The Signal
IonQ Puts Hybrid QKD-PQC Network Into Operation
IonQ says its hybrid quantum key distribution and post-quantum cryptography network is operating across four company sites in Geneva and Seoul. The deployment uses QKD on local Geneva fiber links and PQC to secure VPN endpoints connecting S
Quantum.world Team · Written with AI · fact-checked ·
This is not a sandbox deployment or a field trial; this is IonQ using its long-tested, proven, and validated quantum-safe security techniques on its own mission-critical, international infrastructure to add new layers of security onto its enterprise defenses.
IonQ Staff, IonQ
IonQ says the hybrid quantum-security network described in that statement is now operating across four of its sites in Geneva and Seoul. The company’s October 26 announcement describes an internal deployment, not a customer rollout: quantum key distribution (QKD) protects local fiber links in Geneva, while post-quantum cryptography (PQC) secures software-defined VPN endpoints connecting Geneva with its South Korean headquarters.
The arrangement splits the work between two technologies. QKD uses quantum states to establish shared secret keys over a physical link; PQC uses conventional computing and mathematical algorithms designed to resist attacks from quantum computers. IonQ presents the combination as a way to apply different protections to local, high-priority links and communications spanning much greater distances.
Geneva gets QKD; the Seoul connection gets PQC
In its announcement, IonQ says QKD operates on local fiber linking its Geneva sites and provides information-theoretic security for selected internal communications. PQC is applied at VPN endpoints on the route between Geneva and the company’s headquarters in Seoul. The post says the deployment protects operational data, proprietary research, intellectual property and communications infrastructure.
That division reflects a practical constraint: QKD depends on a quantum channel, typically optical fiber, and its reach is limited by signal loss. The ITU’s technical report on hybrid QKD-PQC communications describes fiber QKD as limited to a few hundred kilometers without trusted intermediate nodes. PQC can protect communications over existing network connections, making it suited to the long-distance part of IonQ’s setup.
Four sites, but limited deployment detail
IonQ calls the network operational and distinguishes it from a sandbox or field trial. The public post, however, does not identify the equipment used in this deployment, the specific PQC algorithms, the QKD key rate, link lengths, uptime, cost or an independent security assessment. Those omissions make it difficult to compare the system’s performance with other enterprise deployments or assess how it would transfer to a customer environment.
The company describes the Geneva-to-Seoul network as the first step in a broader program to develop a repeatable security approach. It also says its QKD links cover Geneva locations while PQC protects the VPN endpoints across the international connection; it does not describe an end-to-end QKD link between the two cities. The architecture, as disclosed, is a mix of local quantum key distribution and long-distance software cryptography.
IonQ frames the deployment as an enterprise model
IonQ says it wants organizations to use the deployment as a blueprint for planning their own quantum-safe transitions, including protection against “harvest now, decrypt later” attacks, in which encrypted data is collected for possible decryption in the future. The company argues that migration can take years because organizations must inventory cryptographic assets, select vendors, and test and validate replacements.
IonQ also points to previous QKD projects in Slovakia, Romania and Singapore, but those are separate efforts from this internal network. For the Geneva-Seoul deployment, the concrete design disclosed so far is narrower: QKD protects local Geneva fiber links, and PQC secures VPN endpoints linking the company’s European sites to South Korea.