I have a Science subscription so can read the complete paper and supplementary material. Their current device has about two orders of magnitude greater linewidth (34 kHz) than the ~400 Hz linewidth predicted from maser theory. The coherence time is ~9.4 us. They suggest this is due to charge flunctuations, and show time domain examples of the I/Q downconverted signal with discontinuities where the device drops out of masing.
This is a moderately complex experimental setup, with very low signal levels requiring a superconducting Josephson parametric amplifier for some measurements at a reasonably S/N. The device maser cavity is superconducting. I agree that this is an initial proof of concept demonstrating masing with quantum dots. -- Bill Byrom N5BB Tektronix RF Application Engineer On Tue, Jan 20, 2015, at 01:51 AM, Attila Kinali wrote: > On Sun, 18 Jan 2015 22:59:57 +0000 > Mark Sims <hol...@hotmail.com> wrote: > > > http://www.princeton.edu/main/news/archive/S42/13/37M75/index.xml > > Not much detail there... but there is an article in Science. > > It looks like the supplemantary material[1] of the paper isnt behind a > pay wall. > > > Attila Kinali > > > [1] http://www.sciencemag.org/content/347/6219/285/suppl/DC1 > -- > It is upon moral qualities that a society is ultimately founded. All > the prosperity and technological sophistication in the world is of no > use without that foundation. > -- Miss Matheson, The Diamond Age, Neil Stephenson > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.