Quantum networks—where entanglement is distributed across distant nodes—promise to revolutionize quantum computing, communication, and sensing. However, a major bottleneck has been scalability, as the entanglement rate in most existing systems is limited by a network design of a single qubit per node. A new study, led by Prof. A. Faraon at Caltech and conducted by A. Ruskuc et al., recently published in Nature (ref: 1-2), presents a groundbreaking solution: multiplexed entanglement using multiple emitters in quantum network nodes. By harnessing rare-earth ions coupled to nanophotonic cavities, researchers at Caltech and Stanford have demonstrated a scalable platform that significantly enhances entanglement rates and network efficiency. Let's take a closer look at the two key challenges they tackled—multiplexing to boost entanglement rates and dynamic control strategies to ensure qubit indistinguishability—and how they overcame them.

Breaking the Entanglement Bottleneck via Multiplexing
One of the biggest challenges in scaling quantum networks is the entanglement rate bottleneck, which arises due to the fundamental constraints of long-distance quantum communication. When two distant qubits are entangled via photon interference, the rate of entanglement distribution is typically limited by the speed of light and the node separation distance. In typical systems with a single qubit per node, this rate scales as c/L (where c is the speed of light and L is the distance between nodes), leading to long waiting times between successful entanglement events. This severely limits the scalability of quantum networks.

Today, Amazon Web Services (AWS) announced Ocelot, a new quantum computing chip that can reduce the costs of implementing quantum error correction by up to 90%, compared to current approaches. Developed by the team at the AWS Center for Quantum Computing at the California Institute of Technology, Ocelot represents a breakthrough in the pursuit to build fault-tolerant quantum computers capable of solving problems of commercial and scientific importance that are beyond the reach of today's conventional computers.

AWS used a novel design for Ocelot's architecture, building error correction in from the ground up and using the 'cat qubit'. Cat qubits-named after the famous Schrödinger's cat thought experiment-intrinsically suppress certain forms of errors, reducing the resources required for quantum error correction. Through this new approach with Ocelot, AWS researchers have, for the first time, combined cat qubit technology and additional quantum error correction components onto a microchip that can be manufactured in a scalable fashion using processes borrowed from the microelectronics industry.

Intel and the Gordon and Betty Moore Foundation announced today that company co-founder Gordon Moore has passed away at the age of 94. The foundation reported he died peacefully on Friday, March 24, 2023, surrounded by family at his home in Hawaii. Moore and his longtime colleague Robert Noyce founded Intel in July 1968. Moore initially served as executive vice president until 1975, when he became president. In 1979, Moore was named chairman of the board and chief executive officer, posts he held until 1987, when he gave up the CEO position and continued as chairman. In 1997, Moore became chairman emeritus, stepping down in 2006.

During his lifetime, Moore also dedicated his focus and energy to philanthropy, particularly environmental conservation, science and patient care improvements. Along with his wife of 72 years, he established the Gordon and Betty Moore Foundation, which has donated more than $5.1 billion to charitable causes since its founding in 2000.

Western Digital Corp. today announced a significant step in the ongoing implementation of its diversified storage portfolio strategy by forming separate product business units for its Flash and HDD technology assets. The Flash business and the HDD business will each be led by a general manager and will align the company's diversified portfolio to an acceleration strategy designed for growth, profitability and development agility. By delivering both Flash and HDD market-leading innovation through highly focused product development organizations, Western Digital's strategy positions the company to leverage its strong go-to-market and operational synergies and uniquely address broad customer storage needs from edge devices to cloud infrastructure.

Also today, Western Digital announced the appointment of Robert Soderbery as executive vice president and general manager of its new Flash business unit. A thirty-year technology and business veteran, Soderbery is responsible for all Flash portfolio strategy, product development and business results and will lead engineering and product management teams focused on delivering the company's Flash innovation. The company confirmed an executive search is underway for a general manager who will lead its HDD product business.

There is a lot to say regarding patent applications and their defense, and the devious ways these can be used as a way to both stifle innovation, competition, and to leech other companies' funds with what is usually described as "patent troll" behavior. Being a seat of technological innovation, The California Institute of Technology (CalTech) registers patents as results of their attachés' work - some of these see the light of day as actual products, but more often than not, the patent rights are used as a way for the institute to receive funds from those that would license their intellectual property.

After entering a legal battle with Apple and Broadcom back in 2016, CalTech has now had its accusation of patent infringement against both companies come to a close, with the jury deciding in favor of the university. The accusation was of both companies deploying WiFi chips which were based on Caltech's patent designs - WiFi chips that were then shipped within millions of iPhones, iPads and MacBooks. As a result, both Apple and Broadcom were ordered to pay a total of $1.1 billion in compensation, with Apple taking the brunt of the decision ($837.8 million) and Broadcom coming in with a thinner slice at $270.2.