Sequential measurements for quantum-enhanced magnetometry in spin chain
probes
- URL: http://arxiv.org/abs/2202.00114v3
- Date: Thu, 15 Sep 2022 07:19:58 GMT
- Title: Sequential measurements for quantum-enhanced magnetometry in spin chain
probes
- Authors: Victor Montenegro, Gareth Si\^on Jones, Sougato Bose, Abolfazl Bayat
- Abstract summary: We introduce a different approach to obtain quantum-enhanced sensitivity in a many-body probe through utilizing the nature of quantum measurement.
Our protocol consists of a sequence of local measurements, without re-initialization, performed regularly during the evolution of a many-body probe.
- Score: 0.0
- License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
- 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.
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