A Breakthrough Chip Enables Scalable Quantum Control
Led by Jake Freedman, Matt Eichenfield, and researchers from Sandia National Laboratories, a novel optical device has been created to dramatically boost the scalability of quantum computing by efficiently governing the lasers that drive thousands of qubits. Published in Nature Communications, the innovation uses vibrations at microwave frequencies—billions of cycles per second—to steer laser light with remarkable precision inside a device that is nearly 100 times smaller than a human hair. This approach tackles the drawbacks of traditional, bulky, power-hungry setups and points toward a practical path for manufacturing scalable optical frequency control, a cornerstone for future quantum computers and quantum networking technologies.
In essence, the team has introduced a compact optical phase modulator that directly addresses a key bottleneck in scaling quantum processors. By enabling efficient management of the lasers required to operate vast arrays of qubits, the device achieves precise laser frequency control through microwave-driven, high-speed vibrational effects, producing the new light frequencies essential for quantum computing, sensing, and communications.
A standout feature is that the device is fabricated with CMOS processes—the same technology used to manufacture everyday electronics like smartphones and laptops. This compatibility is crucial for mass production, because current solutions rely on large, energy-hungry components that aren’t feasible for scaling to thousands or millions of optical channels. The device uses about 80 times less microwave power than many commercial modulators, which minimizes heat output and enables much tighter chip integration. Collectively, these advantages bring the prospect of a truly scalable photonic platform for quantum technologies closer to reality.
Looking ahead, the researchers aim to merge frequency generation, filtering, and pulse shaping onto a single chip and plan to test these devices in collaboration with quantum computing companies, including implementations in trapped-ion and trapped-atom systems. The team views this technology as a potential final puzzle piece for controlling extremely large qubit systems and as a stepping stone toward what they describe as an “optical transistor revolution,” shifting away from bulky off-chip optics toward compact, integrated photonics.
Efficient Frequency Control for Qubit Operation
This breakthrough directly tackles the essential need for streamlined frequency control to operate quantum computers at scale. Today’s methods depend on large, bench-top setups that are impractical for scaling to the tens or even hundreds of thousands of optical channels demanded by future machines. The new approach uses microwave-frequency vibrations to shape laser light with high stability and efficiency, enabling precise qubit control in both trapped-ion and trapped-atom platforms.
By slashing microwave power usage—around an 80-fold improvement over many commercial modulators—the device reduces heat and supports denser chip layouts. This is a critical enabler for scaling, as building a quantum computer requires meticulous laser frequencies that differ by billionths of a percent to manipulate individual atoms. The present technology promises a scalable path beyond the limitations of conventional, bulky optical components.
A major strength of the work lies in adopting CMOS fabrication, which leverages a well-established, high-volume manufacturing ecosystem. This means thousands or even millions of identical photonic devices could be produced, a key prerequisite for a truly scalable photonic quantum computer.
The ability to generate new laser frequencies with exacting precision is among the most important tools for atom- and ion-based quantum systems. By harnessing this capability within a CMOS-compatible, miniature device, the researchers are pushing quantum hardware closer to mass deployment.
Jake Freedman
CMOS Fabrication for Mass Production of Photonic Devices
The team’s ingenuity centers on a CMOS-made device that could unlock larger quantum computers by avoiding bespoke, complicated builds. The result is a device roughly 100 times thinner than a strand of hair, capable of efficiently steering the lasers needed to operate thousands or even millions of qubits—the basic units of quantum information.
This device manipulates laser light with precision through microwave-frequency vibrations that occur billions of times per second. It also produces new light frequencies via efficient phase modulation while consuming about 80 times less microwave power than many commercial modulators. The power savings reduce heat and allow denser integration of optical channels, which is essential for scaling quantum systems.
According to Professor Eichenfield, CMOS fabrication represents one of the most scalable technologies humanity has developed, given that billions of identical transistors already populate modern electronics. By leveraging this vast infrastructure, the team envisions producing thousands or even millions of identical photonic devices, a necessary step toward a scalable, integrated photonic platform for quantum computing. This approach holds the promise of dramatically advancing scalable, on-chip photonics for quantum technologies.
