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QFilter

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Ensuring low electron temperature in quantum devices
QDevil has the aim of enhancing the science in quantum electronics labs, by enabling scientists to focus their effort on the science, instead of constructing auxiliary equipment that already has been developed in other labs.

QFilter
configuration

The QFilter is a multi-stage low-pass filter, to achieve low electron temperature and good noise performance inside cryofree dilution refrigerators and conventional cryostats.

  • Compatible with low temperatures and high magnetic fields
  • Each assembly contains one RC filter board and one RF filter board, filtering 24 lines in parallel
  • Easy mounting on the cryostat plates
  • Connectors: Non-magnetic micro-D, female input/male output
  • Thermally anchored to non-magnetic gold-plated copper brackets
  • Multiple filters can be stacked on each other to expand number of channels and/or improve filter characteristics
Configuration of
RC low-pass filter
  • 24-channels on one PCB board
    • each filtered in three stages
  • 1st stage: 7-pole pi filter
    • cut off frequency 80 MHz
  • 2nd stage: RC low-pass filter
    • R=500 Ω and C=2200 pF
  • 3rd stage: RC low-pass filter
    • R=1200 Ω and C=1000 pF
Configuration of
RF low-pass filter
  • 24-channels on one PCB board
    • each filtered in three stages
  • 1st stage: 7-pole pi filter
    • attenuates above 80 MHz
  • 2nd stage: 7-pole pi filter
    • attenuates above 1.45 GHz
  • 3rd stage: 7-pole pi filter
    • attenuates above 5 GHz

Other Products

Specialized for quantum electronics applications

QFilter
QBox – Breakout Boxes
QBoard – Advanced Sample Holder
QDAC – Gate Controller DACs

Contact Us

Get a quote

QDEvil ApS
Fruebjergvej 3
DK-2100 Copenhagen
Denmark

sales@qdevil.com
www.qdevil.com

CVR/VAT no. DK37786268

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About the QFilter

The QDevil cryogenic filter is designed to significantly improve the usefulness of dilution refrigerators for those measuring electrical properties of materials or electronic systems.

Due to the suppression of electron-phonon coupling at low temperatures and sensitivity to electrical noise, the temperature of the electrons in the device under test is typically higher than the mixing chamber temperature. In fact, it is very challenging to obtain an electron temperature as low as the phonon temperature, and hence commercially available cryostats do not specify their cooling performance with regards to electron temperature.

However, for many researchers it is the electron temperature in the signal lines as well as the electrical noise environment that is most important, for example for the performance of qubits and other low-temperature electronic devices.

Meet Us

Our customer relations team

QDevil has the aim of accelerating the science in quantum electronics labs, by letting scientists focus their effort on the science, instead of constructing auxiliary equipment that already has been developed in other labs.

We are all experienced with cryogenic electronics science, and we will do our best to help you with picking the right components for your lab.

Jonatan kutchinsky

CEO & Co-founder

Ferdinand Kuemmeth

CTO & Co-founder

Anders Kühle

Product Manager

Merlin von Soosten

Product Scientist

This project has received funding from the European Union’s Horizon 2020 research and innovation programme under grant agreements No. 868058 and 946372.