Scattering coefficients of superconducting microwave resonators. II. System-bath approach

Chen, Qiming; Partanen, Matti; Fesquet, Florian; Honasoge, Kedar; Kronowetter, Fabian; Nojiri, Yuki; Renger, Michael; Fedorov, Kirill G.; Marx, Achim; Deppe, Frank; Gross, Rudolf

doi:10.1103/physrevb.106.214506

Cited by 4 publications

(2 citation statements)

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“…We assume that the system-bath interaction is a combination of a photon-preserving interaction and an optomechanical-like interaction , where κ F and κ φ are the corresponding coupling strengths. Following the input-output analysis and neglecting the two-photon process 37 , we see that can be neglected if the input field is close-to-resonance with the system. It indicates that a single flux line can be simultaneously used for DC bias and RF drive 38 (See Supplementary Note 1) .…”

Section: Methodsmentioning

confidence: 99%

Quantum behavior of the Duffing oscillator at the dissipative phase transition

et al. 2023

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The non-deterministic behavior of the Duffing oscillator is classically attributed to the coexistence of two steady states in a double-well potential. However, this interpretation fails in the quantum-mechanical perspective which predicts a single unique steady state. Here, we measure the non-equilibrium dynamics of a superconducting Duffing oscillator and experimentally reconcile the classical and quantum descriptions as indicated by the Liouvillian spectral theory. We demonstrate that the two classically regarded steady states are in fact quantum metastable states. They have a remarkably long lifetime but must eventually relax into the single unique steady state allowed by quantum mechanics. By engineering their lifetime, we observe a first-order dissipative phase transition and reveal the two distinct phases by quantum state tomography. Our results reveal a smooth quantum state evolution behind a sudden dissipative phase transition and form an essential step towards understanding the intriguing phenomena in driven-dissipative systems.

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Section: Methodsmentioning

confidence: 99%

Quantum behavior of the Duffing oscillator at the dissipative phase transition

et al. 2023

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“…) Following the same formalism as in Refs. [32,54], we make use of the input-output relation of Eq. (B7) to link the transmitted field â2,out to the input fields.…”

Section: Scattering Parameters Estimationmentioning

confidence: 99%

Three-wave-mixing quantum-limited kinetic inductance parametric amplifier operating at 6 T near 1 K

Frasca,

Roy,

Beaulieu

et al. 2024

Phys. Rev. Applied

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Parametric amplifiers play a crucial role in modern quantum technology by enabling the enhancement of weak signals with minimal added noise. Traditionally, Josephson junctions have been the primary choice for constructing parametric amplifiers. Nevertheless, high-kinetic inductance thin films have emerged as viable alternatives to engineer the necessary nonlinearity. In this work, we introduce and characterize a kinetic inductance parametric amplifier (KIPA) built using high-quality NbN superconducting thin films. The KIPA addresses some of the limitations of traditional Josephson-based parametric amplifiers, excelling in dynamic range, operational temperature, and magnetic field resilience. We demonstrate a quantum-limited amplification (>20 dB) with a 20-MHz gain-bandwidth product, operational at fields up to 6 T and temperatures as high as 850 mK. Harnessing kinetic inductance in NbN thin films, the KIPA emerges as a robust solution for quantum signal amplification, enhancing research possibilities in quantum information processing and low-temperature quantum experiments. Its magnetic field compatibility and quantum-limited performance at high temperatures make it an invaluable tool, promising advancements in quantum research.

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