# Experimental implementation of a nonthermalizing quantum thermometer

Experimental implementation of a nonthermalizing quantum thermometer 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 $$T_{1}=7.0\,\hbox {s}$$ T 1 = 7.0 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. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Quantum Information Processing Springer Journals

# Experimental implementation of a nonthermalizing quantum thermometer

, Volume 14 (1) – Nov 4, 2014
10 pages

/lp/springer_journal/experimental-implementation-of-a-nonthermalizing-quantum-thermometer-WQPUdTSc0Z
Publisher
Springer Journals
Subject
Physics; Quantum Information Technology, Spintronics; Quantum Computing; Data Structures, Cryptology and Information Theory; Quantum Physics; Mathematical Physics
ISSN
1570-0755
eISSN
1573-1332
D.O.I.
10.1007/s11128-014-0858-z
Publisher site
See Article on Publisher Site

### 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 $$T_{1}=7.0\,\hbox {s}$$ T 1 = 7.0 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.

### Journal

Quantum Information ProcessingSpringer Journals

Published: Nov 4, 2014

### References

• Quantum thermometry using the ac Stark shift within the Rabi model
Higgins, KDB; Lovett, BW; Gauger, EM

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