Quantum Key Distribution (QKD)
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C-DOT’s Quantum Key Distribution (QKD) system provides unconditional security for communication infrastructure against the emerging threat from quantum computers and quantum algorithms. QKD enables communicating parties to generate shared, secret random keys known only to them, that can be used to encrypt and decrypt communication streams, ensuring fool-proof security during data transmission. The security of the QKD system is guaranteed by the fundamental principles of quantum mechanics, and any attempt of eavesdropping during key generation and distribution causes detectable anomalies. C-DOT’s QKD solution consists of two nodes, conventionally called Alice (QKD transmitter) and Bob (QKD receiver), connected through a unidirectional quantum channel (for transmitting qubits from Alice to Bob) and a bidirectional classical channel (for synchronization and post-processing). Both channels utilize standard single-mode fibre, commonly used in telecommunication networks. The existing communication networks can be upgraded with quantum security using the C-DOT QKD system. QKD can be deployed in strategic sectors where data security and confidentiality are paramount. These sectors include defence, banking, financial services, and insurance (BFSI), healthcare, telecommunications, government, and data centre networks.
• Any intervention or tampering in the quantum channel gets detected and leads to the destruction of keys at both Alice and Bob nodes • Uses standard single-mode optical fibre • Supports Differential Phase Shift (DPS) and Coherent One Way (COW) protocols • Hardware-based key processing for high secure key rate • Selectable True Random Number Generator (TRNG) and Quantum Random Number Generator (QRNG) in both Alice & Bob nodes • Supports multiple QKD network topologies (linear, ring, etc.) through trusted relays • Key management, QKD network control and management compliant with ITU-T Y.3800-Y.3804 • QKD Network Manager to support FCAPS (Fault, Configuration, Accounting, Performance, and Security) management • Provide variable key length on request • RESTful API for key supply (compliant with ETSI GS QKD 014) through Ethernet/USB interfaces • Support Local Management Interface (LMI) • Performance monitoring and alarm generation for errors • Graphical User Interface (GUI) to control and configure the system • Successfully tested with C-DOT Router and 100G/200G Muxponder, ensuring seamless integration with existing network infrastructure • Technology Approval received from Telecom Engineering Centre (TEC) for compliance with TEC GR 91000:2022
• Secure key rate (at 23 dB loss): > 2 Kbps for DPS protocol*, > 1 Kbps for COW protocol • QBER: < 5% • Key transfer interface: USB/Ethernet • Quantum channel wavelength: C-Band • WDM compatibility: Customizable • Operating temperature: 10 to 25°C • Detector type: Single-Photon Avalanche Diode (SPAD) • Power supply: 230V AC@50Hz • Maximum power consumption: 250W (Alice), 250W (Bob) • Mechanical dimensions: 2U height, 19” rack-mountable *DPS protocol tested with up to ⁓30 dB loss with a reduced key rate
The C-DOT QKD system has been awarded the 14th Aegis Graham Bell Awards in Innovation in Telecom category