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Qunnect aims to Quantum Repeater Commercialization

Qunnect was awarded two SBIR awards from the US Department of Energy totaling $1.85M for the development and commercialization of the company’s Quantum Repeater product suite. When complete, this collection of devices supports the next generation […]

Schematic setup for our one cycle implementation of Salih et al.’s 2013 counterfactual communication protocol.

The laws of physics do not prohibit counterfactual communication

It has been conjectured that counterfactual communication is impossible, even for post-selected quantum particles. A team of researchers has strongly challenged this by proposing precisely such a counterfactual scheme where—unambiguously—none of Alice’s photons that correctly […]

Fusion success creates a 7-GHZ state and failure performs X-basis measurements on the fused qubits, resulting in two 2-GHZ states (Bell pairs) and a 3-GHZ state. Even though the states are represented using graphs, they are not cluster states.

Entanglement generation in a quantum network at distance-independent rate

Researchers have developed a protocol for entanglement generation in the Quantum Internet that allows a repeater node to use n-qubit Greenberger-Horne-Zeilinger (GHZ) projective measurements that can fuse n successfully entangled links, i.e., two-qubit entangled Bell pairs shared across n network edges, […]

2 × N plug-and-play (PnP) twin-field quantum key distribution (TF-QKD) network scheme.

2×N twin-field quantum key distribution network configuration

Developing Quantum Key Distribution (QKD) has been recently directed toward distance extension and network expansion for real-world secure communications. Considering a recent report on a quantum communication network over 4,600 km, it seems that QKD networks […]

Illustration of implementation in a quantum token scheme.

Practical quantum tokens without quantum memories

Unforgeable quantum money tokens were the first invention of quantum information science, but remain technologically challenging as they require quantum memories and/or long-distance quantum communication. More recently, virtual “S-money” tokens were introduced. These are generated […]

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PQShield raises $20 million Series A

PQShield, a cybersecurity company specializing in post-quantum cryptography, has today announced $20 million in series A funding. The operation has been led by Addition, the venture firm founded by Lee Fixel, with participation from existing […]

QKD - Quantum Key Distribution

China sets world record of long-haul quantum distribution

Chinese scientists have implemented twin-field quantum key distribution (QKD) through an 833-km optical fiber, setting a new world record in the field. The system has tolerated a channel loss beyond 140 dB. Furthermore, the optimized four-phase […]

Levels of device assumptions.

Computing secure key rates for quantum cryptography with untrusted devices

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.

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Telefónica Tech collaborates with Quside and Qrypt

Telefónica Tech has collaborated with Barcelona-based startup Quside, and New York-based Qrypt to successfully complete the integration of a new quantum technology into its cloud service hosted in its Virtual Data Centers (VDC). Telefónica Tech […]