{"id":1813,"date":"2025-03-26T09:48:36","date_gmt":"2025-03-26T09:48:36","guid":{"rendered":"https:\/\/www.toshiba.eu\/quantum\/?post_type=news&p=1813"},"modified":"2025-03-26T09:48:36","modified_gmt":"2025-03-26T09:48:36","slug":"worlds-first-successful-demonstration-of-quantum-key-distribution-technology-for-multiplexing-over-30-tbps-of-high-capacity-data-and-secret-keys","status":"publish","type":"news","link":"https:\/\/www.toshiba.eu\/quantum\/news\/worlds-first-successful-demonstration-of-quantum-key-distribution-technology-for-multiplexing-over-30-tbps-of-high-capacity-data-and-secret-keys\/","title":{"rendered":"World’s First Successful Demonstration of Quantum Key Distribution Technology for Multiplexing Over 30 Tbps of High-Capacity Data and Secret Keys"},"content":{"rendered":"\n

Achieving three times the capacity compared to conventional methods by utilizing the O-band, with the aim of practical application in inter-data center communications\u00a0<\/em><\/strong><\/h2>\n\n\n\n

KDDI Research, Inc. (\u201cKDDI Research\u201d), and Toshiba Digital Solutions Corporation (\u201cToshiba Digital Solutions\u201d) have developed a multiplexing technology for quantum key distribution (QKD)1<\/sup>\u00a0that is theoretically impossible to eavesdrop. This technology assigns secret keys to the C-band2<\/sup>\u00a0and high-volume data signals to the O-band, enabling multiplexed transmission over a single optical fiber3<\/sup>. Furthermore, utilizing this technology, we have successfully transmitted secret keys and high-capacity data signals at 33.4 Tbps over 80 km for the first time.
<\/p>\n\n\n\n

To date, commercial solutions utilizing QKD have focused on technology that enables the transmission of data and secret keys over a single optical fiber. This approach eliminates the need for dedicated fibers for key transmission. However, data transmission interferes with the secret keys by generating noise, making it challenging to transmit high-capacity data. With this new technology, it is possible to achieve higher-capacity communication through a single optical fiber than ever before, significantly reducing the introduction and operational costs of applying QKD technology. This advancement is expected to lead to early practical applications in inter-data center communications and beyond.<\/p>\n\n\n\n

\"A<\/figure>\n\n\n\n

Overview of the technology: Multiplexed transmission of high-capacity data and secret keys in a single optical fiber<\/em><\/p>\n\n\n\n

This achievement will be presented as a technical paper at OFC 2025 (Optical Fiber Communication Conference and Exposition), the world’s largest international conference on optical communication technology, to be held from March 30 to April 3, 2025, in San Francisco4<\/sup>.<\/p>\n\n\n\n

As data center communications continue to grow in capacity, the importance of security measures to protect sensitive information from cyberattacks is becoming increasingly critical. KDDI Research and Toshiba Digital Solutions will continue to advance research and development aimed at realizing high-capacity and secure communication services.<\/p>\n\n\n\n

Background
<\/strong>In the 6G era, the proliferation of AI and IoT is expected to lead to an immense and diverse flow of data across networks, making it essential to further increase the transmission capacity of optical fiber communication to support these networks. Additionally, the transmission of highly sensitive information, such as biometric data used in various authentication methods and genomic information necessary for personalized medicine, is anticipated to rise in the future, creating a demand for high-capacity and secure data communication services. Currently, cryptography based on computational difficulty5<\/sup>\u00a0is employed to protect transmitted data from cyberattacks; however, there are concerns that quantum computers may be able to decrypt this information in the future6<\/sup>.<\/p>\n\n\n\n

As a result, QKD technology, which delivers secure transmission of secret keys, is gaining commercial traction. QKD leverages the principles of quantum mechanics, which state that any attempt to eavesdrop will inevitably alter the quantum state, making it possible to detect eavesdropping. This ensures that the theft of secret keys and the decryption of encrypted data are theoretically impossible, thereby guaranteeing security.<\/p>\n\n\n\n

However, QKD technology that utilizes weak light are susceptible to noise generated by nearby wavelengths of light. Consequently, dedicated optical fibers are required for transmitting secret keys utilizing QKD, which poses challenges in terms of implementation and operational costs. To address this issue, research is being conducted on technologies that multiplex secret keys and data signals over a single optical fiber utilizing different wavelengths. However, achieving both high-capacity data transmission and long-distance communication has proven difficult. Increasing the capacity of data transmission amplifies the noise affecting the secret keys transmitted utilizing the conventional QKD technology, while extending the distance exacerbates the impact of noise on the secret keys.<\/p>\n\n\n\n

