YQuantum

YQuantum is a Swiss deep-tech start-up that develops cryogenic hardware components for quantum computers. Operating since 2025 and recognised as a start-up of both ETH Zurich and the University of Basel, the company focuses on the miniaturisation of quantum hardware into compact, fully integrated modular systems. Its stated mission is to unleash the full potential of quantum computing by eliminating today's and tomorrow's hardware bottlenecks, so that quantum platforms can scale not despite their hardware but because of it. The company takes a holistic view of the cryogenic stage, from signal filtering and thermalisation to quantum processor unit (QPU) packaging. Its product line includes quantum packaging such as 8 RF-port and 20 RF-port sample boxes, flux bias tees (BiasT) for room-temperature and cryogenic use, a 12-channel cryogenic BiasT array, infrared and low-pass filters including a high-density filter array, and coldfinger and shielding components. These components are designed for high-fidelity superconducting- and spin-qubit operations, with emphasis on thermalisation, light-tight shielding, signal integrity, and minimal thermal load. YQuantum is led by a founding team with more than 50 years of combined expertise in quantum technologies and nanoscience. Dr. Christian Jünger is Co-Founder and CEO, Dr. Johannes Herrmann is Co-Founder and CTO, and Prof. Christian Schönenberger is Co-Founder and Scientific Advisor. The team brings together experience from academia, industry, and research institutions including ETH Zurich, the University of Basel, UC Berkeley, and Zurich Instruments. The company positions itself as a supplier of enabling hardware for large-scale quantum computers, addressing the need for thousands of qubits to make quantum computing practically viable. Its products are aimed at research groups and companies working on superconducting and spin qubits, and it offers direct contact for special requests and availability.

YQuantum is a Swiss deep-tech start-up that has been operational since 2025. It was founded as a spin-off recognised by both ETH Zurich and the University of Basel, drawing on the founders' combined expertise in quantum technologies and nanoscience. The founding team includes Dr. Christian Jünger (Co-Founder, CEO), Dr. Johannes Herrmann (Co-Founder, CTO), and Prof. Christian Schönenberger (Co-Founder, Scientific Advisor). Dr. Christian Jünger is described as a leading expert in quantum technologies with a focus on quantum transport and superconducting qubits. After postdoctoral research at UC Berkeley, where he developed superconducting circuit elements, he moved into scientific business development. As CEO, he combines technical knowledge with a strategic vision for growth and innovation. Dr. Johannes Herrmann developed expertise in superconducting quantum technology through academic research and industry experience. During his PhD and postdoc at ETH Zurich, he specialised in the design and operation of superconducting quantum devices, and he also worked as an RF hardware engineer at Zurich Instruments. At YQuantum he leads R&D of quantum technology solutions. Prof. Christian Schönenberger led the Quantum and Nanoelectronics Group at the University of Basel for nearly 30 years. He serves as Scientific Advisor, bringing decades of academic leadership in quantum and nanoelectronics. The company's formation reflects a growing trend of academic quantum research groups commercialising specialised hardware components. YQuantum's initial product portfolio focuses on the cryogenic stage of quantum computers, including signal filters, thermalisation components, and QPU packaging. The company states that quantum computers need thousands of qubits to be practically viable, and it develops hardware components to make this possible, paving the way for large-scale quantum computers. Its products include specialised components for high-fidelity superconducting- and spin-qubit operations. As of its public launch, YQuantum operates as a private start-up and offers its products directly to research and industry customers, with contact available for special requests and availability checks.

• 2025

  YQuantum begins operations as a Swiss deep-tech start-up recognised by ETH Zurich and the University of Basel.

Enabling hardware for scalable quantum computing through cryogenic component miniaturisation and integration.

• Quantum Packaging 8 RF-Port Sample Box

  Compact sample box with 8 RF ports supporting few-qubit, high-coherence experiments with fast throughput; swappable, low-cost PCB enables rapid turnaround and multiple samples per cold finger.

• Quantum Packaging 20 RF-Port Sample Box

  20-port sample box supporting high-performance measurements of 5–15-qubit quantum processors, offering superior shielding, light-tightness, and thermalisation for advanced experiments.

• BiasT RT Flux BiasT

  Room-temperature flux bias tee delivering clean, reliable qubit control for higher-fidelity gates.

• BiasT Cryo Flux BiasT Array

  High-density array of 12 cryogenic Bias-T circuits delivering exceptional linearity, precise flux control, noise suppression, and minimal thermal load for high-fidelity gates in large-scale superconducting architectures.

• IR-Filter

  Infrared filter for microwave signals built with a unique fabrication process (patent pending); can be integrated anywhere, blocking infrared noise while preserving qubit performance.

• HD Filter Array

  Ultra-compact low-pass and infrared filter array for flux lines.

• Coldfinger & Shielding

  Components for optimized QPU environments, engineered for superior thermalisation, light-tight shielding, and signal integrity.

1. 1YQuantum® – Small Parts. Giant Leaps.yquantum.ch
2. 2About – YQuantum®yquantum.ch
3. 3Products – YQuantum®yquantum.ch
4. 4YQuantumwikidata.org