Adiabatic sensing technique for optimal temperature estimation using trapped ions

We propose an adiabatic method for optimal phonon temperature estimation using trapped ions which can be operated beyond the Lamb-Dicke regime. The quantum sensing technique relies on a time-dependent red-sideband transition of modes, described by nonlinear Jaynes-Cummings model in general. A unique feature our is that relevant information thermal distributions transferred to collective spin-degree freedom. show each state probabilities adiabatically mapped onto respective spin-excitation configuration and thus carried out simply performing spin-dependent laser fluorescence measurement at end transition. characterize uncertainty terms Fisher projection saturates fundamental Cramér-Rao bound oscillator equilibrium.Received 16 December 2020Accepted 22 February 2021DOI:https://doi.org/10.1103/PhysRevResearch.3.013244Published American Physical Society under Creative Commons Attribution 4.0 International license. Further distribution this work must maintain attribution author(s) published article's title, journal citation, DOI.Published SocietyPhysics Subject Headings (PhySH)Research AreasQuantum sensingQuantum Information