A 280-Nanometre Diamond Reached a 682 Microkelvin Resolution Floor: Cambridge, Warwick and Cardiff, 4 September 2026

Quentir Medicine Monitor

Evidence-based insights for quantum medicine.

On 4 September 2026 a group drawn from the Cavendish Laboratory at the University of Cambridge, the University of Warwick and Cardiff University posted a preprint on nanoscale thermometry with a free-standing diamond particle. Jack W. Hart, Soham Pal, Julien R. E. Roth, Katie Ninham, Abbie H. Aleksandrova, Xander Peetroons, Soumen Mandal, Oliver A. Williams, Gavin W. Morley, Mete Atature and Helena S. Knowles report that the platform as a whole reaches roughly an order of magnitude better sensitivity than previously published nanodiamond figures.

Three numbers carry the result, and each needs its qualifier. The paper reports an extrapolated resolution floor of 682 microkelvin, a figure derived from the fitting error of the functional form rather than from a single demonstrated reading; the average error on a temperature measurement that took 83 seconds to acquire was 11.9 millikelvin. The sensor is a 280-nanometre nanodiamond ball-milled from isotopically purified carbon-12, small enough in principle to sit inside a cell and holding two nitrogen-vacancy centers rather than one. And the same paper measures the heat its own readout laser pours into the sample, finding 337 millikelvin of heating for every milliwatt of incident optical power, with an observed maximum rise of 224 millikelvin at 0.63 milliwatts, which is some 330 times the extrapolated resolution floor.