New research: Qubits sharing the same cable

Researchers at Chalmers have developed a new method to solve one of the major challenges for quantum computing power—the need for a large number of cables—by letting multiple qubits share the same cable. The method, known as time-domain multiplexing, controls qubits in rapid succession using fewer cables and microwave switches to direct signals. The study, published in PRX Quantum, shows the number of cables can be drastically reduced without significantly increasing computation time; for some operations, like two-qubit gates, sharing can occur with no extra time cost at all. The increased computation time scales logarithmically rather than linearly, meaning the performance impact is much smaller than feared, pointing to cable sharing as a key component for scaling up future quantum computers