US 12,288,957 B2
Ultra-low noise cryogenic microwave amplification
Yuimaru Kubo, Onna-son Okinawa (JP); Jason Robert Ball, Onna-son Okinawa (JP); Petr Moroshkin, Onna-son Okinawa (JP); and Denis Konstantinov, Onna-son Okinawa (JP)
Assigned to Okinawa Institute of Science and Technology School Corporation, Okinawa (JP)
Filed by Okinawa Institute of Science and Technology School Corporation, Onna-son Okinawa (JP)
Filed on Jun. 12, 2023, as Appl. No. 18/208,531.
Application 18/208,531 is a continuation of application No. 16/806,874, filed on Mar. 2, 2020, granted, now 11,677,206.
Claims priority of provisional application 62/813,537, filed on Mar. 4, 2019.
Prior Publication US 2023/0327388 A1, Oct. 12, 2023
This patent is subject to a terminal disclaimer.
Int. Cl. H01S 1/02 (2006.01)
CPC H01S 1/02 (2013.01) 20 Claims
OG exemplary drawing
 
1. A microwave amplification system comprising:
a microwave amplifier comprising a paramagnetic material that includes an impurity, the impurity having a plurality of energy levels;
an input to receive a pumping signal;
an input to receive an input signal to be amplified by the microwave amplifier, wherein the input signal has lower power than the pumping signal;
wherein the pumping signal causes, at a millikelvin temperature range, a particular population inversion to a particular excited state corresponding to a particular energy level of the plurality of energy levels;
wherein the particular population inversion of the particular excited state corresponding to the particular energy level of the plurality of energy levels causes amplification of the input signal, thereby generating an amplified signal.