[time-nuts] Maser on a chip

Bill Byrom time at radio.sent.com
Sun Jan 25 22:00:49 EST 2015

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

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 <holrum at 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
> -- 
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