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Dark Matter Axion Search with HAYSTAC Phase II

https://doi.org/10.1103/PhysRevLett.134.151006

Bai, Xiran; Jewell, M J; Echevers, J; van_Bibber, K; Droster, A; Esmat, Maryam H; Ghosh, Sumita; Graham, Eleanor; Jackson, H; Laffan, Claire; et al (April 2025, Physical Review Letters)

This Letter reports new results from the HAYSTAC experiment’s search for dark matter axions in our galactic halo. It represents the widest search to date that utilizes squeezing to realize subquantum limited noise. The new results cover $1.71 μ eV$ of newly scanned parameter space in the mass ranges $17.28 - 18.44 μ eV$ and $18.71 - 19.46 μ eV$ . No statistically significant evidence of an axion signal was observed, excluding couplings $| g_{γ} | \geq 2.75 \times | g_{γ}^{KSVZ} |$ and $| g_{γ} | \geq 2.96 \times | g_{γ}^{KSVZ} |$ at the 90% confidence level over the respective region. By combining this data with previously published results using HAYSTAC’s squeezed state receiver, a total of $2.27 μ eV$ of parameter space has now been scanned between $16.96 - 19.46 μ eV$ $μ eV$ , excluding $| g_{γ} | \geq 2.86 \times | g_{γ}^{KSVZ} |$ at the 90% confidence level. These results demonstrate the squeezed state receiver’s ability to probe axion models over a significant mass range while achieving a scan rate enhancement relative to a quantum-limited experiment. Published by the American Physical Society2025
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Free, publicly-accessible full text available April 1, 2026
Electromagnetically-induced-transparency spectroscopy of high-lying Rydberg states in ${}^{39}K$

https://doi.org/10.1103/PhysRevA.105.042808

Zhu, Yuqi; Ghosh, Sumita; Cahn, S. B.; Jewell, M. J.; Speller, D. H.; Maruyama, Reina H. (April 2022, Physical Review A)

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New results from HAYSTAC’s phase II operation with a squeezed state receiver

https://doi.org/10.1103/PhysRevD.107.072007

Jewell, M. J.; Leder, A. F.; Backes, K. M.; Bai, Xiran; van Bibber, K.; Brubaker, B. M.; Cahn, S. B.; Droster, A.; Esmat, Maryam H.; Ghosh, Sumita; et al (April 2023, Physical Review D)

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A quantum enhanced search for dark matter axions

https://doi.org/10.1038/s41586-021-03226-7

Backes, K. M.; Palken, D. A.; Kenany, S. Al; Brubaker, B. M.; Cahn, S. B.; Droster, A.; Hilton, Gene C.; Ghosh, Sumita; Jackson, H.; Lamoreaux, S. K.; et al (February 2021, Nature)
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Improved analysis framework for axion dark matter searches

https://doi.org/10.1103/PhysRevD.101.123011

Palken, D. A.; Brubaker, B. M.; Malnou, M.; Kenany, S. Al; Backes, K. M.; Cahn, S. B.; Gurevich, Y. V.; Lamoreaux, S. K.; Lewis, S. M.; Maruyama, R. H.; et al (June 2020, Physical Review D)

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Results from phase 1 of the HAYSTAC microwave cavity axion experiment

https://doi.org/10.1103/PhysRevD.97.092001

Zhong, L.; Al Kenany, S.; Backes, K. M.; Brubaker, B. M.; Cahn, S. B.; Carosi, G.; Gurevich, Y. V.; Kindel, W. F.; Lamoreaux, S. K.; Lehnert, K. W.; et al (May 2018, Physical Review D)

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