Proximity-Coupled Al/Au Bilayer Kinetic Inductance Detectors

Hu, Jie; Salatino, Maria; Traini, Alessandro; Chaumont, Christine; Boussaha, Faouzi; Goupil, Christophe; Piat, M.

doi:10.1007/s10909-019-02313-4

Cited by 12 publications

(11 citation statements)

References 16 publications

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“…Here, large L k is desirable in transmons [1] and kinetic inductance photon detectors [2][3][4][5], whereas small L k can be useful to reduce the readout or reset times τ r = L k /R 0 in quantum memories, qubits and photon detectors, where R 0 is the resistance of the readout circuit. The influence of the proximity effect on L k is most transparent for thin-film S-N bilayers or nanowires, which have been used in single photon detectors [177][178][179].…”

Section: Tuning the Kinetic Inductance By The Proximity Effectmentioning

confidence: 99%

Tuning microwave losses in superconducting resonators

Gurevich

2023

Supercond. Sci. Technol.

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Performance of superconducting resonators, particularly cavities for particle accelerators and micro cavities and thin film resonators for quantum computations and photon detectors has been improved substantially by recent materials treatments and technological advances. As a result, the niobium cavities have reached the quality factors $Q\sim 10^{11}$ at 1-2 GHz and 1.5 K and the breakdown radio-frequency (rf) fields $H$close to the dc superheating field of the Meissner state. These advances raise the question whether the state-of-the-art cavities are close to the fundamental limits, what these limits actually are, and to what extent the $Q$ and $H$ limits can be pushed by the materials nano structuring and impurity management. These issues are also relevant to many applications using high-Q thin film resonators, including single-photon detectors and quantum circuits. This topical review outlines basic physical mechanisms of the rf nonlinear surface impedance controlled by quasiparticles, dielectric losses and trapped vortices, as well as the dynamic field limit of the Meissner state. Sections cover ways of engineering an optimum quasiparticle density of states and superfluid density to reduce rf losses and kinetic inductance by pairbreaking mechanisms related to magnetic impurities, rf currents, and proximity-coupled metallic layers at the surface. A section focuses on mechanisms of residual surface resistance which dominates rf losses at ultra low temperatures. Microwave losses of trapped vortices and their reduction by optimizing the concentration of impurities and pinning potential are also discussed.

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Section: Tuning the Kinetic Inductance By The Proximity Effectmentioning

confidence: 99%

Tuning microwave losses in superconducting resonators

Gurevich

2023

Supercond. Sci. Technol.

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“…SMA connectors in a gold-plated copper box and is cooled down in an Adiabatic Demagnetization Refrigerator (ADR) at APC [10]. The first characterization were done in the dark at temperatures ranging from 50 mK to 500 mK and readout powers ranging from -105 dBm to -65 dBm.…”

Section: Preliminary Characterizationsmentioning

confidence: 99%

Investigation of Optical Coupling in Microwave Kinetic Inductance Detectors Using Superconducting Reflective Plates

Nicaise

Martin

et al. 2022

J Low Temp Phys

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To improve the optical coupling in Microwave Kinetic Inductance Detectors (MKIDs), we investigate the use of a reflective plate beneath the meandered absorber. We designed, fabricated and characterized high-Q factors TiN-based MKIDs on sapphire operating at optical wavelengths with a Au/Nb reflective thin bilayer below the meander. The reflector is set at a quarter-wave distance from the meander using a transparent Al 2 O 3 dielectric layer to reach the peak photon absorption. We expect the plate to recover undetected photons by reflecting them back onto the absorber.

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“…Our mm-MKID design is based on the one developed for the NIKA experiment [13] (figure 1 right). It has 25 pixels with resonant frequencies in the range of 1.8-2 GHz with coupling quality factor of 8000, made from 30 nm aluminium thin film on 250 nm silicon substrate [14]. Our optical-MKID (figure 1 left) is also 25 pixels, but with resonant frequencies in the range of 2-2.2 GHz with coupling quality factor of 10000 made from 60nm TiN thin film over 250 nm silicon substrate.…”

Section: Mkids Devices and Experimental Setupmentioning

confidence: 99%

A readout system for microwave kinetic inductance detectors using software defined radios

et al. 2021

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Microwave kinetic inductance detectors (MKIDs) are typically readout using custom high-speed electronics and firmware, a challenging and time-intensive undertaking. We have developed a readout system for these devices using a software defined radio (SDR), a software implementation of radiofrequency signal processing. The SDR allows use of pre-existing software libraries and minimizes specialized firmware coding, a significant reduction in effort. We customized our SDR to readout mm and optical band MKIDs with resonant frequencies of 1.8-2 GHz and 2-2.2 GHz respectively. We used this readout system to measure the sensitivity of our MKIDs devices to visible light. We show that SDRs are a good candidate for small pixel count MKIDs readout systems, and make recommendations for readout systems for larger Pixel count arrays.

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Proximity-Coupled Al/Au Bilayer Kinetic Inductance Detectors

Cited by 12 publications

References 16 publications

Tuning microwave losses in superconducting resonators

Tuning microwave losses in superconducting resonators

Investigation of Optical Coupling in Microwave Kinetic Inductance Detectors Using Superconducting Reflective Plates

A readout system for microwave kinetic inductance detectors using software defined radios

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