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Noise at the quantum limit (Heisenberg limit) over a large bandwidth is a fundamental requirement for challenging future applications, like neutrino mass measurement, next-generation x-ray observatory, CMB measurement, and dark matter and axion detection. The need for a quantum-limited microwave amplifier with large bandwidth operating at millikelvin temperatures is especially felt in many quantum technology applications, for example, the rapid high-fidelity multiplexed readout of superconducting qubits. To this end, DARTWARS developes devices called traveling-wave parametric amplifiers (TWPAs) where te nonlinear element of TWPAs is provided by Josephson junctions or by the kinetic inductance of a high-resistivity superconductor.
DARTWARS long-term goal is to demonstrate the readout with different sensors (TESs, MKIDs, microwave cavities, and qubits) allowing to increase the sensitivity of the next generation particle physics experiments and the quantum volume of quantum computers.
DARTWARS project is funded by the National Scientific Committee 5 (CSN5) of INFN within the competitive call "Development of quantum technologies applicable to fields of physics of interest to INFN" and by MSCA-IF-2020 n. 101027746
DARTWARS collaboration: https://dartwars.unimib.it/collaboration
News on the Physics Department web site.
[1] M. A. Castellanos-Beltran et al., “Measurable Improvement in Multi-Qubit Readout Using a Kinetic Inductance Traveling Wave Parametric Amplifier,” IEEE Transactions on Applied Superconductivity, pp. 1–5, 2025, doi: 10.1109/TASC.2024.3525451.
[2] M. Faverzani et al., “Broadband Parametric Amplification in DARTWARS,” J Low Temp Phys, vol. 216, no. 1, pp. 156–164, Jul. 2024, doi: 10.1007/s10909-024-03119-9.
[3] L. Howe et al., “Compact Superconducting Kinetic Inductance Traveling Wave Parametric Amplifiers With On-Chip rf Components,” IEEE Transactions on Applied Superconductivity, pp. 1–7, 2025, doi: 10.1109/TASC.2025.3553466.
[4] L. Howe et al., “Kinetic Inductance Traveling Wave Parametric Amplifiers Near the Quantum Limit: Methodology and Characterization,” Jul. 10, 2025, arXiv: arXiv:2507.07706. doi: 10.48550/arXiv.2507.07706.
