Microwave drive lines
Drive your qubits!
Microwave drive lines for superconducting qubits provide signals to carry out gate operations. The key requirements on this line type are the signal integrity in the operational range (6-8 GHz) as well as their isolation and noise level.
- Microwave transmission cut off at 8 GHz
- Less than 6 nW / channel at 20mK passive heat load
- Inline attenuation of 50 dB optimised for noise suppression
- Benchmarked to be equivalent or better than standard coaxial solutions
General Specifications
| Storage temperature | 0 K to 320 K |
| Operating temperature | 0 K to 400 K (gradient) |
| Applications | Qubit drive for super-conducting qubits or similar |
| Number of channels | 8 |
| Transmission type | Stripline |
| Connector type | SMA female / SMP |
| Primary flex materials | Polyimide, Silver |
| Minimum bending radius | 5 mm |
| Required length for 180° longitudinal rotation | 10 mm |
| Vacuum feedthrough connection | KF25/40, ISO 100 side and top loader ports |
| Vacuum feedthrough leak rate | < 10-9 mbar L/s |
Cable overview
The product includes SMA/SMP connector blocks to interface to the room-temperature electronics and chipholder at the mK stage. They are provided with vacuum feedthroughs designed to carry multiple flexes through the vacuum barrier and are compatible with most fridge types (Bluefors, Oxford Instruments and more). The chain of attenuators (total -50 dB) is integrated into the flexible substrate and located at the thermal clamps for optimal thermalization and electron noise, with additional 8 GHz low-pass filtering located at the 0.6 K stage. Below the 100 mK plate, infrared filtering is placed and thermalized with a slope of -1dB/GHz to further filter out high frequency radiation.
Used for
- Excitation between qubit states
- Measure qubit state
- Apply general microwave signals
Optimised for
- Signal power and integrity
- Noise temperature
- Minimising active & passive thermal load
Key Features
- 8 Channels per flex
- 8 GHz low-pass filter
- 50 dB distributed attenuation
- Infrared filter
Microwave Response
A microwave drive line is optimised for low loise microwave transmission up to 8 GHz. In this way one can apply microwave drive signals to your qubit or cryogenic circuit, without opening noise channels.
With 50 dB attenuation distributed over different temperature stages one obtains the optimal balance between active heat load, and opening loss channels through loss channels.
With a low-pass filter at 8 GHz and a an IR-filter on flex your circuits are maximally protected for high-frequency interference.
Cross Talk
Cross talk is what we experience daily. Whether it is picking up unwanted conversations in the train, or a phone connection suffering from interference.
Cri/oFlex® has been designed such that each qubit is addressed individually. Learn more about cross talk in our core technology section.
How to
Integrate
Cri/oFlex® into your system?
Cri/oFlex® can fit in your system in many ways and Delft Circuits has multiple approaches to find a perfect fit for your wishes, options range from a one-stop-shop in cabling solutions or a full service I/O provider designing a specific solution for your I/O challanges.
Need some help picking the right option?
First questions to ask yourself is how your system is currently wired. Do you have a port available or full loader you would like to install, upgrade or add wiring to?
For ports Delft Circuits recommends choosing from our wiring ports solution, if you want to fill a single port with more cables or get a lower heatload etc. etc. and already know exactly what cables you want pick the Wiring ports option. if you want a hassle free solution with installation, service, calibration. We recommend going for the turn-key solution and see what else we can do for you.
Delft Circuits recommends
Wiring ports
Delft Circuits recommends
Turn-key
For ports Delft Circuits recommends choosing from our wiring ports solution, if you want to fill a loader with more cables or get a lower heatload etc.. If you want a hassle free solution with installation etc. etc. we recommend going for the turn-key solution and see what else we can do for you
Delft Circuits recommends
Delft Circuits recommends
If you are building a new system we recommend looking at everything we have to offer for you, next to just I/O we can help you design, help you optimize, do cryogenic calculations, calibrations and much more.
Delft Circuits recommends
Wiring ports
Have a spare port in your fridge and want to add extra lines or replace an existing wiring port with a higher density cabling solution?
We supply vacuum feedthroughs, Thermal clamps, Brackets and Cri/oFlex® laminates for all standard ports you will find in dilution refridgerators.
- Fits for all standard ports
- Out of the box solution
- Upgrade existing systems
Loaders
Delft Circuits can supply fully pre-assembled loaders with Cri/oFlex® cabling inside.
We supply top- and sideloaders for all common brands such as Bluefors, Oxford and Leiden Cryogenics.
The advantages of pre-assambled loaders:
- More channels in a loader
- Plug and play cabling solution
- Engineered for your application
Turn-key
Trying to lead the way in the quantum revolution? We can match your pace in cabling solutions.
Outfitting full systems with cutting edge I/O solutions. Massively scaling cabling solutions for everyone that needs the edge in the quantum race.
Our options:
- Full-service provider
- Full fletched solutions
- Innovative design
Dive deeper into
Cri/oFlex® technology
Learn all about what makes our technology specially fitted for the quantum industry
