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

Presenter

Co-Author(s)

Christopher Anderson1,David Awschalom1,2

University of Chicago1,Argonne National Laboratory2

Abstract

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