Josephson traveling wave parametric amplifier

A parametric amplifier and traveling wave technology, applied in the field of superconducting traveling wave parametric amplifiers

Active Publication Date: 2021-09-21
TEKNOLOGIAN TUTKIMUSKESKUS VTT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

If the nonlinearity is strong enough, this will result in a gain at the signal frequency

Method used

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Embodiment Construction

[0011] According to the solution disclosed herein, the traveling wave parametric amplifier can be made less sensitive to dimensional errors of the smaller Josephson junctions in a Josephson element comprising larger and smaller Josephson junctions by proper choice of parameters. Furthermore, a gradient layout of Josephson elements is disclosed which makes the elements only sensitive to magnetic field gradients, and flux bias lines in traveling wave parametric amplifiers are provided to generate such field gradients. Additionally, the transmission line can be tapered. Collectively, with one or more of these enhancements, a traveling wave parametric amplifier may be more suitable for use in practical applications because its operation is less sensitive to disturbances and manufacturing imperfections.

[0012] figure 1 Example amplifiers are shown in accordance with at least some embodiments of the invention. In general, for example in quantum computing, signals may be decayed ...

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Abstract

According to an example aspect of the present invention, there is provided a traveling wave parametric amplifier comprising a waveguide transmission line comprising therein at least ten Josephson elements, wherein each of the at least ten Josephson element comprises a loop, with exactly one Josephson junction of first size on one half of the loop and at least two Josephson junctions of a second size on a second half of the loop, the second size being larger than the first size, a flux bias line configured to generate a magnetic flux threading each of the at least one loop, and a set of resistors coupled with the flux bias line.

Description

technical field [0001] The present invention relates to superconducting traveling wave parametric amplifiers (TWPA). Background technique [0002] A parametric amplifier is actually a mixer in which a weaker input signal can be amplified by mixing it with a stronger pump signal to produce a stronger output signal. Parametric amplifiers rely on the nonlinear response of physical systems to produce amplification. Such amplifiers may include standing wave parametric amplifiers or traveling wave parametric amplifiers, where traveling wave parametric amplifiers use a series of nonlinear elements distributed along the transmission line, such as eg coplanar waveguides. Where the nonlinear element includes a Josephson junction, the amplifier may be referred to as a Josephson traveling wave parametric amplifier (JTWPA). In JTWPA, the Josephson junction remains in a superconducting state and carries supercurrent. [0003] In use, the signal is added to a strong oscillator signal, p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03F19/00
CPCH03F19/00H01P3/003H03F7/00H10N60/12H10N60/0912H03F7/04H03G3/00
Inventor 维萨·维斯特林朱哈·哈塞尔
Owner TEKNOLOGIAN TUTKIMUSKESKUS VTT
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