From coherent to fermionized microwave photons in a superconducting transmission line

• URL: http://arxiv.org/abs/2601.07659v1
• Date: Mon, 12 Jan 2026 15:40:07 GMT
• Title: From coherent to fermionized microwave photons in a superconducting transmission line
• Abstract summary: We investigate superconducting transmission lines as a novel platform for realizing a quantum fluid of microwave photons in a propagating geometry.<n>We predict that the strong photon-photon interactions provided by the intrinsic nonlinearity of Josephson junctions are sufficient to enter a regime of strongly interacting photons for realistic parameters.<n>A suitable tapering of the transmission line parameters allows for the adiabatic conversion of an incident coherent field into a Tonks-Girardeau gas of fermionized photons close to its ground state.
• Score: 0.0
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: We investigate superconducting transmission lines as a novel platform for realizing a quantum fluid of microwave photons in a propagating geometry. We predict that the strong photon-photon interactions provided by the intrinsic nonlinearity of Josephson junctions are sufficient to enter a regime of strongly interacting photons for realistic parameters. A suitable tapering of the transmission line parameters allows for the adiabatic conversion of an incident coherent field into a Tonks-Girardeau gas of fermionized photons close to its ground state. Signatures of the strong correlations are anticipated in the correlation properties of the transmitted light.

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