Patent US10074793

Incorporating arrays of Josephson junctions in a Josephson junction ring modulator in a Josephson parametric converter
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US10074793

1. A Josephson parametric converter, comprising: (5) (2)

a multi-Josephson junction ring modulator having arrays of N Josephson junctions arranged in a ring configuration with ring nodes inter-dispersed between the arrays, and further having a center node inter-connecting the ring nodes, wherein N is an integer having a value greater than one; and

a first and a second resonator formed from lumped-element capacitors that shunt the multi-Josephson junction ring modulator and respectively enable a first and a second mode of the Josephson parametric converter.

2. The Josephson parametric converter of claim 1, wherein a center frequency of the Josephson parametric converter is tunable by varying a magnetic flux threading the ring configuration. (0)

3. The Josephson parametric converter of claim 1, wherein a center frequency of the Josephson parametric converter is tunable by shunting each of the arrays of the multi-Josephson junction parametric converter by a linear shunt inductance. (2) (0)

7. The Josephson parametric converter of claim 1, wherein the N Josephson junctions in each of the arrays are connected in series. (0)

8. The Josephson parametric converter of claim 1, wherein the first resonator comprises at least one capacitor shunted across a first ring node a third ring node from among the ring nodes, and the second resonator comprises at least one other capacitor shunted across a second ring node and a fourth ring node from among the ring nodes. (1) (0)

10. The Josephson parametric converter of claim 1, further comprising a first, a second, a third, and a fourth coupling capacitor, each having a first electrode connected to a respective different one of the ring nodes of the multi-Josephson junction ring modulator, and having a second electrode for connecting to a respective one of a plurality of feedlines. (0)

11. A method, comprising: (5) (1)

forming a Josephson parametric converter, wherein said forming step includes: forming a multi-Josephson junction ring modulator having arrays of N Josephson junctions arranged in a ring configuration with ring nodes inter-dispersed between the arrays, and further having a center node inter-connecting the ring nodes, wherein N is an integer having a value greater than one; and

forming a first and a second resonator from lumped-element capacitors that shunt the multi-Josephson junction ring modulator and respectively enable a first and a second mode of the Josephson parametric converter.

12. The method of claim 11, wherein a center frequency of the Josephson parametric converter is tunable by varying a magnetic flux threading the ring configuration. (0)

13. The method of claim 11, wherein a center frequency of the Josephson parametric converter is tunable by shunting each of the arrays of the multi-Josephson junction parametric converter by a linear shunt inductance. (2) (0)

17. The method of claim 11, wherein the N Josephson junctions in each of the arrays are connected in series. (0)

18. The method of claim 11, wherein forming the first and the second resonator comprise: (1) (2)

20. The method of claim 11, further comprising forming a first, a second, a third, and a fourth coupling capacitor, each having a first electrode connected to a respective different one of the ring nodes of the multi-Josephson junction ring modulator, and having a second electrode for connecting to a respective one of a plurality of feedlines. (0)

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Patent US10074793

Incorporating arrays of Josephson junctions in a Josephson junction ring modulator in a Josephson parametric converter

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