Quantum interconnects and transduction Market Outlook 2026–2038: Growth Drivers, Key Companies, Strategic Developments & Adoption Forecast — A Meticulous Next™ Foresight Brief

This Meticulous Next™ brief examines quantum interconnects and transduction, the technologies that link separate quantum processors, including transducers that convert quantum states between microwave and optical signals so that superconducting qubits can connect through optical fibre. It tests how far modular quantum computers built from linked processors move from laboratory links to commercial networks by 2038, and what that means for quantum firms, networking suppliers and defence agencies.

Modular design is the stated route to scale. A review by Fujitsu Research dated 18 September 2026 states that interconnecting dilution refrigerators is considered inevitable for large fault tolerant machines, because a single cryostat cannot hold all the qubits. The conclusion is that links between machines are a requirement of the scaling roadmap, not an optional feature, and the quality of the link sets the quality of the combined machine.

The physics sets a hard target. The same review reports that a direct one-way transducer needs a conversion efficiency above one half with added noise well below one photon, that no method yet reaches both at once, and that the best reported conversion from a superconducting qubit to an optical photon is about 8 in 10,000. The conclusion is that transduction is the hardest part of the link and that heralded and teleportation based schemes, which avoid the efficiency threshold, are the practical bridge.

Large players have set dates. IBM and Cisco announced on 20 November 2025 a plan to link fault tolerant machines, with a two-machine entanglement proof of concept by 2030, a scalable multi-node network a few years later and long distance networking in the latter half of the decade, and QphoX launched its Quantum Transducer on 12 March 2026 with IBM as the first partner to test it. The conclusion is that product vendors and the largest builders now work together on the same link, and the first tests are under way.

The brief treats quantum interconnects and transduction as an emerging signal with a twelve year horizon to 2038. It identifies which transducer makers, networking suppliers and quantum builders capture value as modular machines become the norm. It is a focused 107-page decision brief that presents an indicative trajectory rather than a segmented market model.

Superconducting qubits speak microwave and fibre carries light. A transducer converts a quantum state between the two while keeping its coherence, and conversion efficiency above one half is needed for direct state transfer. The conclusion is that the link is only as good as its efficiency and added noise, and both depend on the pump power that drives the device.

Several approaches compete. Electro-optomechanical devices reached an efficiency of 0.47, electro-optic devices reached added noise below 0.12 at low efficiency and a Rydberg atom scheme reached 0.82 at room temperature, according to the Fujitsu Research review. The conclusion is that each approach is strong on one measure and weak on another, and no method yet reaches high efficiency and low noise together.

Heralded links offer a bridge. Heralded entanglement and teleportation schemes avoid the efficiency threshold but need two-way classical communication. IBM plans a Quantum Networking Unit to interface its processors with photonic links, and reported in August 2026 that it connected two cryogenic modules in a shared environment below 15 millikelvin. The conclusion is that short links between nearby refrigerators come first and long distance links follow.

Networks are being tested in parallel. Photonic Inc reported in February 2026 teleportation over 30 kilometres of a commercial fibre network in Vancouver, and Nu Quantum raised a 60 million dollar Series A in December 2025 to build networking units. The conclusion is that fibre links between quantum devices are moving from the laboratory to field tests, and investors are funding the interface hardware.

The limits are conversion efficiency, added noise, pump power and heating, bandwidth and the lack of measured data on products in use. The brief tests each limit against the evidence to 2038.

The quantum interconnects and transduction market, covering microwave-to-optical transducers, quantum networking units, photonic interconnect hardware and related software and services that link separate quantum processors, and excluding quantum processors themselves, quantum key distribution and classical optical networking, is valued at USD 0.06–0.10 billion in 2026 and is projected to reach USD 2.86–4.77 billion by 2038, at a CAGR of 38%.

The 2026 base rests on early transducer products, test devices for large builders and research and development contracts. Growth then follows the efficiency and noise reached by transducers, the pace of modular machine designs and the funding of networking programmes.

The forecast is sensitive to the date of the first two-machine link, the choice between transduction and other link types and the pace of national and defence funding.

The base case assumes the two-machine link is demonstrated by 2030 and multi-node networks follow within a few years, bringing the inflection to about 2033 and a 2038 value near the middle of the range. An accelerated case assumes a faster gain in transducer efficiency and early orders from large builders, moving the inflection to 2031 and lifting the 2038 value to the top of the range. A delayed case assumes that efficiency and noise targets are not met together and that builders favour single larger cryostats, moving the inflection to 2036 and holding growth at the bottom of the range.

Growth drivers

• Modular quantum architectures.
• National programmes and defence funding.
• Partnerships between quantum builders and networking suppliers.
• Demand for distributed quantum computing.

Enablers

• Photonic chips and optical fibre networks.
• Network control software and protocols.
• Telecom operators and equipment makers.
• University and national laboratory research.

Restraints and barriers

• Efficiency below the required threshold.
• Pump power and heating.
• Competing architectures.
• Limited measured data.

The direction of quantum interconnects and transduction is set by the move to modular quantum machines, progress in conversion efficiency and noise, the funding of national and defence programmes, the readiness of networking suppliers and the choices of the leading quantum builders.

The key participants in quantum transduction and interconnects for modular quantum computers include International Business Machines Corporation, Cisco Systems, Inc., Fujitsu Limited, Nokia Corporation, Nippon Telegraph and Telephone Corporation, Toshiba Corporation, Ciena Corporation, Corning Incorporated, Lumentum Holdings Inc., Coherent Corp., Hewlett Packard Enterprise Company, Alphabet Inc., Microsoft Corporation, Amazon.com, Inc., TELUS Corporation, BT Group plc, Deutsche Telekom AG, Thales S.A., Airbus SE, Lockheed Martin Corporation, QphoX, Nu Quantum, Photonic Inc., National Grid Partners, Qunnect, IonQ, Inc., Rigetti Computing, Inc., Xanadu Quantum Technologies, PsiQuantum, Oracle Corporation, Delft University of Technology, the University of Cambridge, the Defense Advanced Research Projects Agency, the National Quantum Computing Centre and the United States Department of Energy.

The brief profiles representative participants in each archetype and assesses which are positioned to lead as modular quantum machines become the norm.

QphoX and Nu Quantum lead among start-ups that sell transducers and networking units, International Business Machines Corporation and Fujitsu Limited lead among builders with stated link programmes, and Cisco Systems, Inc., Nokia Corporation and Ciena Corporation lead among networking suppliers. Competitive intensity is low today and will rise as networks are tested.

Where value migrates.

In 2026 value sits with start-ups and research programmes that sell transducers and test devices to large builders. By 2033 it moves toward builders and networking suppliers that integrate links into modular machines and test networks, because customers want working systems and not components. By 2038 it settles with suppliers whose interconnect layer runs reliably across many processors, where efficient transducers, control software and network integration carry the margin. Margins hold for suppliers with measured efficiency and noise performance and narrow for suppliers that cannot meet the thresholds.

A modular scaling roadmap, a named product, a large builder and networking partnership and field tests support growth, while efficiency below the required threshold, pump power and heating and limited measured data hold back the pace.

A transducer that meets the efficiency and noise thresholds, a failure to reach them, or a change in national and defence funding could shift the pace. The brief therefore tracks four indicators: conversion efficiency and added noise, links demonstrated between machines, orders from large builders and the amount of public and private funding.

Two-machine links first, then scalable multi-node networks, then a standard interconnect layer in modular machines is the expected order of change.