Furthermore, KDDI Research has been developing technologies to transmit high-capacity data not only in the widely used C-band and L-band but also in the ultra-wideband O-band7<\/sup>.<\/p>\n\n\n\n

Recent Achievements
<\/strong>In this project, KDDI Research and Toshiba Digital Solutions analyzed and evaluated the impact of data signals transmitted in the O-band on the secret keys transmitted utilizing the QKD method in the C-band. The parameters necessary to optimize the optical power and bandwidth for O-band transmission were identified.\u00a0 As a result, secret keys were successfully multiplexed, and experienced minimal transmission loss in the C-band, with high-capacity data signals transmitted over the ultra-wide O-band. This enabled the transmission of both the secret keys and high-capacity data signals at 33.4 Tbps over 80 km utilizing a single optical fiber.<\/p>\n\n\n\n

This breakthrough increased the transmission capacity to approximately three times compared to conventional technology. Additionally, it enhanced the transmission performance index by approximately 2.4 times, measured as the product of transmission capacity and distance (capacity-distance product), compared to conventional technology8<\/sup>\u00a0that multiplexes both secret keys and data signals in the C-band.<\/p>\n\n\n\n

\"A<\/figure>\n\n\n\n

Comparison of transmission capacity and distance with conventional methods<\/em><\/p>\n\n\n\n

Roles of Each Company<\/strong><\/p>\n\n\n\n

KDDI Research<\/td>Proposal and demonstration of the technology<\/td><\/tr>
Toshiba Digital Solutions<\/td>Development and provision of QKD devices<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

\uff08Note 1\uff09 Quantum Key Distribution (QKD) is a method for securely sharing secret keys utilizing communication based on the principles of quantum mechanics. By reducing the power of light to a weak level, the quantum nature of light becomes apparent, making it impossible to copy the light due to the uncertainty principle and the no-cloning theorem in quantum mechanics. It has been demonstrated that by embedding secret keys in this light and transmitting it, secure secret keys can be shared, eliminating the possibility of eavesdropping.<\/p>\n\n\n\n

\uff08Note 2\uff09 The C-band refers to the wavelength range of light from 1530 to 1565 nm (approximately 4.4 THz bandwidth), which is widely used in long-distance transmission systems due to its low transmission loss in optical fibers. The O-band, on the other hand, covers the wavelength range from 1260 to 1360 nm (approximately 17.5 THz bandwidth). Although it has higher transmission loss than the C-band, it provides approximately four times the bandwidth of the C-band.<\/p>\n\n\n\n

\uff08Note 3\uff09 As of March 26, 2025, according to KDDI Research, Inc.<\/p>\n\n\n\n

\uff08Note 4\uff09 \u201cCoexistence Transmission of 33.4-Tb\/s O-band Coherent Classical Channels and a C-band QKD Channel over 80 km,\u201d Tu3D, April 1, 2025.<\/p>\n\n\n\n

\uff08Note 5\uff09 In current communication networks, public key cryptography is used as a technique for exchanging secret keys to keep communication content confidential. The security of these public key cryptosystems is based on the computational difficulty required for decryption (computational security).<\/p>\n\n\n\n

\uff08Note 6\uff09 There are concerns that quantum computers could quickly decrypt public key cryptography methods such as RSA and elliptic curve cryptography.<\/p>\n\n\n\n

\uff08Note 7\uff09 KDDI Research press release on May 18, 2023: 
Utilization of ultrawide bands to increase the capacity of optical fiber communication: The world\u2019s first successful O-band coherent high-density wavelength division multiplexing transmission experiment ~With this method, equipment configuration is reduced to half that of the conventional configuration. In addition, power consumption for inter-data center communication is expected to be reduced. ~ 
[https:\/\/www.kddi-research.jp\/english\/newsrelease\/2023\/051801.html<\/a>]<\/p>\n\n\n\n

\uff08Note 8\uff09 The maximum transmission capacity for long-distance transmission (over 80 km) utilizing conventional secret keys and C-band data multiplexing is reported to be 11 Tbps in the following paper (as of March 26, 2025, according to KDDI Research, Inc.): T. Dou et al., \u201cCoexistence of 11 Tbps (110\u00d7100 Gbps) classical optical communication and quantum key distribution based on single-mode fiber,\u201d Optics Express, vol. 32, no. 16, July 2024.<\/p>\n","protected":false},"excerpt":{"rendered":"

Achieving three times the capacity compared to conventional methods by utilizing the O-band, with the aim of practical application in inter-data center communications\u00a0 KDDI Research, Inc. 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