Researchers have successfully demonstrated device-independent quantum key distribution over 62 miles of optical fiber.
Researchers have demonstrated device-independent quantum key distribution over 62 miles of optical fiber . The study, led by Bo-Wei Lu and an international team, represents an increase in the distance over which this specific encryption method can be maintained.
This distance extends previous records by approximately two orders of magnitude, moving the technology toward metropolitan-scale implementation.Hardware-independent securityCurrent encryption methods are potentially vulnerable to the computational capabilities of future quantum computers. Traditional Quantum Key Distribution addresses this, but standard implementations require the user to verify that the hardware functions exactly as specified by the manufacturer.DI-QKD addresses this by utilizing Bell inequality violations. This method allows for the verification of security based on the statistical correlations of entangled particles, treating the physical devices as “black boxes.” Because the security is derived from the laws of physics rather than the internal configuration of the hardware, the system remains secure even if the devices are provided by an unverified third party.“However, DI-QKD is extremely demanding and requires the creation of high-quality entanglement and efficient detection over long distances,” said the researchers in a press release.“To date, DI-QKD has only been demonstrated over short distances and in laboratory-based proof-of-principle experiments.”Technical challenges at 62 milesMaintaining high-quality entanglement over long distances is difficult due to signal loss and environmental interference within optical fibers. To achieve the 62 mile distance, Lu’s team implemented several technical solutions. “By combining advanced techniques such as single-photon interference and quantum frequency conversion to low-loss telecom wavelengths, the researchers successfully distributed high-fidelity entanglement over long distances,” added the press release.The team also employed noise-suppressed photon emission to prevent external interference from degrading the quantum information. “The researchers achieved provably secure quantum key generation over 11 km with finite data, and showed that positive key rates are possible even at 100 km,” concluded the researchers.The results indicate that DI-QKD is technically viable for linking different locations within a metropolitan area.Foundational research in quantum fiber transmissionThe recent 62-mile demonstration aligns with earlier research conducted by independent institutes in other countries, which have been reported by Interesting Engineering. These studies confirmed that quantum bits could be transmitted over long-distance fiber optic infrastructure.A significant portion of this foundational work was conducted at the Delft University of Technology in the Netherlands. Researchers there utilized nitrogen-vacancy centers in diamond crystals to store and transmit information. In this setup, qubits are encoded in the electrons of nitrogen atoms and the nuclear states of carbon atoms within the diamond lattice.In one experiment, an optical fiber link was established between the university and a laboratory in the Hague, covering a distance of 15.5 miles. This link connected nitrogen atoms embedded in diamond crystals at both locations. The successful transmission demonstrated that quantum entanglement could be established between separate facilities using existing fiber networks, providing the basis for the more recent 62-mile DI-QKD achievements.The study has been published in the Science journal.
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