Anti-Zeno purification of spin baths by quantum probe measurements

Durga Bhaktavatsala Rao Dasari (), Sen Yang, Arnab Chakrabarti, Amit Finkler, Gershon Kurizki and Jörg Wrachtrup
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Durga Bhaktavatsala Rao Dasari: University of Stuttgart
Sen Yang: The Hong Kong University of Science and Technology
Arnab Chakrabarti: Weizmann Institute of Science
Amit Finkler: Weizmann Institute of Science
Gershon Kurizki: Weizmann Institute of Science
Jörg Wrachtrup: University of Stuttgart

Nature Communications, 2022, vol. 13, issue 1, 1-10

Abstract: Abstract The quantum Zeno and anti-Zeno paradigms have thus far addressed the evolution control of a quantum system coupled to an immutable bath via non-selective measurements performed at appropriate intervals. We fundamentally modify these paradigms by introducing, theoretically and experimentally, the concept of controlling the bath state via selective measurements of the system (a qubit). We show that at intervals corresponding to the anti-Zeno regime of the system-bath exchange, a sequence of measurements has strongly correlated outcomes. These correlations can dramatically enhance the bath-state purity and yield a low-entropy steady state of the bath. The purified bath state persists long after the measurements are completed. Such purification enables the exploitation of spin baths as long-lived quantum memories or as quantum-enhanced sensors. The experiment involved a repeatedly probed defect center dephased by a nuclear spin bath in a diamond at low-temperature.

Date: 2022
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DOI: 10.1038/s41467-022-35045-3

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