Near-ultrastrong nonlinear light-matter coupling in superconducting circuits

Yufeng Ye, Jeremy B. Kline, Alec Yen, Gregory Cunningham, Max Tan, Alicia Zang, Michael Gingras, Bethany M. Niedzielski, Hannah Stickler, Kyle Serniak, Mollie E. Schwartz and Kevin P. O’Brien ()
Additional contact information
Yufeng Ye: Massachusetts Institute of Technology
Jeremy B. Kline: Massachusetts Institute of Technology
Alec Yen: Massachusetts Institute of Technology
Gregory Cunningham: Massachusetts Institute of Technology
Max Tan: Massachusetts Institute of Technology
Alicia Zang: Massachusetts Institute of Technology
Michael Gingras: Massachusetts Institute of Technology
Bethany M. Niedzielski: Massachusetts Institute of Technology
Hannah Stickler: Massachusetts Institute of Technology
Kyle Serniak: Massachusetts Institute of Technology
Mollie E. Schwartz: Massachusetts Institute of Technology
Kevin P. O’Brien: Massachusetts Institute of Technology

Nature Communications, 2025, vol. 16, issue 1, 1-8

Abstract: Abstract Light-matter interaction between an atom and an electromagnetic resonator is ubiquitous in quantum technologies. Although linear light-matter coupling $$g{\hat{\sigma }}_{x}(\hat{a}+{\hat{a}}^{{{\dagger}} })$$ g σ ̂ x ( a ̂ + a ̂ † ) can reach the ultrastrong regime g/ω > 10−1, nonlinear light-matter coupling $$\frac{\chi }{2}{\hat{\sigma }}_{z}{\hat{a}}^{{{\dagger}} }\hat{a}$$ χ 2 σ ̂ z a ̂ † a ̂ is typically perturbative and limited to χ/ω

Date: 2025
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DOI: 10.1038/s41467-025-59152-z

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