QKD Systems

FleXible QKD System LX


Wavelength customisable QKD deployment

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.

The specific fibre requirements for QKD deployment can be challenging for many organisations to navigate, particularly in cases where it's necessary to integrate with existing fibre architectures and multiplexing schemes.

The LX system overcomes this challenge by allowing users to deploy the quantum information along a single dedicated fibre, and to multiplex the QKD service channels into existing fibre architectures alongside classical data services. It is also possible to pre-select the QKD service channel wavelengths.

This customisable set-up offers increased flexibility and cost optimisation.

The Toshiba LX system makes quantum security work around you.


Flexible deployment: easily integrates into existing fibre networks
Cost-optimised QKD option
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)
Customisable Wavelengths
C-band (1530-1570 nm) wavelengths customisable during manufacture for both quantum and service channels. Wavelengths should be in accordance with the ITU DWDM grid.
Fibre requirement
1 x Dedicated dark fibre required for the quantum channel for best performance
3 x Service channels can be multiplexed onto existing fibre networks
Secure Key Rate
150 kb/s at 10 dB channel loss
Optical Loss Budget
24 dB specified loss budget
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 ETSI 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. IEC 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 LX resources


Toshiba QKD Systems LX Datasheet (PDF, 3.4 MB)

Latest product details and specifications for FleXible QKD system LX. Discover all the key details - 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)


[EXTERNAL] A Quantum Light-Emitting Diode for the Standard Telecom Window Around 1,550 nm (Nature)

A chart illustrating high reliability

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