• Tune the energy gap between computational states • Tunable couplers • Apply general Baseband pulses or signals

• Low frequency bias signals • Minimising active & passive thermal load • Lossless DC bias current • Ultra low noise

• 8 Channels per flex • 1 GHz low-pass filter • 20 dB distributed attenuation • NbTi Superconducting lines

Flux Bias Lines

Control Your Qubits!

Flux lines for superconducting qubits provide signals to tune qubits or tunable couplers. The key requirements to these lines are, short risetimes as well as low (contact) resistance to reduce both active and passive heating.

View details

Only available NbTi flex in the world

Low pass filter at 1 GHz

Integrated IR (infrared) filter

Inline attenuation of 20 dB

Contact resistance of 10 mΩ

Technical Data

General Specifications	Unit
Vacuum feedthrough leak rate	< 10-9 mbar L/s
Vacuum feedthrough connection	KF25/40, ISO 100 side and top loader ports
Required length for 180° longitudinal rotation	10 mm
Minimum bending radius	5 mm
Primary flex materials	Polyimide, NbTi
Connector type	SMA female / SMP
Transmission type	Stripline
Number of channels	8
Applications	Qubit flux for superconducting qubits or similar
Operating temperature	0 K to 400 K (gradient)
Storage temperature	0 K to 320 K

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The product is provided with coaxial SMA/SMP connector blocks to interface to the room-temperature electronics and the chipholder at the mK stage. Vacuum feedthroughs are designed to carry multiple flexes and are compatible with most fridge types. The chain of integrated attenuators and low pass filters is configured for flux bias currents, shielding the bias loop from undesired high frequency noise while allowing short risetimes. Below the 100 mK plate, integrated infrared filtering is positioned and thermalized with a slope of -1.5 dB/GHz to further filter out high frequency radiation.

The passive heatload is 600 pW per channel at 10 mK due to the superconducting material used.

A flux line I/O chain allows base-band (0-2 GHz) access to your circuit, typically terminated by an inductive component on your chip like a flux loop. With a DC bias current one tunes the frequency of the qubit or the magnitude of the coupler. In time domain one can tune this in nanosecond timescale.

The Cri/oFlex® flux line is configured completely for this task. With a low pass filter at 1 GHz, a 20 dB attenuator, and a strong IR-filter, this setup allows you to control your qubit without opening unwanted noise channels.

System Integration

There is a wide variety of cooling solutions for quantum computing and low temperature experiments, ranging from lab size dilution refrigerators to small 4K table-top systems. As an i/o provider, it is our task to connect quantum devices and cold experiments to the control electronics regardless of the cooling implementation. To that end we have developed standardized solutions that fit (or can be made to fit) all fridges.

Whether you are purchasing a new system or want to refurbish your current system, Cri/oFlex® provides a solution.

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.

Out of the box solution

Fits for all standard ports

Upgrade existing systems

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Customer applications

Blazed Gratings at various angles from 10 to 70 degrees.

DWL 66+ exposure of concentric rings with a linewidth of approximately 200 nm and a pitch of 700 nm in positive photoresist.

Pushing the limits with Write Mode XR – lines and spaces with 400 nm pitch.