Delft Circuits · Cri/oFlex®
Cri/oFlex®: eight lines on a 0.3 mm flex
Delft Circuits' superconducting flex cabling carries qubit control and readout, bias and signal lines from room temperature to the coldest stage, with filtering and attenuation built into the flex. Supplied in ASEAN by Paeonia Bloch.
General properties
Cri/oFlex® at a glance
As published by Delft Circuits.
- Channels per flex 8
- Thickness 0.3 mm
- Materials Polyimide + Ag / NbTi
- Line type Stripline
- Impedance 50 Ω
- Frequency range DC – 18 GHz
- Bend radius 5 mm
- Microwave loss, NbTi 1.5 dB/m at 6 GHz
- Contact resistance < 10 mΩ
Filtering in the flex, not in the fridge
Attenuators, low-pass filters and IR filters are integrated into the flex itself rather than added as separate components on each plate. Delft builds attenuation from –5 dB unit cells, low-pass filters commonly at 1, 8 or 12 GHz, and IR filters with a slope of –1 or –1.5 dB/GHz. Fewer discrete parts means fewer connections; Delft Circuits puts it as ten times fewer points of failure.
Line types
One flex family, five jobs
Line configurations as published by Delft Circuits.
Flux bias line
- Low-pass filter 1 GHz
- Attenuation –20 dB
- IR filter –1.5 dB/GHz
- Use Bias signals up to 1 GHz NbTi flex
Microwave drive line
- Low-pass filter 8 GHz
- Attenuation –50 dB
- IR filter –1 dB/GHz
- Use Feed, drive and pump 6–8 GHz operating range
Signal line
- Integrated components None
- Materials Ag, NbTi
- Lengths 300, 500, 700, 1000, 1200 mm
Readout and pump lines
For readout, Delft Circuits combines its own return and pump lines with selected third-party active and isolating components; the pump line is a slight modification of the microwave drive line. The exact chain depends on your amplifier and isolator choice, so we configure it with Delft for each system.
Connectors and anchoring
HD SMP connectors
High-density flex-to-coax connection. HD SMPM, SMA (robust, up to 18 GHz) and SMP are also available.
Thermal clamps
Up to 80 channels per clamp, precision-milled gold-plated copper.
Tabbi® connector
Flex-to-flex, ultra-high density, modular configuration.
Cri/oFlex® questions
What frequency range does Cri/oFlex® cover?
DC to 18 GHz, on 50 Ω stripline.
Silver or NbTi?
NbTi is superconducting at cryogenic temperatures and is the low-loss, low-heat option for the cold stages (1.5 dB/m at 6 GHz). Silver is available too. The right mix depends on the stage and the line; we configure it with Delft Circuits.
Will it fit my cryostat?
Cri/oFlex® is delivered as complete I/O systems for standard vacuum ports (Ø108 mm, ISO-K63, KF40, KF25). Tell us the cryostat and port and we will confirm the fit before quoting. See I/O systems.
Datasheet
Request the Cri/oFlex® datasheet
An engineer will send Delft Circuits' current datasheet, usually within one business day.
How many lines do you need?
Tell us the line types, counts and cryostat. We will come back with a Cri/oFlex® configuration and quotation.