Bandwidth and visibility improvement in detection of a weak signal using mode entanglement and swapping

Abstract

Quantum fluctuations constitute the primary noise barrier limiting cavity-based axion dark matter searches. In an experiment designed to mimic a real axion search, we employ a quantum-enhanced sensing technique to detect a synthetic axion-like microwave tone at an unknown frequency weakly coupled to a resonator, demonstrating a factor of 5.6 acceleration relative to a quantum-limited search for the same tone. The acceleration comes from increases to both the visibility bandwidth and the peak visibility of a detector. This speedup is achieved by dynamically coupling the resonator mode to a second (readout) mode with balanced swapping and two-mode squeezing interactions. A small fractional imbalance between the two interaction rates yields further scan rate enhancement and we demonstrate that an 8-fold acceleration can be achieved.

9 pages, 5 figures

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Cited by in corpus (11)

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• Dark Matter Axion Search with HAYSTAC Phase II
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• Overcoming the fundamental limit of quantum transduction via intraband entanglement
• Quantum-Enhanced Dark Matter Search Using Cat States
• Cavity as Radio Telescope for Galactic Dark Photon
• Quantum-enhanced dark matter detection with in-cavity control: mitigating the Rayleigh curse
• Simultaneous Resonant and Broadband Detection of Ultralight Dark Matter and High-Frequency Gravitational Waves via Cavities and Circuits
• Cavity, lumped-circuit, and spin-based detection of axion dark matter: differences and similarities
• Emerging axion detection in artificial magnetoelectric materials