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Five-second coherence of a single spin with single-shot readout in silicon carbide

Journal Article · · Science Advances
 [1];  [1];  [1];  [1];  [1];  [1];  [1];  [1];  [2];  [3];  [2];  [3];  [4];  [4]
  1. Univ. of Chicago, IL (United States)
  2. National Institutes for Quantum Science and Technology, Takasaki (Japan)
  3. Linköping Univ. (Sweden)
  4. Univ. of Chicago, IL (United States); Argonne National Laboratory (ANL), Argonne, IL (United States)

An outstanding hurdle for defect spin qubits in silicon carbide (SiC) is single-shot readout, a deterministic measurement of the quantum state. Here, we demonstrate single-shot readout of single defects in SiC via spin-to-charge conversion, whereby the defect’s spin state is mapped onto a long-lived charge state. With this technique, we achieve over 80% readout fidelity without pre- or postselection, resulting in a high signal-to-noise ratio that enables us to measure long spin coherence times. Combined with pulsed dynamical decoupling sequences in an isotopically purified host material, we report 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.

Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division (MSE); National Science Foundation (NSF); US Air Force Office of Scientific Research (AFOSR); Defense Advanced Research Projects Agency (DARPA); US Department of the Navy, Office of Naval Research (ONR)
Grant/Contract Number:
AC02-06CH11357
OSTI ID:
2469999
Journal Information:
Science Advances, Journal Name: Science Advances Journal Issue: 5 Vol. 8; ISSN 2375-2548
Publisher:
AAASCopyright Statement
Country of Publication:
United States
Language:
English

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