Abstract
Based on a quantum interferometric circuit, we implement a NMR quantum thermometer, in which a probe qubit measures the temperature of a nuclear spin at thermal equilibrium with a bath. The whole procedure lasts 5.5 ms, a much shorter time than the probe’s spin-lattice relaxation time, which is \(T_{1}=7.0\,\hbox {s}\). The fidelity of the probe final quantum state, in respect to the ideal theoretical prediction, is above 99 %. We show that quantum coherence is essential for the high fidelity of temperature measurement. We discuss the source of errors on the temperature measurement and some possible applications of the thermometer.
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Acknowledgments
We acknowledge suggestions from E. R. de Azevedo and S. O. Soares-Pinto from USP/São Carlos, and from L. C. Céleri from UFG, and financial support from CAPES, FAPERJ, and INCT of Quantum Information.
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Raitz, C., Souza, A.M., Auccaise, R. et al. Experimental implementation of a nonthermalizing quantum thermometer. Quantum Inf Process 14, 37–46 (2015). https://doi.org/10.1007/s11128-014-0858-z
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DOI: https://doi.org/10.1007/s11128-014-0858-z