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Advanced sample holder systems

The QBoard

QBoard is a modular, PCB-based sample holder system for low-temperature electronic devices, such as spin-qubit chips and superconducting circuits. It has 48 DC/low-frequency channels and 16 high-frequency channels (GHz) and offers excel­lent thermalization down to millikelvin.

QBoard is based on a multi-board design for multiqubit devices1) which is used for example at the University of Sydney and the University of Copenhagen (Center for Quantum Devices). It consists of a motherboard, a daughterboard (which serves as a chip carrier), an interposer, a mounting bracket, plus all necessary cables for connecting the QBoard to the cold finger of a typical dilution refrigerator (or to the inside of cryostat’s measurement insert).

With this optimized, tested and well documented system you do not need to spend valuable research hours on designing and manufacturing chip carriers and connectors for contacting your quantum chip.

QBoard cryogenic sample holder system from QDevil

QBoard with mounted daughterboard. The 51 pin nano-D connectors are seen on the top side. The 16 mini-coax connectors are located in two rows on bottom side.

Summary

  • Motherboard with two 51-pin nano-D connectors wired in parallel, facilitating sample check in bot­tom-loader cryostats or grounding during connection.
  • Made of non-magnetic materials.
  • Daughterboards for sample mounting via wire bond­ing. Daughterboards are inexpensive – no more need to unbond good samples!
  • Daughterboards are prepared for mounting of resona­tor circuits for reflectometry.
  • 48 RC-filtered low-frequency lines.
  • 16 RF lines with two 8-pin mini-coax connectors.
  • 16 bias tees on motherboard for all RF lines.
  • Mounting bracket for inserts of popular dilution refrig­erators. QDevil supplies CAD files for customers who need to make their own brackets.

QBoard Compact

Qboard Compact cryogenic sample holder system fro QDevil

QBoard Compact sample holder board mounted on a bracket suitable for 43 mm (or larger) sample inserts. The nano-D connectors for the 48 low-frequency lines are on the bottom side, the 14 RF connecters on the top.

The QBoard has a smaller sibling, QBoard-Compact, which can fit into very small sample inserts. It can for example be fitted into a 43 mm Oxford Triton insert.  The QBoard Compact features:

  • Motherboard with two 51-pin nano-D connectors wired in parallel, facilitating sample check in bot­tom-loader cryostats or grounding during connection.
  • Made of non-magnetic materials.
  • Daughterboards for sample mounting via wire bond­ing. Daughterboards are inexpensive – no more need to unbond good samples!
  • 48 low-frequency lines
  • Up to 14 RF lines with two 8-pin mini-coax connectors
  • Mounting bracket for inserts of popular dilution refrig­erators. QDevil supplies CAD files for customers who need to make their own brackets.

 

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