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Updated: Aug 18, 2025

Gradient Echo Quantum Memory in Warm Atomic Vapor
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Diamond-based microwave quantum amplifier.

Alexander Sherman1, Oleg Zgadzai1, Boaz Koren1

  • 1Schulich Faculty of Chemistry, Technion-Israel Institute of Technology, Haifa 3200003, Israel.

Science Advances
|December 8, 2022
PubMed
Summary
This summary is machine-generated.

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We developed a novel quantum microwave amplifier using electron spins in diamond. This amplifier achieves quantum-limited noise performance at temperatures above liquid nitrogen, overcoming limitations of existing technologies.

Area of Science:

  • Quantum engineering
  • Solid-state physics
  • Microwave technology

Background:

  • Low-noise microwave amplification is crucial for science and technology.
  • Current quantum amplifiers (superconducting circuits) require millikelvin temperatures.
  • Natural quantum systems offer amplification but with higher noise above 1 K.

Purpose of the Study:

  • To demonstrate a quantum microwave amplifier using electron spins in diamond.
  • To achieve quantum-limited noise performance at higher operating temperatures.
  • To explore new possibilities for quantum science and technology.

Main Methods:

  • Utilizing electron spins in diamond as the active medium for amplification.
  • Designing and fabricating a quantum microwave amplifier device.

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  • Characterizing amplifier performance including gain, bandwidth, saturation power, and noise.

    • Main Results:

    • Demonstrated a functional quantum microwave amplifier based on diamond electron spins.
    • Achieved quantum-limited internal noise levels.
    • Operated the amplifier effectively above liquid nitrogen temperatures (~77 K).

    Conclusions:

    • Electron spins in diamond offer a promising platform for high-performance quantum microwave amplifiers.
    • This technology enables quantum applications at more accessible temperatures.
    • Opens doors for advancements in quantum science, engineering, and physics.