FEATURE
In a study published in Nature, the researchers demonstrated a working array of 40 optical cavities, each holding a single atom qubit, as well as a prototype device containing more than 500 cavities. Together, these results point toward a viable strategy for scaling quantum systems to the millions of qubits expected to be necessary for outperforming classical supercomputers.
“ If we want to make a quantum computer, we need to be able to read information out of the quantum bits very quickly,” said Jon Simon, professor of physics and applied physics and senior author of the study.“ Atoms don’ t naturally emit light fast enough, and when they do, it goes in every direction. Our approach solves both of those problems at once.”
At the heart of the work is a rethinking of the optical cavity, a structure formed by reflective surfaces that cause light to bounce back and forth. Optical cavities have long been used to enhance interactions between light and matter, but traditional designs rely on many reflections between mirrors, which can be difficult to engineer at scale.
The Stanford team instead introduced microlenses into each cavity, focusing light tightly onto individual atoms and extracting useful quantum information with fewer bounces.
This new architecture represents a departure from decades of cavity design. Rather than pushing light to circulate endlessly, the system emphasizes efficiency, alignment and scalability. Each atom is paired with its own cavity, allowing the entire array to function as a massively parallel readout device.
The need for such precision arises from the very nature of quantum information.
Atoms don’ t naturally emit light fast enough, and when they do, it goes in every direction. Our approach solves both of those problems at once.
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