Florian Blanchet
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View article: Multiplexed readout of Superconductor--Normal-Conductor--Superconductor bolometers
Multiplexed readout of Superconductor--Normal-Conductor--Superconductor bolometers Open
Recently, ultrasensitive calorimeters have been proposed as a resource-efficient solution for multiplexed qubit readout in superconducting large-scale quantum processors. However, experiments demonstrating frequency multiplexing of these s…
View article: Influence of bias voltage noise on the Inelastic Cooper-Pair Tunneling Amplifier (ICTA)
Influence of bias voltage noise on the Inelastic Cooper-Pair Tunneling Amplifier (ICTA) Open
We experimentally show that the Inelastic Cooper-Pair Tunneling Amplifier (ICTA), implementing a DC-powered parametric amplification scheme, can achieve gain and noise performance similar to that of Josephson parametric amplifiers. Using e…
View article: Microwave Photon-Number Amplification
Microwave Photon-Number Amplification Open
We experimentally demonstrate a microwave photon-multiplication scheme which combines the advantages of a single-photon detector and a power meter by multiplying the incoming photon number by an integer factor. Our first experimental imple…
View article: Microwave photon-number amplification
Microwave photon-number amplification Open
So far, quantum-limited power meters are not available in the microwave domain, hindering measurement of photon number in itinerant quantum states. On the one hand, single photon detectors accurately detect single photons, but saturate as …
View article: Absorptive filters for quantum circuits: Efficient fabrication and cryogenic power handling
Absorptive filters for quantum circuits: Efficient fabrication and cryogenic power handling Open
We present an efficient fabrication method for absorptive microwave filters based on Eccosorb CR-124. Filters are fabricated from readily available parts, and their cutoff frequency can be set by their length. They exhibit desirable proper…
View article: Absorptive filters for quantum circuits: Efficient fabrication and cryogenic power handling
Absorptive filters for quantum circuits: Efficient fabrication and cryogenic power handling Open
We present an efficient fabrication method for absorptive microwave filters based on Eccosorb CR-124. Filters are fabricated from readily available parts and their cut-off frequency can be set by their length. They exhibit desirable proper…
View article: Radio-Frequency Coulomb-Blockade Thermometry
Radio-Frequency Coulomb-Blockade Thermometry Open
We present a scheme and demonstrate measurements of a Coulomb blockade thermometer (CBT) in a microwave transmission setup. The sensor is embedded in an $LCR$ resonator, where $R$ is determined by the conductance of the junction array of t…
View article: Coulomb Blockade Thermometry on a Wide Temperature Range
Coulomb Blockade Thermometry on a Wide Temperature Range Open
The Coulomb Blockade Thermometer (CBT) is a primary thermometer for cryogenic\ntemperatures, with demonstrated operation from below 1 mK up to 60 K. Its\nperformance as a primary thermometer has been verified at temperatures from 20\nmK to…
View article: Quantum critical scaling of the conductivity tensor at the metal-insulator transition in Nb$_{1-x}$Ti$_{x}$N
Quantum critical scaling of the conductivity tensor at the metal-insulator transition in Nb$_{1-x}$Ti$_{x}$N Open
In contrast to the Landau paradigm, a metal-insulator transition (MIT), driven purely by competition between itinerance and localization and unaccompanied by any conventional (e.g, magnetic) order-disorder instabilities, admits no obvious …
View article: Photonique Josephson : génération & amplification micro-ondes en régime quantique
Photonique Josephson : génération & amplification micro-ondes en régime quantique Open
The recent field of Josephson photonics is about the interplay between circuit quantum electrodynamic and dynamical Coulomb blockade. It explains and studies the ability of a Cooper pair to inelasticity tunnel through a DC-biased Josephson…
View article: Josephson photonics : microwave generation & amplification in the quantum regime
Josephson photonics : microwave generation & amplification in the quantum regime Open
La photonique Josephson est un domaine récent de la physique à la croisée entre l’électrodynamique quantique en circuit et le blocage de Coulomb dynamique. Elle explique et étudie la possibilité pour une paire de Cooper de traverser une jo…
View article: Microwave response and electrical transport studies of disordered s wave superconductor: NbN thin films
Microwave response and electrical transport studies of disordered s wave superconductor: NbN thin films Open
It is now well known that the properties of the disordered s wave superconductors can deviate significantly from the prediction of standard Bardeen-Cooper-Schrieffer (BCS) theory. By measuring the temperature dependence of the resonance fr…
View article: Superconducting properties of NbTiN thin films deposited by high-temperature chemical vapor deposition
Superconducting properties of NbTiN thin films deposited by high-temperature chemical vapor deposition Open
We report on the superconducting properties of Nb$_{1-x}$Ti$_x$N thin films of thickness $\sim$ 10 nm, with different Ti fraction $x$ in the range $ 0 \leq x \leq 0.5$, deposited by high temperature chemical vapor deposition. In this param…
View article: Multiplying and detecting propagating microwave photons using inelastic Cooper-pair tunneling
Multiplying and detecting propagating microwave photons using inelastic Cooper-pair tunneling Open
The interaction between propagating microwave fields and Cooper-pair tunneling across a DC-voltage-biased Josephson junction can be highly nonlinear. We show theoretically that this nonlinearity can be used to convert an incoming single mi…
View article: Superconducting properties of very high quality NbN thin films grown by high temperature chemical vapor deposition
Superconducting properties of very high quality NbN thin films grown by high temperature chemical vapor deposition Open
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