| Title: |
Measurable Improvement in Multi-Qubit Readout Using a Kinetic Inductance Traveling Wave Parametric Amplifier |
| Authors: |
Castellanos-Beltran, Manuel A.; Howe, Logan; Giachero, Andrea; Vissers, Michael R.; Labranca, Danilo; Ullom, Joel N.; Hopkins, Peter F. |
| Contributors: |
Castellanos-Beltran, M; Howe, L; Giachero, A; Vissers, M; Labranca, D; Ullom, J; Hopkins, P |
| Publisher Information: |
Institute of Electrical and Electronics Engineers; US |
| Publication Year: |
2025 |
| Collection: |
Università degli Studi di Milano-Bicocca: BOA (Bicocca Open Archive) |
| Subject Terms: |
Kinetic inductance; multi-qubit; noise; quantum computing; quantum-limit; traveling wave parametric amplifier |
| Description: |
Increasing the size and complexity of quantum information systems requires highly-multiplexed readout architectures, as well as amplifier chains operating near the quantum limit (QL) of added noise. While documented prior efforts in KI-TWPA integration in quantum systems are scarce, in this work we demonstrate integration of a KI-TWPA with a multiplexed-qubit device. To quantify the system noise improvement we perform an ac Stark shift calibration to precisely determine noise power levels on-chip (at each cavity's reference plane) and the total system gain. We then characterize the qubit state measurement fidelity and the corresponding signal-to-noise ratio (SNR). To conduct the most faithful measurement of the benefits offered by the KI-TWPA we perform these measurements for readout chains where the high electron mobility transistor (HEMT) amplifier is the first-stage amplifier (FSA) - with none of the external hardware required to operate the KI-TWPA - and with the KI-TWPA as the FSA. While some readout cavities fall outside the KI-TWPA bandwidth, for those inside the bandwidth we demonstrate a maximum improvement in the state measurement SNR by a factor of 1.45, and increase the fidelity from 96.2% to 97.8%. These measurements demonstrate a system noise below 5 quanta referenced on-chip and we bound the KI-TWPA excess noise to be below 4 quanta for the six cavities inside its bandwidth. These results show a promising path forward for realizing quantum-limited readout chains in large qubit systems using a single parametric amplifier. |
| Document Type: |
article in journal/newspaper |
| File Description: |
STAMPA |
| Language: |
English |
| Relation: |
info:eu-repo/semantics/altIdentifier/wos/WOS:001398613700004; volume:35; issue:5; firstpage:1; lastpage:5; numberofpages:5; journal:IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY; https://hdl.handle.net/10281/531801; https://ieeexplore.ieee.org/document/10820366 |
| DOI: |
10.1109/tasc.2024.3525451 |
| Availability: |
https://hdl.handle.net/10281/531801; https://doi.org/10.1109/tasc.2024.3525451; https://ieeexplore.ieee.org/document/10820366 |
| Accession Number: |
edsbas.9E1F7FD7 |
| Database: |
BASE |