Coupling surface acoustic wave resonators to a josephson ring modulator

Abstract

A superconducting device that mixes surface acoustic waves and techniques for fabricating the same are provided. A superconducting device can comprise a first surface acoustic wave resonator comprising a first low-loss piezo-electric dielectric substrate. The superconducting device can also comprise a second surface acoustic wave resonator comprising a second low-loss piezo-electric dielectric substrate. Further, the superconducting device can comprise a Josephson ring modulator coupled to the first surface acoustic wave resonator and the second surface acoustic wave resonator. The Josephson ring modulator is a dispersive nonlinear three-wave mixing element.

What is claimed is: 
     
         1 . A superconducting circuit, comprising:
 a first surface acoustic wave resonator;   a second surface acoustic wave resonator; and   a Josephson ring modulator coupled to the first surface acoustic wave resonator and the second surface acoustic wave resonator.   
     
     
         2 . The superconducting device of  claim 1 , wherein the first surface acoustic wave resonator comprises a first superconducting Bragg mirror and a second superconducting Bragg mirror separated from the first superconducting Bragg mirror by a first distance, and wherein the second surface acoustic wave resonator comprises a third superconducting Bragg mirror and a fourth superconducting Bragg mirror separated from the third superconducting Bragg mirror by a second distance, and wherein the first distance and the second distance are odd integer multiples of a half-wavelength supported by the first surface acoustic wave resonator and the second surface acoustic wave resonator. 
     
     
         3 . The superconducting device of  claim 1 , wherein the first surface acoustic wave resonator is spatially and spectrally separated from the second surface acoustic wave resonator. 
     
     
         4 . The superconducting device of  claim 1 , further comprising:
 a first coupling capacitor connected via a first superconducting wire to a first port of a pump; and   a second coupling capacitor connected via a second superconducting wire to a second port of the pump, wherein the first superconducting wire and the second superconducting wire are phase matched.   
     
     
         5 . The superconducting device of  claim 1 , further comprising:
 a first external feedline coupled to the first surface acoustic wave resonator through a first interdigitated capacitance device, wherein the first external feedline carries first input signals and first output signals of the first surface acoustic wave resonator; and   a second external feedline coupled to the second surface acoustic wave resonator through a second interdigitated capacitance device, wherein the second external feedline carries second input signals and second output signals of the second surface acoustic wave resonator.   
     
     
         6 . The superconducting device of  claim 1 , further comprising:
 one or more external superconducting magnetic coils that induce magnetic flux threading of the Josephson ring modulator.   
     
     
         7 . The superconducting device of  claim 1 , wherein the first surface acoustic wave resonator and the second surface acoustic wave resonator comprise respective dielectric substrates that comprise a material selected from a group of materials consisting of quartz, gallium arsenide, lithium niobite, and zinc oxide. 
     
     
         8 . A method, comprising:
 coupling a first surface acoustic wave resonator to a Josephson ring modulator; and   coupling a second surface acoustic wave resonator to the Josephson ring modulator.   
     
     
         9 . The method of  claim 8 , wherein the first surface acoustic wave resonator comprises a first superconducting Bragg mirror and a second superconducting Bragg mirror separated from the first superconducting Bragg mirror by a first distance, and wherein the second surface acoustic wave resonator comprises a third superconducting Bragg mirror and a fourth superconducting Bragg mirror separated from the third superconducting Bragg mirror by a second distance, and wherein the first distance and the second distance are odd integer multiples of a half-wavelength supported by the first surface acoustic wave resonator and the second surface acoustic wave resonator. 
     
     
         10 . The method of  claim 8 , wherein the first surface acoustic wave resonator is spatially and spectrally separated from the second surface acoustic wave resonator. 
     
     
         11 . The method of  claim 8 , further comprising:
 connecting a first coupling capacitor to a first port of a pump via a first superconducting wire; and   connecting a second coupling capacitor to a second port of the pump via a second superconducting wire, wherein the first superconducting wire and the second superconducting wire are phase matched.   
     
     
         12 . The method of  claim 8 , further comprising:
 coupling a first external feedline to the first surface acoustic wave resonator through a first interdigitated capacitance device, wherein the first external feedline carries first input signals and first output signals of the first surface acoustic wave resonator; and   coupling a second external feedline to the second surface acoustic wave resonator through a second interdigitated capacitance device, wherein the second external feedline carries second input signals and second output signals of the second surface acoustic wave resonator.   
     
     
         13 . The method of  claim 8 , further comprising:
 coupling one or more external superconducting magnetic coils to a superconducting device comprising the Josephson ring modulator, wherein magnetic flux threading of the Josephson ring modulator is induced through the one or more external superconducting magnetic coils.   
     
     
         14 . The method of  claim 8 , wherein the first surface acoustic wave resonator and the second surface acoustic wave resonator comprise respective dielectric substrates that comprise a material selected from a group of materials consisting of quartz, gallium arsenide, lithium niobite, and zinc oxide. 
     
     
         15 . A superconducting device, comprising:
 a first surface acoustic wave resonator;   a second surface acoustic wave resonator; and   a Josephson ring modulator coupled to the first surface acoustic wave resonator and the second surface acoustic wave resonator, wherein the Josephson ring modulator is a dispersive nonlinear three-wave mixing element.   
     
     
         16 . The superconducting device of  claim 15 , wherein the first surface acoustic wave resonator comprises a first superconducting Bragg mirror and a second superconducting Bragg mirror separated from the first superconducting Bragg mirror by a first distance, and wherein the second surface acoustic wave resonator comprises a third superconducting Bragg mirror and a fourth superconducting Bragg mirror separated from the third superconducting Bragg mirror by a second distance, and wherein the first distance and the second distance are odd integer multiples of a half-wavelength supported by the first surface acoustic wave resonator and the second surface acoustic wave resonator. 
     
     
         17 . The superconducting device of  claim 15 , wherein the first surface acoustic wave resonator is spatially and spectrally separated from the second surface acoustic wave resonator. 
     
     
         18 . The superconducting device of  claim 15 , further comprising:
 a first coupling capacitor connected via a first superconducting wire to a first port of a pump; and   a second coupling capacitor connected via a second superconducting wire to a second port of the pump, wherein the first superconducting wire and the second superconducting wire are phase matched.   
     
     
         19 . The superconducting device of  claim 15 , further comprising:
 a first external feedline coupled to the first surface acoustic wave resonator through a first interdigitated capacitance device, wherein the first external feedline carries first input signals and first output signals of the first surface acoustic wave resonator; and   a second external feedline coupled to the second surface acoustic wave resonator through a second interdigitated capacitance device, wherein the second external feedline carries second input signals and second output signals of the second surface acoustic wave resonator.   
     
     
         20 . The superconducting device of  claim 15 , further comprising:
 one or more external superconducting magnetic coils that induce magnetic flux threading of the Josephson ring modulator.