SciTech Daily March 13, 2022
Inability to easily read the information held in qubits, and the short coherence of qubits are impediments to the many technological applications of quantum science such as hacker proof communications networks and quantum computers. An international team of researchers (USA – University of Chicago, Argonne National Laboratory, Japan, Sweden) has demonstrated single-shot readout of single defects in SiC via spin-to-charge conversion, whereby the defect’s spin state was mapped onto a long-lived charge state. With this technique, they achieved over 80% readout fidelity without pre- or post-selection, resulting in a high signal-to-noise ratio that enabled them to measure long spin coherence times. Combined with pulsed dynamical decoupling sequences in an isotopically purified host material, they reported single-spin T2 > 5 seconds, over two orders of magnitude greater than previously reported in this system. The mapping of these coherent spin states onto single charges unlocks both single-shot readout for scalable quantum nodes and opportunities for electrical readout via integration with semiconductor devices…read more. Open Access TECHNICAL ARTICLEÂ
Single-shot readout of the divacancy charge state. Credit: SCIENCE ADVANCES, 2 Feb 2022, Vol 8, Issue 5Â