Parametric amplification and entanglement generation in a left-handed Josephson transmission line: Theory (Part 1)
ORAL
Abstract
Boran Kuzhan1, Giulio Cappelli2, Gwenael Le Gal2, Bekim Fazliji2,3, Arpit Ranadive2, Edgar Bonet2, Eric Eyraud2, Luca Planat3, Alexis Coissard3, Nicolas Roch2,3, Archana Kamal1
1.Northwestern University, Evanston, USA
2.Univ. Grenoble Alpes, CNRS, Grenoble INP, Institut N´eel, 38000 Grenoble, France
3.Silent Waves, 38000 Grenoble, France
Left-handed (or negative-index) Josephson transmission lines are a new modality for realizing low-noise traveling-wave parametric amplifiers (TWPA). In contrast to conventional right-handed devices, four-wave mixing in a left-handed TWPA is natively phase-matched, leading to high gains over GHz bandwidths without requiring any complicated dispersion or nonlinear engineering [1]. In addition, owing to its inverted dispersion relation, left-handed TWPA supports unique operating regimes, such as (i) reversed dispersion regime that can be leveraged for achieving flat broadband gain, and (ii) counter-propagating amplification where it operates as a narrow-band high-gain amplifier. We will present a detailed theoretical comparison of both co- and counter-propagating modes of amplification in a left-handed TWPA. Interestingly, in the latter mode, both amplification gain and bandwidth become strongly dependent on effective length of the TWPA. We will also discuss how power-dependent distortions, including nonlinear phase modulation and higher-harmonic generation, are inherently suppressed in both modes of operation, making left-handed TWPA a versatile platform for both narrow-band and broadband squeezing generation.
[1] C. Kow, V. Podolskiy, A. Kamal, Phys. Rev. Applied 24 024026 (2025)
1.Northwestern University, Evanston, USA
2.Univ. Grenoble Alpes, CNRS, Grenoble INP, Institut N´eel, 38000 Grenoble, France
3.Silent Waves, 38000 Grenoble, France
Left-handed (or negative-index) Josephson transmission lines are a new modality for realizing low-noise traveling-wave parametric amplifiers (TWPA). In contrast to conventional right-handed devices, four-wave mixing in a left-handed TWPA is natively phase-matched, leading to high gains over GHz bandwidths without requiring any complicated dispersion or nonlinear engineering [1]. In addition, owing to its inverted dispersion relation, left-handed TWPA supports unique operating regimes, such as (i) reversed dispersion regime that can be leveraged for achieving flat broadband gain, and (ii) counter-propagating amplification where it operates as a narrow-band high-gain amplifier. We will present a detailed theoretical comparison of both co- and counter-propagating modes of amplification in a left-handed TWPA. Interestingly, in the latter mode, both amplification gain and bandwidth become strongly dependent on effective length of the TWPA. We will also discuss how power-dependent distortions, including nonlinear phase modulation and higher-harmonic generation, are inherently suppressed in both modes of operation, making left-handed TWPA a versatile platform for both narrow-band and broadband squeezing generation.
[1] C. Kow, V. Podolskiy, A. Kamal, Phys. Rev. Applied 24 024026 (2025)
*This work was supported by DARPA under grant HR00112420343.
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Presenters
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Boran Kuzhan
- Northwestern University, Evanston, USA
- Northwestern University