Abstract:
:Central spin decoherence caused by nuclear spin baths is often a critical issue in various quantum computing schemes, and it has also been used for sensing single-nuclear spins. Recent theoretical studies suggest that central spin decoherence can act as a probe of many-body physics in spin baths; however, identification and detection of many-body correlations of nuclear spins in nanoscale systems are highly challenging. Here, taking a phosphorus donor electron spin in a (29)Si nuclear spin bath as our model system, we discover both theoretically and experimentally that many-body correlations in nanoscale nuclear spin baths produce identifiable signatures in decoherence of the central spin under multiple-pulse dynamical decoupling control. We demonstrate that under control by an odd or even number of pulses, the central spin decoherence is principally caused by second- or fourth-order nuclear spin correlations, respectively. This study marks an important step toward studying many-body physics using spin qubits.
journal_name
Nat Communjournal_title
Nature communicationsauthors
Ma WL,Wolfowicz G,Zhao N,Li SS,Morton JJ,Liu RBdoi
10.1038/ncomms5822subject
Has Abstractpub_date
2014-09-10 00:00:00pages
4822issn
2041-1723pii
ncomms5822journal_volume
5pub_type
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