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30 GHz-voltage controlled oscillator operating at 4 K.

Arne Hollmann1, Daniel Jirovec2, Maciej Kucharski3

  • 1JARA-FIT Institute for Quantum Information, Forschungszentrum Jülich GmbH and RWTH Aachen University, D 52074 Aachen, Germany.

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Summary

This study demonstrates a silicon-germanium voltage-controlled oscillator operating effectively at cryogenic temperatures. The device shows stable performance, crucial for scalable quantum computing architectures requiring embedded microwave sources.

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Area of Science:

  • Quantum Computing
  • Cryogenic Engineering
  • Integrated Circuits

Background:

  • Scalable quantum computer architectures require millions of physical qubits.
  • Embedded microwave sources operating below 4 K are needed to address signal-line bandwidth and fan-out challenges.
  • Previous research lacked cryogenic performance data for essential components like voltage-controlled oscillators.

Purpose of the Study:

  • To investigate the cryogenic performance of a 130 nm BiCMOS based SiGe voltage-controlled oscillator (VCO).
  • To determine the VCO's frequency, output power, and noise dependence on temperature and magnetic field.
  • To assess the device's suitability for integration into quantum computing architectures.

Main Methods:

  • Low-temperature measurements of a SiGe VCO from 300 K down to 4 K.
  • Characterization of frequency and output power versus temperature and magnetic field (up to 5 T).
  • Analysis of noise performance at cryogenic temperatures.

Main Results:

  • The SiGe VCO maintained full functionality across the tested temperature range (300 K to 4 K).
  • Carrier frequency increased by 3% and output power by 10 dB at 4 K compared to 300 K.
  • Frequency tuning range remained stable at approximately 20%, with minimal frequency shift (0.02%) in a 5 T magnetic field.

Conclusions:

  • The 130 nm SiGe VCO is suitable for cryogenic operation in quantum computing applications.
  • The device exhibits robust performance under varying temperature and magnetic field conditions.
  • This work provides critical data for designing scalable quantum computer architectures with integrated control electronics.