QKD Systems

Multiplexed QKD System MU

Optimum QKD performance, easy integration

Quantum computing is threatening to render public key encryption techniques insecure, with data in transit particularly vulnerable to attack. QKD (Quantum Key Distribution) provides the answer, enabling quantum-safe cryptography across fibre networks.

QKD normally requires separate dark fibres dedicated solely to carrying quantum signals. But with Toshiba's Multiplexed QKD System MU, you can easily integrate QKD on to existing data carrying fibres - and without any compromise to performance.

Deployed over an existing single fibre or a fibre pair, the MU QKD System uses O-band WDM technology to overlay quantum signals with network data, eradicating the need for an additional dark fibre. This true co-existence between QKD and data dramatically reduces the CAPEX and OPEX costs involved in delivering quantum-safe encryption.

With simple setup, auto-alignment, real-time optimisation and high key rates, Multiplexed QKD System MU ensures operators are set up to deliver QKD across their networks.

Ultimate quantum security, all on the fibre you already have.


Developed to deliver QKD in complex metro-scale environments, with the simplest integration
Provably secure protection provided by the most advanced QKD protocol
Proprietary active stabilisation technology that adapts to the network environment

Features & Benefits


Key Exchange Protocol
Toshiba T12 protocol (efficient BB84 protocol with decoy states and phase encoding)
Quantum Wavelength
1310 nm (O-band)
Fibre requirement
Single fibre pair or single bi-directional fibre
Multiplexing Compatibility
Option to multiplex C-band high-bandwidth customer data (with up to +20 dBm total launch power)
Secure Key Rate
300 kb/s at 10 dB channel loss
Maximum loss (using ideal SM fibre)
30 dB specified loss budget
Maximum Range (using ideal SM fibre)
80 km+
Detection Technology
Proprietary self-differencing semiconductor detectors
Security Parameter
Key failure probability < 1 x 10-10, corresponding to less than once in 30,000 years
Monitoring functions
SNMP v2 & v3, GUI, CLI
Key Management
Key Management System (key generation, key storage, proactive/on-demand key delivery). System supporting GS QKD 014 industry standard key delivery API
CE, UKCA: EN 55032:2015+A11, EN 55035:2017+A11, EN 61000-3-2:2014, EN 61000-3-3:2013, EN 63000:2018. 62638-1:2014, IEC 62638-1:2020, BS EN 60825-1:2014, IEC 60825-2:2010,FCC: 47 CFR, Part 15, FDA: 21 CFR, Part J
Standard 19’’ rack mount (3U height)

Latest Toshiba MU resources


Toshiba QKD Systems LD & MU Datasheet (PDF, 1 MB)

Latest product details and specifications for Multiplexing MU and Long Distance LD QKD systems. Discover all the key details on our Long Distance and Multiplexing QKD systems - download now.

Quantum Key Distribution and Blockchain (PDF, 1 MB)

The power of quantum computing technology can challenge the security of any system reliant on certain mathematical algorithms, meaning it could undermine the security that blockchain promises. Quantum Key Distribution is the answer. This paper will explore the evolution of QKD, its future, and a real-world application research study with Toshiba, JPMorgan Chase and Ciena.

[EXTERNAL] Experimental quantum key distribution beyond the repeaterless secret key capacity (Nature)


[EXTERNAL] Overcoming the rate–distance limit of quantum key distribution without quantum repeaters (Nature)

A chart illustrating high reliability

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