Continuous-variable two-dimensional cluster states at microwave frequencies
ORAL
Abstract
We demonstrate the experimental realization of two-dimensional, continuous variable (CV) cluster states between ~102 modes of a microwave frequency comb. This result is obtained by injecting vacuum fluctuations properly thermalized at 10 mK into a Josephson Parametric Amplifier parametrically pumped by a sum of coherent signals around double the center-comb frequency. This enables frequency mixing and two-mode squeezing between different frequency modes. By carefully tuning pump frequencies, amplitudes, and phases we can engineer the interference between mixing products and realize square-ladder, honeycomb and square lattice CV cluster states with three and four pump tones respectively. We prove the presence of a cluster state with a suitable nullifier test, reaching up to 1 dB of squeezing of the cluster state’s nullifiers.
*This work was partially supported by the Knut and Alice Wallenberg Foundation through the Wallenberg Center for Quantum Technology (WACQT).
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Publication:Lingua, F., Rivera Hernández, J. C., Cortinovis, M., & Haviland, D. B. (2025). Continuous-variable square-ladder cluster states in a microwave frequency comb. Phys. Rev. Lett., 134, 183602. https://doi.org/10.1103/PhysRevLett.134.183602
Bock, C. L., Rivera Hernández, J. C., Lingua, F., & Haviland, D. B. (2025). Nonreciprocal scattering in a microwave frequency comb. Phys. Rev. Applied, 24, 014027. https://doi.org/10.1103/kz53-dryz
Rivera Hernández, J. C., Lingua, F., Jolin, S. W., & Haviland, D. B. (2024). Control of multi-modal scattering in a microwave frequency comb. APL Quantum 1, 036101. https://doi.org/10.1063/5.0203426
