KT has been granted a patent for a quantum key distribution system that includes a transmitter and receiver. The system splits an optical signal into two paths of different lengths and utilizes a quantum channel for secure key distribution, incorporating polarization-dependent elements and a Faraday mirror. GlobalData’s report on KT gives a 360-degree view of the company including its patenting strategy. Buy the report here.
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According to GlobalData’s company profile on KT, Adaptive video coding was a key innovation area identified from patents. KT's grant share as of July 2024 was 61%. Grant share is based on the ratio of number of grants to total number of patents.
Quantum key distribution system for secure communication
The patent US12074970B2 describes a quantum key distribution (QKD) system designed to securely distribute a quantum cryptographic key between a transmitter and a receiver. The system features a transmitter that splits an optical signal into two paths: a shorter first path (P1) and a longer second path (P2). The transmitter sequentially transmits these optical signals, while the receiver is configured to receive and return them through a quantum channel. A critical aspect of the design is the requirement that the difference in lengths between the two paths (dL) must be at least twice the distance between a polarization-dependent element and a Faraday mirror in the receiver, ensuring effective signal processing and polarization management.
Further enhancements to the QKD system include the use of a light source and a beam splitter in the transmitter, which facilitate the generation and splitting of the optical signal. The system may also incorporate a delay line in the second path to extend the propagation time of the second optical signal. The receiver is equipped with multiple polarization-dependent elements, including phase and intensity modulators, which allow for precise control over the optical signals based on their polarization states. This configuration aims to optimize the transmission and reception of the quantum key, thereby enhancing the security and efficiency of the quantum key distribution process.
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GlobalData Patent Analytics tracks bibliographic data, legal events data, point in time patent ownerships, and backward and forward citations from global patenting offices. Textual analysis and official patent classifications are used to group patents into key thematic areas and link them to specific companies across the world’s largest industries.
