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Nonreciprocal Microwave Signal Processing with a Field-Programmable Josephson Amplifier.

F Lecocq1, L Ranzani2, G A Peterson1

  • 1National Institute of Standards and Technology, 325 Broadway, Boulder, Colorado 80305, USA.

Physical Review Applied
|March 19, 2024
PubMed
Summary
This summary is machine-generated.

We developed a field-programmable Josephson amplifier (FPJA), a versatile superconducting circuit. This compact device enables flexible frequency conversion and amplification for quantum technologies.

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Area of Science:

  • Superconducting circuits
  • Quantum electronics
  • Microwave engineering

Background:

  • Superconducting circuits are crucial for quantum computing and sensitive measurements.
  • Existing amplifiers often lack flexibility and require complex operating conditions.

Purpose of the Study:

  • To design and implement a novel field-programmable Josephson amplifier (FPJA).
  • To demonstrate the FPJA's capability for various microwave signal processing functions.
  • To assess its performance and suitability for integration with quantum systems.

Main Methods:

  • Utilized a gradiometric superconducting quantum-interference device (SQUID) with Nb/Al-AlOx/Nb Josephson junctions.
  • Programmed the FPJA *in situ* using microwave drives.
  • Tested four distinct operational modes: frequency conversion, circulation, phase-preserving amplification, and directional phase-preserving amplification.

Main Results:

  • Achieved -0.5 dB transmission and -30 dB reflection for frequency conversion and circulation.
  • Demonstrated phase-preserving amplification with >20 dB gain and 1 photon of added noise.
  • Showcased directional phase-preserving amplification with 18 dB forward gain and 8 dB reverse isolation.
  • Observed quantitative agreement between experimental results and theoretical predictions.

Conclusions:

  • The FPJA is a compact, lossless, and programmable superconducting circuit.
  • It offers flexible reciprocal and nonreciprocal operations with high performance.
  • Its design is insensitive to flux noise and operates without magnetic shielding, facilitating on-chip integration with quantum circuits.