Multiparameter quantum critical metrology
- URL: http://arxiv.org/abs/2203.12676v1
- Date: Wed, 23 Mar 2022 19:00:01 GMT
- Title: Multiparameter quantum critical metrology
- Authors: Giovanni Di Fresco, Bernardo Spagnolo, Davide Valenti, Angelo Carollo
- Abstract summary: We argue that quantum criticality may also play a positive role in reducing the incompatibility in the simultaneous estimation of multiple parameters.
The antiferromagnetic and ferromagnetic 1-D Ising chain with both transverse and longitudinal fields are analysed.
- Score: 0.0
- License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
- Abstract: Single parameter estimation is known to benefit from extreme sensitivity to
parameter changes in quantum critical systems. However, the simultaneous
estimation of multiple parameters is generally limited due to the
incompatibility arising from the quantum nature of the underlying system. A key
question is whether quantum criticality may also play a positive role in
reducing the incompatibility in the simultaneous estimation of multiple
parameters. We argue that this is generally the case and verify this prediction
in paradigmatic quantum many-body systems close to first and second order phase
transitions. The antiferromagnetic and ferromagnetic 1-D Ising chain with both
transverse and longitudinal fields are analysed across different regimes and
close to criticality.
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