The novel device could lead to more versatile quantum processors with clearer outputs. What good is a powerful computer if you can’t read its output? Or readily reprogram it to do different jobs? People who design quantum computers face these challenges, and a new device may make them easier to s
Scientists at NIST have introduced a “toggle switch” device for quantum computers that adjusts connections between qubits and a readout resonator. The device tackles challenges like noise and reprogramming limitations, paving the way for more flexible and accurate quantum computing.What good is a powerful computer if you can’t read its output? Or readily reprogram it to do different jobs? People who design quantum computers face these challenges, and a new device may make them easier to solve.
This photo shows the central working region of the device. In the lower section, the three large rectangles represent the two quantum bits, or qubits, at right and left and the resonator in the center. In the upper, magnified section, driving microwaves through the antenna induces a magnetic field in the SQUID loop . The magnetic field activates the toggle switch. The microwaves’ frequency and magnitude determine the switch’s position and strength of connection among the qubits and resonator.
Such static architectures have another disadvantage: They cannot be reprogrammed easily. A static architecture’s qubits could do a few related jobs, but for the computer to perform a wider range of tasks, it would need to swap in a different processor design with a different qubit organization or layout. The team’s programmable toggle switch sidesteps both of these problems.
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