New setup for high-throughput electrical measurements of quantum materials and devices

New setup for high-throughput electrical measurements of quantum materials and devices
The setup, a cryogenic multiplexer platform, can test and validate multiple chips together in one cool-down at a temperature of 50 mK. Credit: M. Lodari for QuTech

QuTech, a collaboration between TU Delft and TNO, has demonstrated a novel setup for fast turnaround testing and validation of quantum materials and devices. The setup uses ordinary electronic chip components that can operate at extreme cryogenic temperatures, and can be readily integrated in any type of cryostat. The scientists published the details of their setup in an open-access journal npj Quantum Information, allowing research groups worldwide to modify their cryostat and greatly enhance its throughput.

Principal investigator Giordano Scappucci, together with first authors Paquelet Wuetz and Bavdaz and the rest of his team, have built a new setup that drastically cuts the time needed to develop quantum materials and devices. The setup increases the number of wires that can operate at cryogenic temperatures in the by an order of magnitude, while keeping the same number of wires operating at room . This is an important accomplishment for the electrical measurement of large quantum systems, where a limited number of wires operating at cryogenic temperatures can form an input/output bottleneck. The new cryogenic also holds promise for scaling-up quantum technology due to its capacity to test and validate multiple chips together.

To prove the value of the setup, the scientists, in collaboration with Intel, used the cryogenic platform to accelerate the industrial development of "strained-silicon quantum wells": thin layers of semiconductor silicon stretched and sandwiched between layers of silicon-germanium. The scientists trapped electrons in these quantum wells and then measured the electrical transport properties of these electrons at extreme . The investigated material platform showed remarkable properties for making high-quality spin qubits, which form the for a spin-based quantum computer.

The cryogenic multiplexer platform is easy to integrate in any kind of cryostat and is based on a common off-the-shelf CMOS multiplexer (an ordinary chip component that controls its output signal based on the input signals that it receives). The details of the platform have been published in an open-access journal. By doing so, they want to empower research groups worldwide to dramatically augment the throughput of their cryostat at negligible cost.

New setup for high-throughput electrical measurements of quantum materials and devices
The setup for high-throughput electrical measurements. Credit: M. Lodari for QuTech

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Cryo-chip overcomes obstacle to large-scale quantum computers

More information: B. Paquelet Wuetz et al. Multiplexed quantum transport using commercial off-the-shelf CMOS at sub-kelvin temperatures, npj Quantum Information (2020). DOI: 10.1038/s41534-020-0274-4
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Citation: New setup for high-throughput electrical measurements of quantum materials and devices (2020, May 19) retrieved 28 May 2020 from https://phys.org/news/2020-05-setup-high-throughput-electrical-quantum-materials.html
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