Nordic Cryogenic Quantum Collaboration

Friday March 5th 2021

Bluefors, manufacturer of dilution refrigerators, and QDevil, manufacturer of electronics and devices for quantum electronics experiments entered on March 2nd, 2021 an agreement whereby QDevil’s high performance cryogenic QFilters can now be pre-installed in Bluefors’ state of the art dilution refrigerators.

 “We are excited to announce our collaboration with Bluefors” says the CEO of QDevil Jonatan Kutchinsky, who also states that the two companies have the same mindset in common with a focus on customers and quality. “Together with Bluefors, being a major player within the dilution refrigerator business, the customers will experience a higher degree of product integration and enhanced performance thus further accelerating research within quantum electronics.”

In essence, the QFilter is a multistage 24 channel low pass filter attenuating from 65 kHz. In addition, it has an outstanding thermalization of electrons below 100 mK.

Based on research at Harvard University and the University of Copenhagen, the QFilter, is an electron thermalizing low-pass filter well described in the literature. It can bring the electron temperature down to just 5 – 10 mK above the fridge base temperature.

It is designed for easy mounting on the mixing chamber plate in dilution refrigerators and is presented in a flexible design making it possible to stack or piggy tail multiple filters for higher channel counts. The QFilter is compatible with high magnetic field environments and can therefore be placed even close to the superconducting magnet in a dilution refrigerator. The signal lines are thermally anchored to non-magnetic gold-plated copper brackets and are interfaced with non-magnetic shielded 25-pin microD connectors.

QDevil has recently published an application note that very thoroughly describes how, by using the QFilter, a low electron temperature has been achieved in a real-life experiment performed at the Center for Quantum Devices at the Niels Bohr Institute – University of Copenhagen, Denmark.

For more information about the application note, click here.

To read more about the collaboration, click here.