Spectral signature of high-order photon processes enhanced by Cooper-pair pairing
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arXiv
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| Main Authors: | , , , , , , , , , |
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| Format: | Preprint |
| Published: |
2023
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| _version_ | 1866915895661559808 |
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| author | Smith, W. C. Borgognoni, A. Villiers, M. Roverc'h, E. Palomo, J. Delbecq, M. R. Kontos, T. Campagne-Ibarcq, P. Douçot, B. Leghtas, Z. |
| author_facet | Smith, W. C. Borgognoni, A. Villiers, M. Roverc'h, E. Palomo, J. Delbecq, M. R. Kontos, T. Campagne-Ibarcq, P. Douçot, B. Leghtas, Z. |
| contents | Inducing interactions between individual photons is key for photonic quantum information and studying many-body photon states. Superconducting circuits are well suited to combine strong interactions with low losses. Typically, microwave photons are stored in an $LC$ oscillator shunted by a Josephson junction, where the zero-point phase fluctuations across the junction determine the strength and order of photon interactions. Most superconducting nonlinear oscillators operate with small phase fluctuations, where two-photon Kerr interactions dominate. In our experiment, we shunt a high-impedance $LC$ oscillator with a dipole element favoring the tunneling of paired Cooper pairs. This leads to large phase fluctuations of 3.4, accessing a regime where transition frequencies shift non-monotonically with excitation number. From spectroscopy, we extract two-, three-, and four-photon interaction energies, all of similar strength and exceeding the photon loss rate. Our results open a new regime of high-order photon interactions in microwave quantum optics. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2312_15075 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Spectral signature of high-order photon processes enhanced by Cooper-pair pairing Smith, W. C. Borgognoni, A. Villiers, M. Roverc'h, E. Palomo, J. Delbecq, M. R. Kontos, T. Campagne-Ibarcq, P. Douçot, B. Leghtas, Z. Quantum Physics Inducing interactions between individual photons is key for photonic quantum information and studying many-body photon states. Superconducting circuits are well suited to combine strong interactions with low losses. Typically, microwave photons are stored in an $LC$ oscillator shunted by a Josephson junction, where the zero-point phase fluctuations across the junction determine the strength and order of photon interactions. Most superconducting nonlinear oscillators operate with small phase fluctuations, where two-photon Kerr interactions dominate. In our experiment, we shunt a high-impedance $LC$ oscillator with a dipole element favoring the tunneling of paired Cooper pairs. This leads to large phase fluctuations of 3.4, accessing a regime where transition frequencies shift non-monotonically with excitation number. From spectroscopy, we extract two-, three-, and four-photon interaction energies, all of similar strength and exceeding the photon loss rate. Our results open a new regime of high-order photon interactions in microwave quantum optics. |
| title | Spectral signature of high-order photon processes enhanced by Cooper-pair pairing |
| topic | Quantum Physics |
| url | https://arxiv.org/abs/2312.15075 |