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Integrated and DC-powered superconducting microcomb.

Chen-Guang Wang1,2,3, Wuyue Xu1,2,3, Chong Li1,2,3

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We developed an ultra-low power, integrated superconducting microcomb using a Josephson junction. This device enables self-started mode-locking for on-chip microwave photonics and quantum processors.

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Area of Science:

  • Photonics
  • Quantum Computing
  • Superconducting Devices

Background:

  • Frequency combs are crucial for precise measurements.
  • Integrated photonics offers scalable solutions for on-chip applications.
  • Superconducting devices enable low-power, high-performance electronics.

Purpose of the Study:

  • To demonstrate a fully integrated superconducting microcomb.
  • To achieve ultra-low power consumption and simple operation.
  • To explore applications in microwave photonics and quantum computing.

Main Methods:

  • Fabrication of a superconducting microcomb device.
  • Utilizing a Josephson junction coupled to a microstrip resonator.
  • Employing self-started mode-locking for coherent comb generation.
  • Applying coherent injection-locking to narrow comb line widths.

Main Results:

  • Demonstrated a turnkey, integrated superconducting microcomb.
  • Achieved self-started mode-locking with picowatt power consumption.
  • Generated a multi-octave spanning microwave comb spectrum.
  • Narrowed comb line widths to 1 Hz using injection-locking.

Conclusions:

  • This work is a significant advancement for integrated microwave photonics.
  • The developed microcomb has potential applications in integrated quantum processors.
  • The technology offers a scalable and efficient solution for on-chip frequency comb generation.