Cryofree® Dilution Refrigerator for Quantum Computing Scale-Up

ProteoxLX

Large dilution refrigerator with high capacity for microwave lines for quantum computing scale-up. Base temperature of < 7 mK and high cooling power of > 25 µW at 20 mK.

Dry systems do not require the use of cryogenic liquids to provide the 4 K environment. Instead, pulse tube refrigerators are used. These enable push-button operation, can reduce the cost of ownership, and negate the need for a helium liquefier.

Our Cryofree® (cryogen free) range of products provides the user with much more experimental space and a larger sample plate, due to not needing a dewar surrounding the system containing the liquid helium for cooling. Mechanical vibrations from the pulse tube refrigerator are significantly reduced using a comprehensive range of vibration isolation techniques.

Quantum Computing Scale-Up

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

Superconducting Qubits

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

Spin Qbits

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

Key Specifications

Base Temerature:	< 7 mK
Cooling Power at 20 mK:	> 25 μW
Cooling Power at 100 mK:	> 850 μW
Sample Space Diameter:	530 mm plate
Line of Sight Access:	2 x Secondary Insert (117 mm x 252 mm), 4 x KF25
PTR Options:	2 x 1.35 W, 1.50 W or 1.80 W
Temperature Control Range:	7 mK to 30 K with magnet at full field
Magnet Options:	Solenoid: up to 14 T Vector rotate: up to 9,1,1 T Field cancellation: < 10 mT

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Features

Maximise qubit counts with large sample space and capacity for coaxial lines, with up to a maximum of 256* SMA connectors per LX using the custom Secondary Insert
- Get in touch to discuss higher density wiring options
Exceptional capacity for input and output lines and signal conditioning components
Compatible with the Proteox dilution refrigerator Secondary Insert
Low vibration features for reduced noise and support of long qubit coherence times
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).

Platform Solutions

Software

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

System

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

Custom Secondary Insert

Ideal for a multi-user or multi-experiment setting, or future-proofing the system. Side loading Secondary Inserts can be exchanged between Proteox systems enabling experiments to be set up on a workbench prior to exchange. This is a significant advantage for optical experiments where alignment of components can be performed outside of the system.

Utilise a custom Secondary Insert for an optimised experiment, ready to run on system arrival by incorporating cold electronics such as circulators and amplifiers, directly during manufacture. All mounted hardware and components are factory installed.

Components mounted directly onto the Secondary Insert
Component bracketry factory installed
Amplifiers and isolators mounted in-line with coaxial cables for maximum space utilisation
Up to a maximum of 128 SMA connectors per custom Secondary Insert

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Options / Accessories

Secondary Insert Wiring and Signal Conditioning Sample Loader Magnets

Secondary Insert

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

Standard Options

ISO100‑2

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.

Custom Secondary Insert Option

Customise an entire Secondary Insert for your specific experimental needs.

Wiring and Signal Conditioning

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

Coaxial 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

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

Sample Loader

Our patented bottom loader and active gas gap heat switch technology enable fast sample turnaround times with sample puck cooldown times in less than 6 hours, particularly suited to magnet systems and for qubit screening. For the ProteoxMX, the sample loader is integrated onto a Secondary Insert, including hermetic feedthroughs and thermalisation hardware for provision of experimental wiring.

Easy Sample Loading Pucks 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

Magnets

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
All magnets ramp to full field in 1 hour or less
Quench protected

Vector Rotate 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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Resources

ProteoxLX Brochure

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