Quantum computing is advancing from laboratory curiosity to engineered systems capable of tackling problems that classical computers cannot. As the hardware matures, the interconnects that hold it together matter more than ever — and increasingly, those interconnects are fiber optic.
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At Impact ES–Ventura, formerly Coastal Connections, we work directly with leading quantum computing developers on the fiber-optic assemblies that make their systems function. In this article, we explain why fiber optics have become indispensable to quantum hardware — and what that means for engineers specifying components for quantum systems.
Quantum hardware presents a unique interconnect problem. Superconducting qubit systems must operate at temperatures near absolute zero — sometimes as low as 20 millikelvins, a tiny fraction of one degree above absolute zero. Trapped ion systems require precise optical access for laser-based qubit control. Photonic quantum computers need fiber-based pathways for photon generation, routing, and detection.
In every case, the connection between quantum hardware and the room-temperature electronics that control it must satisfy requirements that conventional electrical wiring simply cannot meet.
Low thermal conductivity: Optical fibers do not conduct heat the way metal wires do. In cryogenic quantum systems, this is critical — a high-conductivity connection between room temperature and a millikelvin stage would introduce thermal load that disrupts qubit coherence.
Electromagnetic immunity: Fiber optic cables carry light, not electrical current. They are inherently immune to electromagnetic interference — a major concern in quantum systems, where even subtle noise can corrupt quantum states.
High bandwidth: A single optical fiber can carry far more information than a metal wire of equivalent size, enabling high-throughput control and readout of increasingly complex quantum processors.
Ultra-low signal loss: Precision-engineered fiber assemblies can deliver optical signals with extremely low insertion loss, preserving the integrity of the photons that carry quantum information.
Photonic compatibility: Many quantum computing architectures, including photonic quantum computers, use photons as qubits. Fiber optics are the natural medium for routing, manipulating, and measuring these photonic qubits.
Researchers at the National Institute of Standards and Technology (NIST) demonstrated that a photonic link using optical fiber to guide modulated laser light from room temperature to a cryogenic photodetector could meet the requirements of superconducting quantum information processing, with qubit state accuracy of 98 percent, matching that of conventional coaxial lines.
This represents a significant milestone: fiber optics can deliver quantum control signals with the fidelity quantum systems require, while eliminating the thermal burden of metal wiring.
Not all fiber optic assemblies are suitable for quantum applications. Quantum-grade assemblies require ultra-low optical loss at each connector interface, precise fiber alignment (especially for polarization-maintaining fibers), coatings compatible with cryogenic thermal cycling, and custom optical architectures designed for the specific hardware environment.
Impact ES–Ventura designs and manufactures custom fiber assemblies for quantum computing developers, from early prototypes through production. Our capabilities include PM fiber assemblies, cryogenic-compatible designs, ultra-low-loss connectors, and precision testing across multiple wavelengths.
Fiber optics are not a peripheral component of quantum computing systems. They are a critical enabler of the precision optical connectivity that quantum hardware demands.
Impact ES–Ventura works directly with the world's leading quantum computing developers. Let's talk about your system.
