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| Main Authors: | , , , , , , , , , |
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| Format: | Preprint |
| Published: |
2026
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2602.13563 |
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| _version_ | 1866912904327987200 |
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| author | Yanik, Kagan Huang, Irwin Bhandari, Bibek Qing, Bingcheng Hajr, Ahmed Wang, Ke Santiago, David I. Siddiqi, Irfan Dressel, Justin Jordan, Andrew N. |
| author_facet | Yanik, Kagan Huang, Irwin Bhandari, Bibek Qing, Bingcheng Hajr, Ahmed Wang, Ke Santiago, David I. Siddiqi, Irfan Dressel, Justin Jordan, Andrew N. |
| contents | We propose a flux-pumped superconducting parametric amplifier based on symmetrically threaded superconducting quantum interference devices (SQUIDs) that achieves a Kerr-free operating point under suitable drive conditions. Eliminating the Kerr nonlinearity is advantageous for quantum-limited amplification, as it mitigates unwanted distortions in squeezing and prevents degradation of both gain and quantum efficiency in the high-gain strong drive regime. By replacing the central junction in the symmetrically threaded SQUIDs (STS) configuration with a linear inductor, we find that the Kerr-nonlinearity can be eliminated and the effective Hamiltonian reduces to that of a degenerate parametric amplifier (DPA), up to higher-order corrections in the zero-point fluctuations of the superconducting phase operator. We show that the deviations from ideal DPA behavior introduced by these higher-order terms are significantly weaker than those associated with a Kerr nonlinearity. Consequently, the STS design can be driven strongly while maintaining near-quantum-limited performance at the Kerr-free point. Our analysis predicts phase-preserving gain and efficiency approaching the quantum limit, with robust operation demonstrated up to 25 dB of gain. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2602_13563 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Flux Pumped Kerr-Free Parametric Amplifier Yanik, Kagan Huang, Irwin Bhandari, Bibek Qing, Bingcheng Hajr, Ahmed Wang, Ke Santiago, David I. Siddiqi, Irfan Dressel, Justin Jordan, Andrew N. Quantum Physics We propose a flux-pumped superconducting parametric amplifier based on symmetrically threaded superconducting quantum interference devices (SQUIDs) that achieves a Kerr-free operating point under suitable drive conditions. Eliminating the Kerr nonlinearity is advantageous for quantum-limited amplification, as it mitigates unwanted distortions in squeezing and prevents degradation of both gain and quantum efficiency in the high-gain strong drive regime. By replacing the central junction in the symmetrically threaded SQUIDs (STS) configuration with a linear inductor, we find that the Kerr-nonlinearity can be eliminated and the effective Hamiltonian reduces to that of a degenerate parametric amplifier (DPA), up to higher-order corrections in the zero-point fluctuations of the superconducting phase operator. We show that the deviations from ideal DPA behavior introduced by these higher-order terms are significantly weaker than those associated with a Kerr nonlinearity. Consequently, the STS design can be driven strongly while maintaining near-quantum-limited performance at the Kerr-free point. Our analysis predicts phase-preserving gain and efficiency approaching the quantum limit, with robust operation demonstrated up to 25 dB of gain. |
| title | Flux Pumped Kerr-Free Parametric Amplifier |
| topic | Quantum Physics |
| url | https://arxiv.org/abs/2602.13563 |