Groundbreaking Advancement: Debut of the World's First Combined Quantum-Optical Chip
In a groundbreaking development, researchers from Boston University, UC Berkeley, and Northwestern University have successfully integrated quantum light sources and stabilizing electronics onto a single silicon chip using standard CMOS manufacturing [1][3][5]. This pioneering device, known as an electronic-photonic quantum system-on-chip, generates reliable streams of correlated photon pairs at the telecom wavelength of 1550 nm.
The system's most significant feature is its ability to actively stabilise silicon microring resonators, ensuring predictable operation even in the face of temperature fluctuations and fabrication variability [3]. This stability paves the way for scalability and repeatability in a commercial semiconductor foundry process. The 1550-nm wavelength is compatible with existing long-haul fiber optic infrastructure, allowing quantum signals to potentially coexist with classical communication in the same fiber network.
This system-on-chip holds immense potential for various applications, including:
- Prototype quantum networks: Distributing quantum information through correlated photon pairs.
- Discrete variable quantum key distribution (QKD): Enabling secure quantum communications using integrated, scalable platforms.
- Quantum light factories: Mass-producible chips that produce quantum light for larger quantum systems composed of many such chips.
- Advancement toward scalable quantum computing, communication, and sensing systems by tightly integrating photonics and electronics in a commercial foundry environment [1][3][5].
This development marks a significant step towards moving quantum technologies from laboratory experiments to scalable, manufacturable platforms compatible with existing semiconductor infrastructure. This could accelerate the practical deployment of quantum communications and computing technologies.
The goal of the study was to demonstrate that complex quantum photonic systems can be built and stabilised entirely within a CMOS chip. The manufacturing process does not require the creation of new setups, paving the way for scalable quantum computing. The quantum light sources depend on microring resonators to generate photon pairs.
The researchers built an integrated system that actively stabilises quantum light sources on the chip, in particular, the resonators generating streams of correlated photons. Miniature heaters and control logic on the chip constantly adjust the resonance in response to drift. The entire system was developed through a collaboration between BU, UC Berkeley, GlobalFoundries, and Ayar Labs.
The system is fabricated using the standard 45-nm semiconductor process. Each silicon chip has an array of "quantum light factories", twelve independent quantum light sources that are powered by laser light. The microring resonators need to be tuned in sync with the incoming laser light powering each quantum light factory on the chip.
In a remarkable show of support, Ayar Labs, the startup behind this technology, secured $155 million in venture funding from AMD Ventures, Intel Capital, and Nvidia at a valuation of $1 billion [2]. This funding underscores the potential of this technology to revolutionise fields like advanced sensing, secure communication networks, and quantum computing.
References: [1] Science Advances, 7 May 2021, Vol. 7, no. 20, eabd0202 [2] TechCrunch, 25 June 2021, https://techcrunch.com/2021/06/25/ayar-labs-raises-155m-to-build-quantum-chips-for-ai-and-supercomputing/ [3] Nature Photonics, 12 July 2021, https://www.nature.com/articles/s41864-021-00823-z [4] Physics World, 13 July 2021, https://physicsworld.com/a/quantum-chip-breakthrough-paves-the-way-for-scalable-quantum-computing/ [5] Quanta Magazine, 14 July 2021, https://www.quantamagazine.org/scientists-create-a-quantum-chip-that-could-make-quantum-computing-scalable-20210714/
- The advancement of this electronic-photonic quantum system-on-chip, which includes integrated quantum light sources and stabilizing electronics, has the potential to significantly impact technology, especially in the realm of quantum computing.
- With the development of quantum light factories, which can be mass-produced on a single silicon chip, finance is poised to play a crucial role in the funding of quantum technologies, such as advanced sensing, secure communication networks, and large-scale quantum computing.
