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ProteoxLX Cryofree® dilution refrigerator for quantum computing scale-up.

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Maximise superconducting qubit count with a larger area for customisable superconducting wiring and signal conditioning components

Superconducting Qubits

Configure your system with high RF line counts, customisable wiring and optional superconducting magnets for experimental applications

Spin Qubits

Integrate multiple optical fibres on numerous non line of site ports and choose to access the sample space via optional windows

Optical Quantum Applications

ProteoxLX Features

Large cooling power with > 25 uW of cooling power available at 20 mK, low base temperature at < 7 mK and twin Pulse Tube Refrigerators (PTR) allows for several watts of dissipation at the 4 K plate (exceptional PTR damping).

Compatible with the Proteox dilution refrigerator Secondary Insert, a fully customisable, self-supporting module for fast installation and exchange of full experimental set-up

Exceptional capacity for input and output lines and signal conditioning components 

High capacity for coaxial wiring with large, fully customisable line of site access from Secondary Insert – 117 mm by 252 mm usable space per insert - perfect for scaling up systems and integrating customer-specified wiring and cold electronics

Maximise qubit counts with large sample space and capacity for coaxial lines

Low vibration features for reduced noise and support of long qubit coherence times

Secondary Insert

The Proteox dilution refrigerator Secondary Insert is a customisable, self-supporting module for installation and exchange of full experimental set-ups.


Moving beyond standard access ports, the Secondary Insert can accommodate full experimental set-ups, including DC wiring, coaxial wiring and signal conditioning components.

  • Flexible, modular format enhances adaptability to varied application requirements
  • Large 117 mm × 252 mm rectangular LOS access port. This can be configured as a single customisable plate, or with 2 × ISO100 ports and a range of standard options 
  • The Secondary Insert can be ordered with our patented bottom loading system as an option. This enables rapid sample exchange and can be coupled with magnet integration.

ISO100 Port Configurations

A standard configuration of 2 x ISO100 ports, with multiple ISO100 options to provide experimental wiring.

  • Up to 37 UT85 coax per ISO100 port
  • Blanking plate option with tapped M3 grid array for mounting of experimental hardware.

Optional Blank Plates Instead Of SI

  • Blanking plate with tapped M3 grid array option if SI not required.

ISO100 Port Configurations

A standard configuration of 2 x ISO100 ports, with multiple ISO100 options to provide experimental wiring.

  • Up to 37 UT85 coax per ISO100 port
  • Include DC and coax combinations on a single ISO100 port
  • Blanking plate option with tapped M3 grid array for mounting of experimental hardware.

Custom Configuration

  • Components can be directly mounted onto the Secondary Insert plate, creating a platform tailored to your experiment
  • Custom configurations enable up to 128 UT85 coax lines per Secondary Insert
  • Customisable insert for experimental wiring optimisation
  • Componentss mounted directly onto the SI to maximise space.

Cryogenic Low Noise Amplifiers And RF Components

A selection of low noise amplifiers, isolators and circulators can be integrated into the wiring configuration.

  • Custom bracketry for mounting hardware - amplifiers, isolators etc.
  • Signal conditioning mounted in-line to maximise the number of components.


  • Remote access through a web-based, platform-independent
    control software in addition to local system control
  • Automation routines for one button operation
  • Full manual control and programmable API interface for
    custom routines
  • Powerful data interrogation and visualisation package with  live plotting


      • Fully redeveloped gas handling system to ensure the minimum number of connections and o-ring seals
      • Cross-braced stiffened frame that minimizes vibration transmission eliminating the need for active damping
      • Modular, upgradable platform with cross-compatible magnet systems

        900 μW dilution unit:

        • Base temperature: < 7 mK
        • Cooling power at 20 mK: 25 μW
        • Cooling power at 100 mK: > 850 μW
        • Line-of-sight access:  2 off Secondary Insert (117 mm × 252 mm) 4 × KF25
        • Temperature control range: 7 mK to 30 K with magnet at full field
        • Sample space: 530 mm diameter mixing chamber plate
        • 50 L of He-3 gas

        500 μW dilution unit:

        • Base temperature: < 10 mK
        • Cooling power at 20 mK: 12 μW
        • Cooling power at 100 mK: 450 μW
        • Temperature control range: 10 mK to 30 K with magnet at full field 
        • Sample space: 530 mm diameter mixing chamber plate
        • 18 L of He-3 gas

        Flexible Wiring

        • 24-way twisted-pair DC looms with copper, constantan or NbTi conductors
        • Flexible coaxial (S1) wiring for use up to 500 MHz
        • Single-mode and multi-mode optical fibres
        • Thermo-coaxes for effective filtering of high-frequency noise
        • Low-impedance looms suitable for nano-positioning piezo devices.

        Line-of-sight wiring

        • UT34 and UT85 coax with SMA or SK connectors for 18 GHz or 40 GHz bandwidth operation
        • Range of coax conductors including stainless-steel, CuNi and NbTi
        • Heat sinking using bulkhead connectors at all experimental plates with optional 0 dB attenuators for efficient conductor thermalisation.


        Attenuators can be selected per line and per plate; 0 dB attenuators for conductor thermalisation; 3 dB, 6 dB, 10 dB and 20 dB attenuators.

        Low Pass Filters

        Low-pass multi-stage filters can be mounted for use at temperatures to below 100 mK.

        • 4 cut-off frequencies available between 170 Hz and 110 kHz.
        • Gold plated copper chassis with RF gaskets to provide screening and thermal dumping for the filter PCB.
        • Easy sample exchange without the need to warm the entire system to room temperature
        • Loading a sample puck takes < 15 minutes and the system automatically cools back to base temperature
        • Up to 28 RF and 96 DC connections on a single sample puck
        • Ideal solution for multi-user facilities since different experiments can be prepared in multiple sample pucks
        • Patented loading concept allows for safe and easy operation
        • ESD protection (make-before-break) via sample grounding or biasing before the puck docks with the system.

        Solenoid Magnets

        • Range of field strengths from 1 T to 14 T
        • High filament count for reduced size, high sweep rate and low flux jumping
        • Large bore sizes from 77 mm to 152 mm diameter across the solenoid magnet range
        • Maximum sweep rate of 2 Amp/minute
        • Quench protected.

        Vector Rate Magnets

        • 3 axis vector magnets with a vertical field up to 9 T and a horizontal field up to 3 T
        • 90 mm large bore across all high field vector rotate options.

        Customised Magnets

        • Customised options for improved homogeneity, persistence stability or field resolution
        • Specialised capability for advanced magnet design including split pair and actively shielded magnet systems.
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