A technique relates to a microwave device. The microwave device includes a Josephson ring modulator, a first multimode resonator connected to the Josephson ring modulator, where the first multimode resonator is made of a first left-handed transmission line, and a second multimode resonator connected to the Josephson ring modulator, where the second multimode resonator is made of a second left-handed transmission line.
Please help me write a proper abstract based on the patent claims. CLAIM: 1. A microwave apparatus comprising: a Josephson ring modulator; a first multimode resonator connected to the Josephson ring modulator, wherein the first multimode resonator is made of a first left-handed transmission line; and a second multimode resonator connected to the Josephson ring modulator, wherein the second multimode resonator is made of a second left-handed transmission line. 2. The microwave apparatus of claim 1, wherein the first multimode resonator comprises a plurality of first resonance modes that couple to the Josephson ring modulator within a certain frequency band; and wherein the second multimode resonator comprises a plurality of second resonance modes that couple to the Josephson ring modulator within the certain frequency band. 3. The microwave apparatus of claim 1, wherein a number of a plurality of first resonance modes in the first multimode resonator which couple to the Josephson ring modulator within a certain frequency band is equal to a number of a plurality of second resonance modes in the second multimode resonator which couple to the Josephson ring modulator within the certain frequency band; or wherein the number of the plurality of first resonance modes in the first multimode resonator which couple to the Josephson ring modulator within a certain frequency band does not equal to the number of the plurality of second resonance modes in the second multimode resonator which couple to the Josephson ring modulator within the certain frequency band. 4. The microwave apparatus of claim 1, wherein the first multimode resonator comprises N amount of first unit cells; wherein the second multimode resonator comprises M amount of second unit cells; and wherein neither N nor M is equal to zero. 5. The microwave apparatus of claim 4, wherein each of the first unit cells and each of the second unit cells comprises a capacitor connected to one end of an inductor, while another end of the inductor is connected to a ground plane or conducting plane. 6. The microwave apparatus of claim 5, wherein the Josephson ring modulator comprises a first pair of nodes opposite one another and a second pair of nodes opposite one another; wherein the first multimode resonator is connected to the first pair of nodes; and wherein the second multimode resonator is connected to the second pair of nodes. 7. The microwave apparatus of claim 4, wherein each of the first unit cells and each of the second unit cells comprises a first inductor, a second inductor, and a capacitor; wherein first ends of the first inductor and the second inductor are connected together, while second ends of the first inductor and the second inductor are connected to ground; and wherein the capacitor is connected to the first ends. 8. The microwave apparatus of claim 4, wherein N equals M. 9. The microwave apparatus of claim 4, wherein N does not equal M. 10. The microwave apparatus of claim 4, wherein the first unit cells are connected to one another in series; and wherein the second unit cells are connected to one another in series. 11. The microwave apparatus of claim 4, wherein a capacitance and an inductance in the first multimode resonator varies from one unit cell to another in the first unit cells, thereby altering frequency spacing between certain eigenmodes of the first multimode resonator; and wherein a capacitance and an inductance in the second multimode resonator varies from one unit cell to another in the second unit cells, thereby altering frequency spacing between certain eigenmodes of the second multimode resonator. 12. The microwave apparatus of claim 4, wherein a capacitance and an inductance in each of the first unit cells is different from a capacitance and an inductance in each of the second unit cells. 13. The microwave apparatus of claim 4, wherein a capacitance and an inductance in each of the first unit cells match a capacitance and an inductance in each of the second unit cells. 14.-23. (canceled) 24. A microwave apparatus comprising: a Josephson ring modulator in a Wheatstone bridge configuration, the Josephson ring modulator comprising a first pair of nodes opposite one another and a second pair of nodes opposite one another; a first multimode resonator connected to the Josephson ring modulator, wherein the first multimode resonator is a first left-handed transmission line, the first multimode resonator being connected to the first pair of nodes, and wherein the first multimode resonator comprises first unit cells; a second multimode resonator connected to the Josephson ring modulator, wherein the second multimode resonator is a second left-handed transmission line, the second multimode resonator being connected to the second pair of nodes, and wherein the second multimode resonator comprises second unit cells; and a ground plane connected to inductors respectively in the first unit cells and the second unit cells, wherein capacitors connect to another end of the inductors respectively in the first unit cells and the second unit cells. 25. A microwave apparatus comprising: a Josephson ring modulator in a Wheatstone bridge configuration, the Josephson ring modulator comprising a first pair of nodes opposite one another and a second pair of nodes opposite one another; a first multimode resonator connected to the Josephson ring modulator, wherein the first multimode resonator is a first left-handed transmission line, a lumped-element side of the first multimode resonator being connected to one node in the first pair of nodes and a conducting plane being connected to another node in the first pair of nodes, and wherein the first multimode resonator comprises first unit cells; and a second multimode resonator connected to the Josephson ring modulator, wherein the second multimode resonator is a second left-handed transmission line, a lumped-element side of the second multimode resonator being connected to one node in the second pair of nodes and a conducting plane being connected to another node in the second pair of nodes, and wherein the second multimode resonator comprises second unit cells.