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COMPANY RESEARCH / HUBN.SW

Huber+Suhner

Cryogenic NbTi/CuNi coax, multicoax and non-magnetic SMA

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Where it fits in a quantum computer

Sells a quantum-computing range of cryogenic interconnects: 0.86 mm semi-rigid coax in NbTi (superconducting below 9 K, under 0.5 dB/m at 4 K and 10 GHz), CuNi, CuBe and stainless steel; non-magnetic SMA connectors with hermetically sealed bulkhead adapters; cryogenic attenuator blocks; and an MXP multicoax system with 192 channels on an ISO 100 flange, built-in IR filters and ganged attenuators that runs from room temperature to the mixing chamber. Its 2025 management report says it is working with Bluefors on interconnects for next-generation cryogenic quantum applications, and its 2025 annual report says it won additional quantum-computing projects.

What the evidence establishes

Quantum-computing evidence

Disclosed: Huber+Suhner’s 2025 management and annual reports describe its Bluefors collaboration and quantum-computing projects, and its product pages give the cryogenic cable, connector and multicoax specifications.

An explicit quantum-computing product, design-in, supply role, program or partnership, such as a part sold for quantum computers or a named quantum-computer customer. For a maker, it means the company’s own quantum computers or processors. This does not establish revenue, market share, volumes or future sourcing.

Component roleCryogenic NbTi/CuNi coax, multicoax and non-magnetic SMA
EvidenceDisclosed: Huber+Suhner’s 2025 management and annual reports describe its Bluefors collaboration and quantum-computing projects, and its product pages give the cryogenic cable, connector and multicoax specifications.
How we knowDisclosed The company’s own filing, release, annual report, product page or investor record describes the quantum-computing role. Where customers are unnamed, the listing says so.
Primary sourceHuber+Suhner — supporting disclosure
Company or official disclosure; vendor claims are attributed to their source.
Checked. This is the research review date, not the source publication or quote time.

Keep in perspective

Huber+Suhner does not report quantum-computing sales; they sit in a niche of the Industry segment, which had CHF 325.2 million of the group’s CHF 864.1 million 2025 net sales. The Bluefors work is described as development, and no quantum-computer maker is named as a customer.

Diversified business exposure. This describes the breadth or role of the business; it is not an investment rating. A quantum-computing product, design-in or partnership does not by itself establish material quantum revenue, market share, or future returns.

Connections to the assembly

These links explain the technology relationship. The model is illustrative and does not represent an actual manufacturer’s bill of materials.

Coaxial lines

Semi-rigid coaxial cables of stainless steel, copper-nickel or superconducting niobium-titanium, chosen stage by stage to carry microwave signals while conducting little heat.

Scope of the company links: Semi-rigid coax (stainless steel, CuNi, CuBe or superconducting NbTi, often 0.86 mm) carries drive, flux and readout signals between stages. Huber+Suhner is mapped for its quantum-computing semi-rigid range, with NbTi lines under 0.5 dB/m at 4 K and 10 GHz; QuantumCTek sells cryogenic cable assemblies in CuNi, stainless, aluminum and NbTi specified stage by stage; QTREX’s printed coaxial interconnect is still pre-commercial. Much of the market is private: COAX Co. (Japan), TOTOKU (Japan, Carlyle-owned since its 2023 delisting), CryoCoax (an Intelliconnect division), Radiall and Bluefors, which wires its own refrigerators. Furukawa sold its 57% TOTOKU stake in 2022, and Fujikura and Furukawa showed no current quantum coax role in the sources checked.

Flex cables

Flexible ribbons carrying dozens of microwave or DC lines side by side on a thin film, a denser alternative to individual coaxial cables.

Scope of the company links: High-density wiring that carries many lines per cable or ribbon. Printed flex ribbons come from private firms: Delft Circuits’ Cri/oFlex (eight NbTi or silver striplines per 0.3 mm flex with built-in attenuators and filters, sold with Bluefors) and Maybell’s LF CryoTrace, based on an MIT Lincoln Laboratory design it licensed (MIT News, June 2026). Huber+Suhner is mapped for its MXP multicoax system (192 flexible or semi-rigid coax channels on an ISO 100 flange, running to the mixing chamber), Hirose for its SER unit’s NbTi multi-channel coax connector cables and QTREX for printed high-density interconnects in development; these are coax harnesses rather than printed ribbons. Bluefors’ High-Density Wiring (up to 168 lines per port) is private. Rigetti’s 10-K says Quanta Computer may develop flexible cables under a 2025 collaboration, a possibility rather than a disclosed product, so Quanta is not mapped here.

Attenuators

Small cryogenic attenuators bolted to the plates on every input line. Each absorbs most of the signal together with the thermal noise from warmer stages above.

Scope of the company links: Attenuators anchored at 4 K, the cold plate and the mixing chamber strip thermal noise from input lines. Amphenol is mapped through XMA, which sells cryogenic attenuators (including bulkhead types), terminations and DC blocks for quantum computing and which Japan’s 2025 AIST–RIKEN–Fujitsu–NEC roadmap names among the most used cryogenic SMA attenuators; Huber+Suhner sells 0–20 dB cryogenic attenuator blocks and ganged attenuators in its multicoax system; QuantumCTek sells cryogenic attenuators with its cable assemblies. Private alternatives include API Technologies, Radiall, Quantum Microwave, CryoCoax and Delft Circuits (attenuators on the flex). Smiths Interconnect, now owned by Molex, makes RF attenuators, but no cryogenic quantum line was found.

Filters & IR absorbers

Low-pass and band-pass filters and infrared-absorbing filters that block stray high-frequency radiation, which would otherwise break the qubits’ superconducting pairs.

Scope of the company links: Low-pass, band-pass and infrared filters keep stray radiation and out-of-band noise off the qubits. Amphenol’s XMA sells cryogenic IR filters (the AIST roadmap says IR filters, once home-made by researchers, are now sold as products by XMA Amphenol and Kawashima Seisakusho), Huber+Suhner builds IR filters into its multicoax system, and QuantumCTek sells cryogenic filters with its cable assemblies. Qnity is mapped as an upstream material supplier: its Laird Eccosorb absorbers are cast into IR filters, as in ETH Zurich’s Eccosorb CR-124 filter. Conventional low- and high-pass filters come mostly from private Mini-Circuits and RLC Electronics; the roadmap also lists a ‘K&L’ filter maker, which we did not tie to Dover. Bluefors, Quantum Microwave and Delft Circuits sell private IR-filter products.

Connectors & feedthroughs

Miniature coaxial connectors at every stage and hermetic feedthroughs in the top plate that carry the lines out of the vacuum without leaking.

Scope of the company links: SMA connectors dominate between stages, smaller non-magnetic SMP or SMPM connectors sit near the chip, and hermetic feedthroughs seal the vacuum can. Huber+Suhner sells non-magnetic SMA connectors, hermetic bulkhead adapters and multicoax connectors for quantum computing; the AIST roadmap says JAE’s non-magnetic SMPM connectors are almost the only option at that size; QuantumCTek sells vacuum-hermetic adapters; Hirose’s SER unit sells NbTi multi-coax connectors for quantum computers; and TE and Bel Fuse’s Cinch are named as makers of micro-D connectors used for dense DC wiring, a generic role. Private suppliers include Rosenberger (non-magnetic SMP, widely used in Japanese labs), Fischer (hermetic DC connectors), Radiall and CryoCoax.

Related research

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