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Wiring a new path to scalable quantum computing

This schematic image of integrated superconducting qubits and their packaging,shows the qubits as green dots with rings, which are laid out on top of a silicon chip (in red). A number of holes through the chip electrically connect the top and bottom surfaces. The blue wires on top are circuit elements for the readout of the qubits. Coaxial wiring (with gold-plated springloaded pins) is connected to the backside of the chip, and these control and read the qubits. Credit: Yutaka Tabuchi Last year, Google produced a 53-qubit quantum computer that could perform a specific calculation significantly faster than the world’s fastest supercomputer. Like most of today’s largest quantum computers, this system boasts tens of qubits—the quantum counterparts to bits, which encode information in conventional computers.

To make larger and more useful systems, most of today’s prototypes will have to overcome the challenges of stability and scalability. The latter will require increasing the density of signaling and wiring, which is hard to do without degrading the system’s stability. I believe a new circuit-wiring scheme developed over the last three years by RIKEN’s Superconducting Quantum Electronics Research Team, in collaboration with other institutes, opens the door to scaling up to 100 or […]

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