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Uncovering many-body correlations in nanoscale nuclear spin baths by central spin decoherence.


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.

SUBMITTER: Ma WL 

PROVIDER: S-EPMC4175593 | biostudies-literature | 2014 Sep

REPOSITORIES: biostudies-literature

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Uncovering many-body correlations in nanoscale nuclear spin baths by central spin decoherence.

Ma Wen-Long WL   Wolfowicz Gary G   Zhao Nan N   Li Shu-Shen SS   Morton John J L JJ   Liu Ren-Bao RB  

Nature communications 20140910


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  ...[more]

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