The researchers demonstrated the first complete implementation of entanglement-based quantum key distribution using frequency-bin encoding on a silicon photonic chip, overcoming phase noise challenges to achieve stable transmission over 26 kilometers of fiber with a secure key rate of at least 4.5 bits per second.
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.
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.
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 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.
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.
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.
A theoretical study advancing the composable security analysis of Gaussian quantum networks in finite-size regimes, introducing a novel parameter estimation methodology based on end-user data sharing, while demonstrating potential breakthroughs in surpassing the PLOB bound through quantum amplifier-assisted chains, though practical implementation remains challenging.
Quantum dot-based single-photon sources offer superior security for quantum cryptography through their unique combination of on-demand emission, high brightness, low multiphoton contribution, and tunable coherence in photon-number states, outperforming traditional Poisson-distributed sources across multiple cryptographic primitives.
Researchers have addressed the question of efficient implementation of quantum protocols, with small communication and entanglement, and short depth circuit for encoding or decoding.
QuTech, Eurofiber and Juniper Networks have launched a Quantum testbed connecting several datacenter locations in The Netherlands.
Equinix is planning to use Quantum Key Distribution (QKD) technology from SK Telecom to secure dedicated lines between its data centers. The two companies have an agreement to develop QKD, a cryptographic communications technique which […]
For many applications making use of quantum effects, the light has to be in a certain state — namely a single photon state. But what is the best way of generating such single photon states? Researchers have now proposed an entirely new way.
A novel framework based on semidefinite programming provides universal security bounds for device-independent quantum key distribution by directly calculating von Neumann entropy using complete measurement statistics, enabling analysis of complex protocols beyond traditional CHSH inequality violations and extending to other device-independent cryptographic tasks.
Rigorous security proofs for continuous variable quantum key distribution systems with intensity fluctuating sources are presented, dividing implementations into multiple cases based on monitoring capabilities and adapting techniques like Gaussian extremality and tagging to enable secure key generation over 50+ kilometers without hardware modifications.
This research explores quantum relay technology in non-Markovian conditions, extending beyond traditional independent error models.
ID Quantique (IDQ), the world leader in quantum-safe security solutions, today launched the Cerberis XG at the Inside Quantum Technology conference (IQT).
A team of researchers at QuTech – a collaboration between Delft University of Technology and TNO – is the first to have connected two quantum processors through an intermediate node and to have established shared entanglement between multiple stand-alone quantum processors.
Researchers from QuTech in the Netherlands reports realization of the first multi-node quantum network, connecting three quantum processors.
QuTech, KPN, SURF and OPNT are launching a collaboration designed to make significant progress in building a first ever quantum network connecting the Randstad, i.e. one of the main metropolitan regions in The Netherlands. The project will focus on connecting different quantum processors, a significant distance apart, over a Dutch network. The aim is to build the very first fully functional quantum network using high-speed fibre connections.
SIG, ID Quantique and ADVA announced today the implementation of the first quantum encrypted datacenter interconnection with QKD.