Tiny but precise: the most accurate quantum thermometers

   
   
An atom
05 Jun 2015 16:00:00.000

PA 82/15
Scientists have defined the smallest, most accurate thermometer allowed by the laws of physics — one that could detect the smallest fluctuations in microscopic regions, such as the variations within a biological cell.

The research, involving mathematicians at The University of Nottingham and published in the latest edition of the journal Physical Review Letters, focuses on the sensitivity of thermometers made up of just a handful of atoms and small enough to exhibit distinctive ‘quantum’ features.

Devising sensitive and practical nano-scale thermometers would represent a huge leap forward as such technology would enable a plethora of applications in bioscience, chemistry, physics and in the diagnosis and treatment of many diseases.
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The study was conducted as part of an ongoing collaboration between the Quantum Correlations Group in Nottingham’s School of Mathematical Sciences and the Quantum Information Group at Universitat Autònoma de Barcelona.

Dr Gerardo Adesso, who led Nottingham’s involvement in the study, said: “In this work we provide a full characterisation of those probes that estimate temperature with maximum accuracy and also the margin of error that must accompany any temperature estimate. To that end, we combine the tools of thermodynamics and ‘quantum metrology’, which deals with ultra-precise measurements on quantum systems, finding beautiful and insightful connections between the two.”

The academics also illustrate how by sacrificing some accuracy it is possible to gain other desirable features in a thermometer, such as a constant sensitivity over a wide range of temperatures.

Finally, they also looked at the maximum accuracy achievable in realistic situations in which the time available for the temperature measurement may be short due to unavoidable experimental limitations.

The study was funded by the European Research Council, which provides grants for scientific projects that enable Europe’s brightest minds to tackle research challenges such as climate change, health and ageing and economic governance.

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Notes to editors: The University of Nottingham has 43,000 students and is ‘the nearest Britain has to a truly global university, with campuses in China and Malaysia modelled on a headquarters that is among the most attractive in Britain’ (Times Good University Guide 2014). It is also one of the most popular universities in the UK among graduate employers and the winner of ‘Research Project of the Year’ at the THE Awards 2014. It is ranked in the world’s top one per cent of universities by the QS World University Rankings, and 8th in the UK by research power according to REF 2014.

The University of Nottingham in Malaysia (UNMC) is holding events throughout 2015 to celebrate 15 years as a pioneer of transnational education. Based in Semenyih, UNMC was established as the UK's first overseas campus in Malaysia and one of the first world-wide.

Impact: The Nottingham Campaign, its biggest-ever fundraising campaign, is delivering the University’s vision to change lives, tackle global issues and shape the future. More news…


Story credits

More information is available from Dr Gerardo Adesso in the School of Mathematical Sciences, University of Nottingham on +44 (0)115 846 6165, gerardo.adesso@nottingham.ac.uk

Emma Thorne Emma Thorne - Media Relations Manager

Email: emma.thorne@nottingham.ac.uk Phone: +44 (0)115 951 5793 Location: University Park

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