The Transition from Quantum to Classical in weak measurements and reconstruction of Quantum Correlation

• URL: http://arxiv.org/abs/2104.04507v3
• Date: Wed, 1 Mar 2023 16:09:48 GMT
• Title: The Transition from Quantum to Classical in weak measurements and reconstruction of Quantum Correlation
• Authors: Vadim Vorobyov, Jonas Meinel, Hitoshi Sumiya, Shinobu Onoda, Junichi Isoya, Oleg Gulinsky and J\"org Wrachtrup
• Abstract summary: We show that the relation between the readout signal of a single electron spin and the quantum dynamics of the single nuclear spin is given by a parameter related to the measurement strength. We prove the validity of our approach by measuring violations of the Leggett-Garg inequality.
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• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: The ability to follow the dynamics of a quantum system in a quantitative manner is of key importance for quantum technology. Despite its central role, justifiable deduction of the quantum dynamics of a single quantum system in terms of a macroscopical observable remains a challenge. Here we show that the relation between the readout signal of a single electron spin and the quantum dynamics of the single nuclear spin is given by a parameter related to the measurement strength. We determine this measurement strength in independent experiments and use this value to compare our analysis of the quantum dynamics with experimental results. We prove the validity of our approach by measuring violations of the Leggett-Garg inequality.

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