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.
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.
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.
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.
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.
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 have developed a QKD receiver chip featuring the full photonic circuitry needed for different time-based protocols, including single-photon detectors.
Sheffield University spin-out AegiQ has raised £1.4m (€1.5m) to build a semiconductor platform for quantum communications.
SIG, ID Quantique and ADVA announced today the implementation of the first quantum encrypted datacenter interconnection with QKD.
ITMO University researchers have developed a Quantum Key Distribution (QKD) system with coherent detection based on subcarrier wave quantum key distribution protocol.
An international team has developed a new method for generating quantum-entangled photons in a spectral range of light that was previously inaccessible.
Quantum Xchange announced the availability of Post-Quantum Cryptography (PQC) algorithms to its Phio Trusted Xchange key distribution system.
Researchers have developed a quantum communication chip that is 1,000 times smaller than current quantum setups, but offers the same superior security quantum technology is known for.
In September 2019, the European Commission (EC) announced the launch of OPENQKD, a €15 million worth project aimed to provide test quantum communication infrastructures in several European countries. Four Swiss Geneva-located firms, The University of […]
ABN AMRO and Qutech are working to develop a technology based on Quantum Key Distribution (QKD) to improve banking security.