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

• URL: http://arxiv.org/abs/2211.10403v1
• Date: Fri, 18 Nov 2022 18:03:42 GMT
• Title: Bandwidth and visibility improvement in detection of a weak signal using mode entanglement and swapping
• Authors: Yue Jiang, Elizabeth P. Ruddy, Kyle O. Quinlan, Maxime Malnou, Nicholas E. Frattini, Konrad W. Lehnert
• Abstract summary: We employ a quantum-enhanced sensing technique to detect axion-like microwave tone at an unknown frequency weakly coupled to a resonator. The speedup is achieved by dynamically coupling the resonator mode to a second (readout) mode with balanced swapping and two-mode squeezing interactions.
• Score: 3.6408288802047086
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• 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.

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