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Quantum Physics
Title: Sequential measurements for quantum-enhanced magnetometry in spin chain probes
(Submitted on 31 Jan 2022 (v1), last revised 15 Sep 2022 (this version, v3))
Abstract: Quantum sensors outperform their classical counterparts in their estimation precision, given the same amount of resources. So far, quantum-enhanced sensitivity has been achieved by exploiting the superposition principle. This enhancement has been obtained for particular forms of entangled states, adaptive measurement basis change, critical many-body systems, and steady-state of periodically driven systems. Here, we introduce a different approach to obtain quantum-enhanced sensitivity in a many-body probe through utilizing the nature of quantum measurement and its subsequent wave-function collapse without demanding prior entanglement. Our protocol consists of a sequence of local measurements, without re-initialization, performed regularly during the evolution of a many-body probe. As the number of sequences increases, the sensing precision is enhanced beyond the standard limit, reaching the Heisenberg bound asymptotically. The benefits of the protocol are multi-fold as it uses a product initial state and avoids complex initialization (e.g. prior entangled states or critical ground states) and allows for remote quantum sensing.
Submission history
From: Victor Montenegro [view email][v1] Mon, 31 Jan 2022 22:00:44 GMT (7145kb,D)
[v2] Wed, 2 Feb 2022 16:13:32 GMT (7156kb,D)
[v3] Thu, 15 Sep 2022 07:19:58 GMT (7483kb,D)
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