS Meetings and Events


QT07.02.01 2022 MRS Spring Meeting

Creating Integrated Quantum Systems using Classical Silicon Carbide Devices

When and Where

May 10, 2022
1:30pm - 2:00pm

Hawai'i Convention Center, Level 3, 305B



Christopher Anderson1,David Awschalom1,2

University of Chicago1,Argonne National Laboratory2


Christopher Anderson1,David Awschalom1,2

University of Chicago1,Argonne National Laboratory2
The neutral divacancy (VV0) in silicon carbide (SiC) exhibits robust spin coherence and a high-quality near-infrared spin-photon interface in a material compatible with mature fabrication techniques. Here, we make use of this scalable semiconductor host and design electronic devices to manipulate embedded isolated quantum systems [1]. Applying gigahertz ac electric fields to these SiC devices produces coherent interference in the form of Landau-Zener-Stückelberg fringes, arising from interactions between microwave and optical photons [2]. In this platform, we demonstrate lifetime-limited optical coherence and clock-like spin transitions with increased robustness against magnetic noise. Electrical driving of excited-state electron orbitals offers advantages over spin-based coupling and points towards new types of hybrid quantum systems.<br/><br/>We then discuss various strategies to extend the coherence of these spin qubits including isotopic purification, clock transitions, pulsed dynamical decoupling, and continuous driving to engineer a decoherence protected subspace. These subspaces are surprisingly decoupled from the major sources of noise for spin qubits, resulting in an over 10,000 times improvement in coherence [3]. Moreover, by exploiting a novel spin-to-charge mapping technique, we demonstrate single-shot readout of the quantum state and measure further extension of the single spin coherence by over two orders of magnitude to more than five seconds [4]. Finally, we demonstrate the control and entanglement of a single nuclear spin with an electron spin in SiC. This class of nuclear memories can further extend coherence and enable multi-qubit quantum registers [5]. These protocols require few key platform-independent components, suggesting that substantial coherence improvements can be achieved and deployed in a wide selection of quantum architectures.<br/><br/>[1] C. P. Anderson*, A. Bourassa* et al., <i>Science</i> <b>366</b>, 6470, 1225 (2019).<br/>[2] K. C. Miao et al., <i>Science Advances</i> <b>5</b>, 11, eaay0527 (2019).<br/>[3] K. C. Miao et al., <i>Science</i> <b>369</b>, 1493 (2020).<br/>[4] C. P. Anderson*, E. O. Glen*, et al., submitted (2021); arXiv 2110.01590.<br/>[5] A. Bourassa* and C. P. Anderson* et al., <i>Nature Materials</i> <b>19</b>, 1319 (2020).

Symposium Organizers

Andre Schleife, University of Illinois at Urbana-Champaign
Chitraleema Chakraborty, University of Delaware
Jeffrey McCallum, University of Melbourne
Bruno Schuler, Empa - Swiss Federal Laboratories for Materials Science and Technology

Publishing Alliance

MRS publishes with Springer Nature