M. Malnou
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View article: A Traveling-Wave Parametric Amplifier and Converter
A Traveling-Wave Parametric Amplifier and Converter Open
High-fidelity qubit measurement is a critical element of all quantum computing architectures. In superconducting systems, qubits are typically measured by probing a readout resonator with a weak microwave tone which must be amplified befor…
View article: Low-noise cryogenic microwave amplifier characterization with a calibrated noise source
Low-noise cryogenic microwave amplifier characterization with a calibrated noise source Open
Parametric amplifiers have become a workhorse in superconducting quantum computing; however, research and development of these devices has been hampered by inconsistent and, sometimes, misleading noise performance characterization methodol…
View article: Low-noise cryogenic microwave amplifier characterization with a calibrated noise source
Low-noise cryogenic microwave amplifier characterization with a calibrated noise source Open
Parametric amplifiers have become a workhorse in superconducting quantum computing, however research and development of these devices has been hampered by inconsistent, and sometimes misleading noise performance characterization methodolog…
View article: Improved microwave SQUID multiplexer readout using a kinetic-inductance traveling-wave parametric amplifier
Improved microwave SQUID multiplexer readout using a kinetic-inductance traveling-wave parametric amplifier Open
We report on the use of a kinetic-inductance traveling-wave parametric amplifier (KITWPA) as the first amplifier in the readout chain of a microwave superconducting quantum interference device (SQUID) multiplexer (μmux). This μmux is desig…
View article: New results from HAYSTAC’s phase II operation with a squeezed state receiver
New results from HAYSTAC’s phase II operation with a squeezed state receiver Open
A search for dark matter axions with masses $>10\text{ }\text{ }\mathrm{\ensuremath{\mu}}\mathrm{eV}/{\mathrm{c}}^{2}$ has been performed using the HAYSTAC experiment's squeezed state receiver to achieve subquantum limited noise. This work…
View article: Accelerated Weak Signal Search Using Mode Entanglement and State Swapping
Accelerated Weak Signal Search Using Mode Entanglement and State Swapping Open
Quantum fluctuations constitute the primary noise barrier limiting\ncavity-based axion dark matter searches. In an experiment designed to mimic a\nreal axion search, we employ a quantum-enhanced sensing technique to detect a\nsynthetic axi…
View article: Characterization of NbTiN Films With Thicknesses Below 20 nm for Low Power Kinetic Inductance Amplifiers
Characterization of NbTiN Films With Thicknesses Below 20 nm for Low Power Kinetic Inductance Amplifiers Open
A quantum-limited amplification chain is a fundamental advantage for any application that may benefit from the detection of very faint signals. Reading out arrays of superconducting detectors (TESs or MKIDs), resonant cavities, or qubits, …
View article: Performance of a Kinetic Inductance Traveling-Wave Parametric Amplifier at 4 Kelvin: Toward an Alternative to Semiconductor Amplifiers
Performance of a Kinetic Inductance Traveling-Wave Parametric Amplifier at 4 Kelvin: Toward an Alternative to Semiconductor Amplifiers Open
Most microwave readout architectures in quantum computing or sensing rely on a semiconductor amplifier at 4 K, typically a high-electron mobility transistor (HEMT). Despite its remarkable noise performance, a conventional HEMT dissipates s…
View article: Efficient and Low-Backaction Quantum Measurement Using a Chip-Scale Detector
Efficient and Low-Backaction Quantum Measurement Using a Chip-Scale Detector Open
Superconducting qubits are a leading platform for scalable quantum computing and quantum error correction. One feature of this platform is the ability to perform projective measurements orders of magnitude more quickly than qubit decoheren…
View article: Sub-Kelvin Thermometer for On-Chip Measurements of Microwave Devices Utilizing Two-Level Systems in Superconducting Microresonators
Sub-Kelvin Thermometer for On-Chip Measurements of Microwave Devices Utilizing Two-Level Systems in Superconducting Microresonators Open
We present a superconducting microresonator thermometer based on two-level systems (TLS) that is drop-in compatible with cryogenic microwave systems. The operational temperature range is 50-1000~mK (which may be extended to 5~mK), and the …
View article: Erratum: Squeezed Vacuum Used to Accelerate the Search for a Weak Classical Signal [Phys. Rev. X <b>9</b>, 021023 (2019)]
Erratum: Squeezed Vacuum Used to Accelerate the Search for a Weak Classical Signal [Phys. Rev. X <b>9</b>, 021023 (2019)] Open
Received 7 August 2020DOI:https://doi.org/10.1103/PhysRevX.10.039902Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain a…
View article: Efficient and Low-Backaction Quantum Measurement Using a Chip-Scale Detector
Efficient and Low-Backaction Quantum Measurement Using a Chip-Scale Detector Open
Superconducting qubits are a leading platform for scalable quantum computing and quantum error correction. One feature of this platform is the ability to perform projective measurements orders of magnitude more quickly than qubit decoheren…
View article: Improved analysis framework for axion dark matter searches
Improved analysis framework for axion dark matter searches Open
In experiments searching for axionic dark matter, the use of the standard\nthreshold-based data analysis discards valuable information. We present a\nBayesian analysis framework that builds on an existing processing protocol to\nextract mo…
View article: Ultrastable millimeter-wave kinetic inductance detectors
Ultrastable millimeter-wave kinetic inductance detectors Open
We demonstrate microwave kinetic inductance detectors (MKIDs) whose sensitivity is limited by photon noise at signal frequencies as low as 50 mHz. The subhertz part of the detection spectrum is important for contemporary millimeter-wave sc…
View article: Results from phase 1 of the HAYSTAC microwave cavity axion experiment
Results from phase 1 of the HAYSTAC microwave cavity axion experiment Open
We report on the results from a search for dark matter axions with the HAYSTAC experiment using a microwave cavity detector at frequencies between 5.6 and 5.8 GHz. We exclude axion models with two photon coupling gaγγ≳2×10-14 GeV-1, a fact…
View article: HTS Josephson junctions arrays for high-frequency mixing
HTS Josephson junctions arrays for high-frequency mixing Open
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View article: Ion-irradiated YBa$_2$Cu$_3$O$_7$ Josephson arrays
Ion-irradiated YBa$_2$Cu$_3$O$_7$ Josephson arrays Open
We designed, fabricated and tested short one dimensional arrays of masked ion-irradiated YBa$_2$Cu$_3$O$_7$ Josephson junctions (JJ) embedded into log-periodic spiral antennas. Our arrays consist of 4 or 8 junctions separated either by 960…
View article: Ion irradiated YBa2Cu3O7 nano-meanders for superconducting single photon detectors
Ion irradiated YBa2Cu3O7 nano-meanders for superconducting single photon detectors Open
We report the fabrication of few hundred microns long, hundreds of nanometers wide and 30 nm thick meanders made from YBa2CU3O7. Thin films protected by a 8 nm-thick Ce02 cap layer have been patterned by high energy (a few tens of keV) oxy…