Articles tagged with Quantum Cryptography
Physicists at NIST have demonstrated single photon detectors with an 88% efficiency, a significant improvement over previous designs. The detectors use a tungsten film chilled to near-absolute zero and are expected to enable reliable quantum communications systems.
The NIST quantum key distribution system generates a verifiably secret key at a rate of 1 million bits per second, about 100 times faster than previously reported systems. The system uses time-stamping and high-speed observations to identify photons from the sender among multiple photons from other sources.
The NIST-developed device detects single photons with negligible dark counts using a tungsten film coupled to fiber optic communication line. It achieves a detection rate of 20,000 photons per second with an efficiency of 20%, aiming for over 80% improvement.
Researchers have developed a high-speed encryption protocol using noisy light to secure information, promising unconditionally secure, fast, easy-to-manage, and cost-efficient security. The Northwestern method transmits encrypted data at 250 megabits per second, outpacing conventional cryptography and existing quantum methods.
Scientists at IBM's Almaden Research Center performed the first demonstration of Shor's historic factoring algorithm, solving a simple version of the mathematical problem at the heart of many data-security systems. The team controlled a billion molecules in a test tube to become a seven-qubit quantum computer.
Researchers successfully sent encrypted messages using quantum entanglement, a phenomenon that allows particles to be linked across distances. The demonstration marks a significant step towards creating secret codes that are virtually unbreakable and could eventually replace current data encryption methods.