Quantum sensing of a coherent single spin excitation in a nuclear ensemble

• URL: http://arxiv.org/abs/2008.09541v1
• Date: Fri, 21 Aug 2020 15:35:59 GMT
• Title: Quantum sensing of a coherent single spin excitation in a nuclear ensemble
• Authors: Daniel M. Jackson, Dorian A. Gangloff, Jonathan H. Bodey, Leon Zaporski, Clara Bachorz, Edmund Clarke, Maxime Hugues, Claire Le Gall, Mete Atat\"ure
• Abstract summary: We use an electron spin qubit in a semiconductor quantum dot to sense a single nuclear-spin excitation with 1.9-ppm precision. We demonstrate this single-magnon precision across multiple modes identified by nuclear species and polarity. A direct extension of this work is to probe engineered quantum states of the ensemble including long-lived memory states.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: The measurement of single quanta in a collection of coherently interacting objects is transformative in the investigations of emergent quantum phenomena. An isolated nuclear-spin ensemble is a remarkable platform owing to its coherence, but detecting its single spin excitations has remained elusive. Here, we use an electron spin qubit in a semiconductor quantum dot to sense a single nuclear-spin excitation (a nuclear magnon) with 1.9-ppm precision via the 200-kHz hyperfine shift on the 28-GHz qubit frequency. We demonstrate this single-magnon precision across multiple modes identified by nuclear species and polarity. Finally, we monitor the coherent dynamics of a nuclear magnon and the emergence of quantum correlations competing against decoherence. A direct extension of this work is to probe engineered quantum states of the ensemble including long-lived memory states.

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