aiqbench analysis
This study demonstrates that in practical SNAIL Parametric Amplifiers, baseline Kerr nonlinearity is negligible and does not limit vacuum squeezing performance. Instead, achievable squeezing is primarily constrained by internal resonator and insertion losses within the microwave chain. Consequently, engineering efforts should prioritize minimizing these loss mechanisms over further suppressing Kerr effects to improve sensor and qubit-readout fidelity.
Practical Limits to Single-Mode Vacuum Squeezing with a SNAIL Parametric Amplifier
arXiv:2603.14123v4 Announce Type: replace Abstract: We characterize single-mode vacuum squeezing generated by a SNAIL Parametric Amplifier (SPA) operated under conditions representative of practical sensing and qubit-readout experiments. Motivated by prior expectations that Kerr-induced distortion limits squeezing in degenerate parametric amplifiers, we varied external flux and pump power to explore operating points where Kerr nonlinearity is theoretically minimized. We find that for practical applications where the squeezing frequency is fixed, the Kerr was variable by about a factor of two and the achievable squeezing showed no significant dependence on Kerr. Theoretical modeling supports this observation and indicates that baseline Kerr values in state-of-the-art SPAs are already too small to impose a practical limitation. Instead, squeezing was dominated by internal resonator loss and insertion loss in the microwave chain. These results indicate that, in practical SPAs, reducing loss, rather than suppressing Kerr, is the primary route to improved squeezing performance.
Abstract:We characterize single-mode vacuum squeezing generated by a SNAIL Parametric Amplifier (SPA) operated under conditions representative of practical sensing and qubit-readout experiments. Motivated by prior expectations that Kerr-induced distortion limits squeezing in degenerate parametric amplifiers, we varied external flux and pump power to explore operating points where Kerr nonlinearity is theoretically minimized. We find that for practical applications where the squeezing frequency is fixed, the Kerr was variable by about a factor of two and the achievable squeezing showed no significant dependence on Kerr. Theoretical modeling supports this observation and indicates that baseline Kerr values in state-of-the-art SPAs are already too small to impose a practical limitation. Instead, squeezing was dominated by internal resonator loss and insertion loss in the microwave chain. These results indicate that, in practical SPAs, reducing loss, rather than suppressing Kerr, is the primary route to improved squeezing performance.
arXiv:2603.14123 [quant-ph]
(or arXiv:2603.14123v4 [quant-ph] for this version)
Full text under the publisher's open licence · 151 words
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