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Broadband Microwave Isolation via Adiabatic Mode Conversion in Superconducting Coupled Transmission Lines

Mahdi Naghiloo, Kaidong Peng, Yufeng Ye +2 more

Bulletin of the American Physical SocietyMar 17, 20210 citations

Broadband Microwave Isolation with Adiabatic Mode Conversion in Coupled Superconducting Transmission Lines

Mahdi Naghiloo, Kaidong Peng, Yufeng Ye +2 more

We propose a traveling wave scheme for broadband microwave isolation using parametric mode conversion in conjunction with adiabatic phase matching technique in a pair of coupled nonlinear transmission lines. This scheme is compatible with the circuit quantum electrodynamics architecture (cQED) and provides isolation without introducing additional quantum noise. We first present the scheme in a general setting then propose an implementation with Josephson junction transmission lines. Numerical simulation shows more than 20 dB isolation over an octave bandwidth (4-8\,GHz) in a 2000 unit cell device with less than 0.05 dB insertion loss dominated by dielectric loss.We propose a traveling wave scheme for broadband microwave isolation using parametric mode conversion in conjunction with adiabatic phase matching technique in a pair of coupled nonlinear transmission lines. This scheme is compatible with the circuit quantum electrodynamics architecture (cQED) and provides isolation without introducing additional quantum noise. We first present the scheme in a general setting then propose an implementation with Josephson junction transmission lines. Numerical simulation shows more than 20 dB isolation over an octave bandwidth (4-8\,GHz) in a 2000 unit cell device with less than 0.05 dB insertion loss dominated by dielectric loss.

arXiv:2103.07793Mar 13, 20212 citations

Study of Coupling in Superconducting Transmission Lines

D. Valenzuela

Journal of Superconductivity and Novel MagnetismFeb 9, 20240 citations

From coherent to fermionized microwave photons in a superconducting transmission line

Alberto Tabarelli de Fatis, Stephanie Matern, Gianluca Rastelli +1 more

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.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.

cond-mat.quant-gasCross-listedarXiv:2601.07659Jan 13, 20260 citations

Mediating interactions between superconducting microwave cavities with three-wave mixing, part 1

Stijn J. de Graaf, Benjamin J. Chapman, Yaxing Zhang +9 more

Bulletin of the American Physical SocietyMar 5, 20200 citations

Wideband Isolation by Frequency Conversion in a Josephson-Junction Transmission Line

Leonardo Ranzani, Shlomi Kotler, Adam J. Sirois +5 more

When making a quantum measurement, one must be careful not to disturb the system. Nonreciprocal elements called isolators allow microwave signals to propagate in one direction but not the reverse, and so can mitigate disturbance, but commercial isolators require strong permanent magnets that cannot be placed close to superconducting amplifiers or qubits. To this end, the authors demonstrate a microwave isolator with directionality provided by a strong, traveling ``pump'' wave. Its simple construction and large bandwidth afford this isolator integrability with existing superconducting quantum hardware.When making a quantum measurement, one must be careful not to disturb the system. Nonreciprocal elements called isolators allow microwave signals to propagate in one direction but not the reverse, and so can mitigate disturbance, but commercial isolators require strong permanent magnets that cannot be placed close to superconducting amplifiers or qubits. To this end, the authors demonstrate a microwave isolator with directionality provided by a strong, traveling ``pump'' wave. Its simple construction and large bandwidth afford this isolator integrability with existing superconducting quantum hardware.

Physical Review AppliedNov 17, 201729 citations

Microwave Isolation through Adiabatic Mode Conversion in Superconducting Coupled Transmission Lines

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Microwave Isolation through Adiabatic Mode Conversion in Superconducting Coupled Transmission Lines

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