NEC had 15 patents in quantum computing during Q1 2024. NEC Corp’s patents in Q1 2024 focus on improving signal quality and security in optical communication systems. The inventions include a transmitter and communication device that enhance signal stability and SN ratio in optical transmission lines, as well as a hybrid Quantum Key Distribution (QKD) protocol for secure transmission in long-distance and undersea optical networks. Additionally, the patents also describe methods to prevent eavesdropping in quantum key distribution by utilizing decoding units, photon detectors, and signal processing units. GlobalData’s report on NEC gives a 360-degree view of the company including its patenting strategy. Buy the report here.

NEC grant share with quantum computing as a theme is 33% in Q1 2024. Grant share is based on the ratio of number of grants to total number of patents.

Recent Patents

Application: Transmission control techniques in quantum cryptographic communication system (Patent ID: US20240106543A1)

The patent filed by NEC Corp describes a transmitter for a quantum cryptographic communication system that can improve the signal-to-noise ratio and stability of signal output in an optical transmission line with changing propagation characteristics. The transmitter includes an optical transmission section that generates weak signal light and reference light from a transmission light pulse, and a controller that modulates the pulse intensity and pulse width of the transmission light pulse based on the transmission line state detected using probe light. The controller adjusts the pulse intensity and width without changing the energy of the transmission light pulse, enhancing the performance of the system.

Furthermore, the transmitter also includes a probe light transmission section, a probe light detector, and a calculator to detect and calculate the transmission line state. The method involves transmitting probe light through the optical transmission line, detecting the received probe light, and calculating the transmission line state based on the detection output. Additionally, the quantum cryptographic communication system described in the patent involves both a transmitter and a receiver connected through an optical transmission line with changing propagation characteristics. The system includes a controller in the transmitter that modulates the pulse intensity and width of the transmission light pulse based on the transmission line state, ensuring efficient and stable communication between the transmitter and receiver. The receiver may include components such as a mirror, calculator, and optical amplifier to further enhance the performance of the system based on the detected transmission line state.

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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.