Variable impedance Josephson junction traveling-wave parametric circuits
AssigneeInternational Business Machines Corporation
InventorsTed Thorbeck, Corrado P Mancini
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Abstract
A device comprises a Josephson junction traveling-wave parametric circuit. The Josephson junction traveling-wave parametric circuit comprises unit cells which are coupled in series to form a transmission line between an input port and an output port. Each unit cell comprises a series Josephson junction, and a capacitor shunted to ground. An impedance of the unit cells is varied along the transmission line to match an input impedance at the input port to an output impedance at the output port, wherein the input impedance and the output impedance are dissimilar.
Claims20
A device, comprising:
- a Josephson junction traveling-wave parametric circuit comprising unit cells which are coupled in series to form a transmission line between an input port and an output port, each unit cell comprising a series Josephson junction, and a capacitor shunted to ground;
- wherein an impedance of the unit cells is varied along the transmission line to match an input impedance at the input port to an output impedance at the output port, wherein the input impedance and the output impedance are dissimilar.
A device, comprising:
- a Josephson traveling-wave parametric amplifier circuit comprising unit cells which are coupled in series to form a transmission line between an input port and an output port, each unit cell comprising a series Josephson junction, and a capacitor shunted to ground;
- wherein an impedance of the unit cells is varied along the transmission line to cause the transmission line to have an increased effective electrical length compared to an unvaried impedance.
A system, comprising:
- a quantum processor comprising quantum bits;
- and
- a readout signal path configured to transmit signals that are readout from one or more of the quantum bits of the quantum processor, the readout signal path comprising a Josephson traveling-wave parametric amplifier circuit;
- wherein the Josephson traveling-wave parametric amplifier circuit comprises unit cells which are coupled in series to form a transmission line between an input port and an output port, each unit cell comprising a series Josephson junction, and a capacitor shunted to ground;
- and
- wherein an impedance of the unit cells is varied along the transmission line to cause the transmission line to have an increased effective electrical length compared to an unvaried impedance.
Dependencies are inferred from the claim text.