Related papers: A near-quantum-limited diamond maser amplifier operating at millikelvin temperatures

A near-quantum-limited diamond maser amplifier operating at millikelvin temperatures

URL: http://arxiv.org/abs/2505.05705v1
Date: Fri, 09 May 2025 00:45:08 GMT
Title: A near-quantum-limited diamond maser amplifier operating at millikelvin temperatures
Authors: Morihiro Ohta, Ching-Ping Lee, Vincent P. M. Sietses, Ivan Kostylev, Jason R. Ball, Petr Moroshkin, Tatsuki Hamamoto, Yutaka Kobayashi, Shinobu Onoda, Takeshi Ohshima, Junichi Isoya, Hiroki Takahashi, Yuimaru Kubo,
Abstract summary: Microwave quantum technologies require amplification of weak signals with minimal added noise at millikelvin temperatures.<n>In this work, we demonstrate an ultra-low-noise maser amplifier utilizing impurity spins in diamond at millikelvin temperatures.
Score: 0.0
License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Abstract: Microwave quantum technologies require amplification of weak signals with minimal added noise at millikelvin temperatures. This stringent demand has been met with superconducting parametric amplifiers. While masers offer another fundamental approach, their dependence on cryogenic operation has historically posed challenges for classical communication technologies -- a barrier that does not apply to microwave quantum technologies. In this work, we demonstrate an ultra-low-noise maser amplifier utilizing impurity spins in diamond at millikelvin temperatures. We achieve power gains exceeding $\mathrm{30\,dB}$, a minimum noise temperature of $\mathrm{0.86\,K}$ (corresponding to $2.2$ noise photons), and a maximum $\mathrm{1\,\text{dB}}$ output compression point of $\mathrm{-63\,dBm}$ at $\mathrm{6.595\,\text{GHz}}$. Our results establish masers as viable components of microwave quantum technologies.

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