ProteoxQX is a uniquely extensible, connectable cryogenic platform for quantum computing implementation at data centre scale, providing configurable cooling power distributed across stages to match the customer's quantum stack architecture.
A patented design with rectangular footprint enables both efficient space usage and inter-connectivity of units, with not only contiguous vacuum space but inter-connected cold stages. Intermediate cooling "slices" can be interposed between ProteoxQX system units to provide additional cooling.
ProteoxQX benefits from Quantum Design Oxford's unique Secondary Insert scaling pathway that follows customers' development and growth roadmaps by allowing prototyping and scale-up across the ProteoxMX, LX and QX families. By having the complete customer wiring pack mounted on the removable Secondary Insert (SI), seamless transfer of wiring packs from one platform to another enables highly efficient design iteration, validation and troubleshooting.
The self-supporting Secondary Insert design further allows off-system wiring and pre-testing, and simplicity of loading and unloading to the system.
| ProteoxMX | ProteoxLX | ProteoxQX | |
| Number of Secondary Inserts: | One | Two | Four (4SI) Six (6SI) |
The uniquely modular design of ProteoxQX means that implemented systems are configured to the customer's stack architecture needs.
Cooling power distribution is configured from pulse tube refrigerator (PTR) stages at 40 (PT1) and 4 Kelvin (PT2), intermediate stages at 0.7 Kelvin (still) and 100 millikelvin (cold plate), to the dilution unit mixing chamber stage at < 10 millikelvin.
A ProteoxQX system may therefore be modularly configured by selecting the number and power of the PTRs, whether to retain a dedicated 1 K stage, and the number and placement of dilution units. The directly controllable cooling power on different stages reduces the number of PTRs required to cool down the system itself.
| ProteoxQX 4SI | ProteoxQX 6SI | |
| Pulse tube refrigerator (PTR) number | 3 to 4 of typically 2.0 to 5.0 W each | 5 to 8 of typically 2.0 to 5.0 W each |
| 100 mK | 2550 µW | |
| 20 mK | 75 µW | |
Subject to configuration and selection of cooling power targeting. Cooling powers are intrinsically interdependent and respective maximum cooling power is not available simultaneously at all stages. |
||
Our Quantum Design Oxford system engineering team and cryogenic specialists work closely – and confidentially – with each customer to define system performance requirements and map these to the optimal cooling configuration.
Two ProteoxQX 4SI connected units. Renders used to protect customer confidentiality. Connected ProteoxQX 6SI units are shown in our March 2026 blog.
Connection and extension of ProteoxQX system units is at the heart of its concept and design – and the full-performance connection of two ProteoxQX 6SI units has already been proven in practice as shown in our March 2026 blog. This means that a ProteoxQX installation can be extended in the field to fit with the scale-up roadmap and investment profile, or indeed down-scaled and separated if necessary, protecting customer investment.
Our unique and patent-protected1 ProteoxQX technology enables connection not only of vacuum vessels to form a single multi-system contiguous vacuum space, but also of the multiple cold plates of the dilution refrigerator. This can make square-metres of cold real estate available, including at millikelvin temperature, allowing QPU interconnection without having to route wiring outside of the cryostat to ambient, room temperature connections between systems. Read more in our June 2025 blog.
1US patent no. 12,320,557 B2
ProteoxQX is designed with front and back wide opening doors and fully removable thermal shields for complete cold space and quantum processor unit (QPU) access during development, and for servicing in commercial data centre implementation.
With QPU wiring carried on multiple Secondary Inserts, removing or replacing a wiring stack for off-line iteration or troubleshooting is straightforward and time-saving.
If you are uncertain about future intersecting QC technologies or the scale-up roadmap of your system design, ProteoxQX protects your investment. An existing ProteoxQX system can be upgraded in the field to integrate modular cooling expansions via additional PTR "slices", or non-PTR cooling power units.
Such additional "slices" also give uninterrupted operation, with thermal stability and serviceability.
DECS is the web-based secure software platform used across Quantum Design Oxford products, providing a universal suite for instrument monitoring and control, and configured to industry-standard, ISO-compliant interfaces for Proteox platforms in a commercial setting.
To discuss your requirements:
Contact UsCopyright © 2026 Quantum Design Oxford
