US 12,228,624 B1
Method and system to enhance cavity-spin coupling and hyperpolarize spin systems
Grum Teklemariam, Fairfax, VA (US)
Filed by Grum Teklemariam, Fairfax, VA (US)
Filed on Feb. 27, 2023, as Appl. No. 18/174,679.
Application 18/174,679 is a continuation of application No. 17/821,054, filed on Aug. 19, 2022, abandoned.
Claims priority of provisional application 63/236,757, filed on Aug. 25, 2021.
Int. Cl. G01R 33/28 (2006.01)
CPC G01R 33/282 (2013.01) 21 Claims
OG exemplary drawing
 
1. A method to hyperpolarize a spin ensemble, the method comprising:
resonantly coupling the spin ensemble to a cold cavity that is at a temperature below a spin temperature of the spin ensemble;
coupling the cold cavity to a squeezing cavity that is detuned from the cold cavity, the squeezing cavity squeezing the cold cavity such that coupling of the cold cavity to the spin ensemble increases to a sufficient strength to enable a spontaneous emission process to exceed a spin thermal relaxation process of the spin ensemble; and
coupling the squeezing cavity to a broadband squeezing cavity having a same squeezing parameter as the squeezing cavity and being phase-matched with the squeezing cavity for suppressing or canceling squeezed noise or heat generated by the squeezing cavity.