Silicon photonic integrated circuit developed by ORNL scientists combines a bidirectionally pumped microring resonator with polarization splitter-rotators to generate broadband, high-fidelity polarization-entangled photons across 116 frequency-bin pairs compatible with existing fiber-optic networks, marking a significant advancement toward a scalable quantum internet.
The research demonstrates a breakthrough Gaussian modulated coherent state continuous-variable quantum key distribution system that operates effectively in daylight and rainy conditions over an 860-meter free-space link, achieving high secure key rates without complex filtering by using a 1550 nm wavelength and polarization-multiplexed local oscillator, significantly advancing practical quantum communication applications.
Chinese and South African scientists have established the world’s longest quantum satellite link spanning nearly 13,000 kilometers, demonstrating unbreakable encryption using quantum key distribution to securely transmit images between continents in a groundbreaking collaboration that marks the first quantum satellite communication in the Southern Hemisphere.
A quantum internet protocol using minimum cost aggregation and network concatenation enables efficient distribution of entangled bits with bounded error between arbitrary clients across multiple quantum networks regardless of distance, overcoming previous limitations and forming the necessary foundation for global-scale quantum networking.
Researchers from the Quantum Internet Alliance have created QNodeOS, the first operating system for quantum networks, which abstracts hardware complexity to enable easier development of quantum networking applications across different hardware platforms, marking a crucial step toward making quantum internet technology accessible and practical.
Researchers have achieved a breakthrough in quantum teleportation by using ancillary photonic states to surpass the 50% Bell-state measurement success probability limit of linear optics, demonstrating an impressive 69.71% acceptance rate with high fidelity (0.8677) on arbitrary input states from independent sources, representing the first practical implementation of Boosted Quantum Teleportation with significant implications for quantum repeaters, communications, and computation.
Researchers have achieved a breakthrough in quantum networking by creating a two-node system with multiple rare-earth ions per node that enables multiplexed entanglement distribution and multipartite state preparation, overcoming traditional single-qubit limitations and laying the groundwork for scalable quantum networks with applications in computing, communication, and sensing.
IonQ is acquiring a controlling stake in quantum safe networking leader ID Quantique (IDQ) to strengthen its global quantum ecosystem, accelerate quantum networking development, and establish a strategic partnership with SK Telecom, with the acquisition expected to close in Q2 2025.
Scientists at Leibniz University Hannover have developed a cost-effective quantum network security system using frequency-bin coding of light particles, which reduces complexity and equipment costs by 75% while enhancing security against quantum computer threats through a simplified single-detector design that enables dynamic, scalable quantum key distribution.
Scientists at Oak Ridge National Laboratory successfully transmitted entangled quantum signals without interruption over a commercial fiber-optic network using automatic polarization compensation, marking a crucial advance toward practical quantum internet development.
ISTA physicists have developed a breakthrough method to connect superconducting qubits using fiber optics instead of traditional electrical signals, significantly reducing cooling requirements and potentially enabling the scaling and networking of quantum computers by converting optical signals to microwave frequencies that qubits can process.
A novel quantum key distribution encoder called MacZac combines Sagnac and Mach-Zehnder interferometers with a single phase modulator to achieve exceptionally low error rates and high stability in time-bin encoded quantum communications, while simplifying the optical setup and eliminating the need for active compensation.
Scientists have introduced and analyzed a high-dimensional QKD protocol that requires only standard two-dimensional hardware. They have provided security analysis against individual and coherent attacks, establishing upper and lower bounds on the secure key rates.
Northwestern University researchers discovered that quantum networks can be maintained by adding just the square root number of new connections relative to total users after each communication event, offering a surprisingly efficient solution to the challenge of quantum links disappearing once used.
A research team has developed a groundbreaking, compact frequency comb generator using lithium tantalate technology that achieves 450 nm spectral coverage with over 2000 comb lines while reducing power requirements twentyfold, potentially transforming applications from robotics to environmental monitoring.
Researchers at the University of Pennsylvania’s School of Engineering and Applied Science have developed a revolutionary photonic switch that transforms data transmission in fiber-optic networks. The switch, detailed in Nature Photonics, measures just 85 by […]
cientists at NIST and Chalmers University of Technology have developed a groundbreaking quantum refrigeration system that achieves record-low temperatures for quantum computing operations.
Extended quantum networks are based on quantum repeaters that often rely on the distribution of entanglement in an efficient and heralded fashion over multiple network nodes. Many repeater architectures require multiplexed sources of entangled photon […]
A new study opens the door to cutting-edge solutions that could contribute to the realization of a system capable of processing quantum information in a simple yet powerful way. The work presents a method for manipulating the photonic states of light in a never-before-seen way, offering greater control over the evolution of photon propagation. This control makes it possible to improve the detection and number of photon coincidences, as well as the efficiency of the system.
Researchers have developed a special type of amplifier that uses a technique known as squeezing to amplify quantum signals by a factor of 100 while reducing the noise that is inherent in quantum systems by an order of magnitude. Their device is the first to demonstrate squeezing over a broad frequency bandwidth of 1.75 gigahertz, nearly two orders of magnitude higher than other architectures.
Trapped ions have previously only been entangled in one and the same laboratory. Now, teams have entangled two ions over a distance of 230 meters. The nodes of this network were housed in two labs at the Campus Technik to the west of Innsbruck, Austria. The experiment shows that trapped ions are a promising platform for future quantum networks that span cities and eventually continents.
When two microscopic systems are entangled, their properties are linked to each other irrespective of the physical distance between the two. Manipulating this uniquely quantum phenomenon is what allows for quantum cryptography, communication, and computation. While parallels have been drawn between quantum entanglement and the classical physics of heat, new research demonstrates the limits of this comparison. Entanglement is even richer than we have given it credit for.
Optical fibres are the backbone of our modern information networks. From long-range communication over the internet to high-speed information transfer within data centres and stock exchanges, optical fibre remains critical in our globalised world.
Researchers have developed an integrated electro-optic modulator that can efficiently change the frequency and bandwidth of single photons. The device could be used for more advanced quantum computing and quantum networks.
The ARQ19 patent’s claim of achieving long-range quantum key distribution without trusted nodes is unfounded because it relies on an unexplained confidential classical channel between end users that cannot be quantum-based due to distance limitations, making the system’s security ultimately dependent on this non-quantum channel rather than achieving true quantum security.