Silent Waves Launches Zephyr, a Traveling Wave Parametric Amplifier for Scaling Quantum Architectures
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Silent Waves Launches Zephyr, a Traveling Wave Parametric Amplifier for Scaling Quantum Architectures By Dr.
George Schwartz Silent Waves has launched its Zephyr product, a Traveling Wave Parametric Amplifier (TWPA) that physically integrates a microwave pump coupler directly into the amplifier architecture. This structural integration addresses a spatial limitation within the dilution refrigerator by eliminating the need for separate, bulky external directional couplers typically required in standard readout chains. While the company’s previous Argo line focused on stable performance within the 4 to 8 GHz transmon band, the Zephyr specifically targets the footprint reductions necessary for scaling quantum architectures. Consistent with their standard manufacturing protocol, all Zephyr units undergo comprehensive cryogenic testing at 20 mK, a process taking anywhere from 30 hours to several days, prior to deployment. The consolidation achieved by the Zephyr is a direct response to the thermodynamic and multiplexing challenges of scaling quantum processors. Standard readout lines currently support 5 to 10 multiplexed qubits, but scaling toward 100 qubits per line demands expanded bandwidth, which sequentially increases the required continuous microwave pump power. Although CEO Luca Planat notes that pump power may not be the primary thermal bottleneck, the cumulative thermal load of increased multiplexing and discrete peripheral connections remains a tangible constraint. By bringing the pump coupler on-chip, the Zephyr reduces the number of physical connections, minimizing associated thermal dissipation and insertion loss to offer a more condensed readout architecture. Despite the component reduction achieved by the Zephyr, the system does not fully resolve the spatial challenges of the readout chain, as external ferrite isolators are still required to prevent back-action noise from reaching the qubits. The Zephyr serves as an intermediary hardware step toward the company’s upcoming Traveling Wave Parametric Amplifier Isolator (TWPAI). The TWPAI will utilize a three-wave mixing process to up-convert the frequency of backward-propagating noise, effectively removing the need for magnetic isolators entirely. This product progression outlines a roadmap focused on sequentially condensing the standard four-part discrete readout assembly (isolator, coupler, amplifier, isolator) into a single physical unit. Moving highly integrated components like the Zephyr from research prototypes to volume deployment is primarily bottlenecked by fabrication yield rather than the time-intensive cryogenic testing. To ensure consistent manufacturing without relying on process-variable, Silent Waves requires locked-in fabrication pilot lines. This is being addressed through their participation in the EU-funded SUPREME consortium, which aims to establish stable superconducting manufacturing lines over the next 1 to 1.5 years. Simultaneously, the functional utility of these condensed readout lines is being evaluated for fault-tolerant applications through the Adastar collaboration, where partners like IQM, Riverlane, and OQS assess how such integrated hardware impacts quantum error correction and scaling. More information about the Zepher product is available in an announcement available on the Silent Waves website here. March 25, 2026 dougfinke2026-03-25T11:47:55-07:00 Leave A Comment Cancel replyComment Type in the text displayed above Δ This site uses Akismet to reduce spam. Learn how your comment data is processed.