Superconducting quantum computing is widely viewed as one of the most promising platforms for next-generation computation, but scaling it to practical systems remains difficult. Today's architectures rely on many cables linking room-temperature electronics to processors sitting near absolute zero, creating severe space and cooling constraints inside dilution refrigerators. Cryogenic multiplexers have been proposed as a solution, yet existing switch technologies often face tradeoffs in insertion loss, isolation, manufacturability, or long-term reliability under extreme cold. Because large quantum systems will demand both efficient signal routing and durable operation, there is a strong need to investigate switch technologies that can truly function in cryogenic environments.
Researchers from Purdue University and Menlo Microsystems reported (DOI: 10.1038/s41378-026-01178-4) these findings in Microsystems & Nanoengineering on February 28, 2026, in a study evaluating a commercial single-pole four-throw MEMS switch for quantum computing applications. The team tested whether an existing RF MEMS device could meet the harsh electrical, thermal, and reliability demands of cryogenic multiplexing, and found that its performance remained robust—and in some aspects improved—at around 5.8 K.
The researchers combined finite element simulations with cryogenic electrical and RF measurements to assess how the switch behaves in deep-cold conditions. Simulations showed only minimal structural deflection as temperature dropped, helping preserve stable switching behavior. Experiments confirmed that the pull-in voltage decreased by about 3.1% at cryogenic temperature, while on-resistance fell by about 15.3%, an improvement linked to reduced phonon scattering in metals. In RF tests, insertion loss stayed below 0.5 dB across the key 4–8 GHz qubit frequency range, and isolation exceeded 35 dB, both favorable for quantum signal routing. The team also uncovered a major low-temperature challenge: severe bouncing caused by quasi-vacuum conditions inside the package. To solve it, they designed a dual-pulse gate waveform that reduced cantilever impact velocity, suppressing oscillation and enabling stable dynamic operation with a switching time of about 3.3 microseconds. With that waveform, the device ran for more than 100 million cycles without observable degradation. The team further demonstrated stable SP4T signal routing and even NAND and NOR logical operations at cryogenic temperature, showing that the switch could serve as more than a simple on-off component.
The authors conclude that commercial MEMS switches are a promising candidate for cryogenic multiplexers in large-scale quantum systems because they combine near-zero static power consumption, strong RF characteristics, and reliable low-temperature operation. At the same time, they note that challenges remain, especially dielectric charging and stiction at higher switching frequencies, which will require further materials and design optimization for future control-multiplexing applications.
The implications extend beyond a single device test. If commercial MEMS switches can be integrated into cryogenic multiplexers, they could reduce wiring complexity between room-temperature electronics and quantum processors, easing one of the central engineering barriers to million-qubit systems. Their compatibility with low-power operation and high-isolation signal routing makes them particularly attractive for next-generation quantum hardware. With further improvements in speed and reliability, such switches may become enabling infrastructure for scalable quantum computing, turning interconnect design from a bottleneck into a bridge.
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References
DOI
10.1038/s41378-026-01178-4
Original Source URL
https://doi.org/10.1038/s41378-026-01178-4
Funding information
This research was developed with funding from the Asian Office of Aerospace Research and Development (AOARD) under the award FA2386-21-1-4088.
About Microsystems & Nanoengineering
Microsystems & Nanoengineering is an online-only, open access international journal devoted to publishing original research results and reviews on all aspects of Micro and Nano Electro Mechanical Systems from fundamental to applied research. The journal is published by Springer Nature in partnership with the Aerospace Information Research Institute, Chinese Academy of Sciences, supported by the State Key Laboratory of Transducer Technology.