Feature: Power
in relation to their mass, giving excellent heat transfer capabilities and making them ideal for ballast load applications. Te construction is designed to maximise
the use of convection air for ventilation, providing the longest possible lifespan for the load banks elements. Tey provide a practical and efficient solution for managing ballast loads in various applications, ensuring that power systems remain stable and reliable while minimising the need for additional equipment and space. Ballast loads are a useful tool for keeping
power systems stable and efficient. Radiator- mounted load banks, with their compact design and seamless integration, provide a simple solution to use this technique, enhancing reliability and optimising space for applications where space is a premium. For industries looking to improve power system stability, these load banks offer an efficient way to maintain the system’s equilibrium.
For more information on Power Prove’s radiator mounted load banks, please visit the website.
Using Quobly’s strategy to build qubits with FD-SOI technology, readout architecture ‘provides a path to low power and scalable quantum’ ICs By CEA-Leti, Research Institute for Electronics and Information Technologies
C
EA-Leti, in its collaboration with Quobly, CEA-List and CEA-Irig, reported today it has developed a unique solution using
FD-SOI CMOS technology that provides simultaneous microsecond readouts of tens of quantum devices, while reducing the readout power consumption by 10x and footprint by 2x. Combined with Quobly’s strategy to
build qubits out of FD-SOI technology, this readout architecture provides a path to low power and scalable quantum integrated circuits. In a paper presented at ISSCC
2025, ‘An 18.5μW/qubit Cryo-CMOS Charge-Readout IC Demonstrating QAM Multiplexing for Spin Qubits,’ the innovation is to propose a readout circuit based on a capacitive-feedback transimpedance amplifier (CTIA) that achieves an 18.5μW/qubit power consumption, which is a significant tenfold reduction compared to existing, similar circuits at half the footprint per qubit. With this circuit, CEA-Leti demonstrated a 4- and 16-point
quadrature-amplitude modulation (QAM), that increases the possible number of multiplexed devices by directly using the quantum devices as a modulator. A capacitive-feedback transimpedance
amplifier converts the current coming from the quantum devices into an output voltage. Its gain can be set by adjusting the ratio of the values of the two capacitances of its feedback loop. Te novel system presented minimizes
power consumption with a multiplexing strategy that permits measurement of several qubits with one amplifier. Tis paves the way toward developing the readout of thousands of silicon qubits with
a limited number of wires and without the need of bulky inductors, circumventing both the wiring bottleneck and the readout scaling-up limitation of actual cryogenic electronics. Tis highly collaborative effort reported
at ISSCC was made possible by the unique expertise based in Grenoble. CEA-List offers invaluable guidance to ensure compatibility with future quantum soſtware stacks, while CEA-IRIG provides a one-of-a-kind cryogenic experimental platform. Trough their special partnership with Quobly, all divisions of CEA are positioned to pioneer significant breakthroughs in silicon qubit systems.
www.electronicsworld.co.uk February 2025 29
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