Quantum thermometry with trapped ions

OPTICS COMMUNICATIONS

卷:436

Article

Ivanov, Peter A.¹ 

[1] St Kliment Ohridski Univ Sofia, Dept Phys, James Bourchier 5 Blvd, Sofia 1164, Bulgaria

关键词: Low temperature estimation;    Quantum Fisher information;    Trapped ions;   

DOI  :  10.1016/j.optcom.2018.12.013

来源: Elsevier

【 摘 要 】

We introduce the estimation protocol for detecting the temperature of the transverse vibrational modes of linear ion crystal. We show that thanks to the laser induced laser coupling between the vibrational modes and the collective spin states the estimation of the temperature is carried out by set of measurements of the spin populations. We show that temperature estimation protocol using single ion as a quantum probe is optimal in a sense that the set of state projective measurements saturate the fundamental Cramer-Rao bound. We find a plateau of the maximal temperature sensitivity using ion chain as a quantum probe. Moreover, we show that the non-classical part of the quantum Fisher information could leads to enhancement of the temperature sensitivity compared to the single ion case.

【 授权许可】

Free