By Mehmet Enes Beşer
Southeast Asian maritime security is usually discussed in the blunt language of hardware: ships, missiles, bases, patrol days, tonnage. It’s the language of what you can float and what you can threaten. But the next big shift in the region’s waters may arrive without a single new hull. It may arrive as a change in what can be seen, what can be trusted, and what can be spoofed.
That shift has a name—quantum—and it’s going to mess with the invisible scaffolding Southeast Asian navies already depend on. Not tomorrow in a Hollywood “quantum breakthrough” moment, but gradually, unevenly, and in ways that are easy to ignore until they aren’t.
And Southeast Asia has a particular problem here: it lives in an environment where small advantages in sensing and information can produce big political consequences fast. In the South China Sea, in choke points, around undersea cables, a misread signal isn’t just a technical issue. It’s an incident. It’s a headline. It’s a crisis management test.
The Region Is Already Operating in a Hostile Electronic Environment
Before we even get to quantum, it’s worth saying the quiet part out loud: many Southeast Asian maritime systems are already brittle. Navigation depends heavily on satellite signals that can be jammed or spoofed. Communications often run on networks that can be intercepted or degraded. Critical infrastructure—ports, offshore energy, subsea cables—relies on data flows that are physically hard to patrol and digitally easy to probe.
When something fails, it often looks like a “glitch” first. That’s the dangerous phase, because decision-makers hesitate: is it a technical malfunction, an accident, or someone pushing buttons?
Quantum doesn’t create this problem. It amplifies it.
Three Ways Quantum Changes the Game
The hype is real, and the timelines are uncertain. But you don’t need science fiction to see where the pressure points are.
First: encryption.
The long-term risk quantum computing poses to widely used cryptography isn’t just a banking concern. Maritime agencies, telecom providers, port authorities, energy operators—everyone is sitting on the same digital foundation. And even before any “break” happens, there’s a quieter threat: harvest now, decrypt later. If an actor can store encrypted traffic today and unlock it later, the value of collecting data rises now. That changes the logic of espionage, and it punishes countries that treat cybersecurity like a checklist.
Second: navigation asymmetry.
Southeast Asia already deals with GPS interference. If quantum-enhanced inertial navigation and sensing mature, some actors may be able to move accurately without relying on satellite signals, while others remain dependent on systems that can be disrupted. That’s not a small advantage. It means some navies can operate confidently when the electromagnetic environment gets ugly—and others can be pushed into hesitation, error, or caution.
Third: undersea detection.
This is the most politically combustible promise: improved sensing that makes the underwater domain less ambiguous. Even incremental gains in detecting submarines, mines, or anomalies near undersea infrastructure would shift the balance in a domain that has traditionally rewarded stealth. But here’s the catch: detection isn’t clean. It’s probabilistic. False positives happen. And in a tense maritime theater, a false positive isn’t an engineering annoyance—it’s a diplomatic incident waiting to happen.
If the ocean becomes more “transparent” for some actors, the first-order effect is deterrence recalculation. The second-order effect is miscalculation risk.
Southeast Asia Can’t Buy Its Way Into the Quantum Race
This is the part ASEAN states need to resist. When new tech arrives, smaller navies often feel pressure to respond with prestige purchases. The result is predictable: vendor dependency, shiny platforms, and budgets burned on capabilities that don’t actually solve the underlying vulnerability.
Quantum pressure should push Southeast Asia to modernize the invisible parts of maritime power—boring, technical, and absolutely decisive.
What “Preparation” Actually Looks Like
1) Treat cryptography as critical infrastructure, not IT.
The shift to post-quantum cryptography is not glamorous. It’s mostly software, standards, and procurement discipline. But starting early matters. Inventory systems. Identify the hardest-to-upgrade equipment. Demand “crypto agility” in new procurement—the ability to change algorithms without replacing whole systems. If ASEAN waits until a crisis moment, it will be forced into rushed upgrades and expensive lock-in.
2) Train for a world where signals lie.
Many forces still train as if communications will work, and navigation will be clean. That assumption is already false, even without quantum. The region needs better spoofing awareness, redundancy in comms, routines for operating under degradation, and doctrine that treats spectrum disruption as normal. This is less about having “quantum tech” and more about not collapsing when the electromagnetic environment is contested.
3) Protect undersea infrastructure like it actually matters.
Subsea cables are the nervous system of modern economies, yet protection remains patchy and reactive. You don’t need exotic sensing to improve this. You need joint incident protocols, shared awareness near landing points, and legal frameworks that let states investigate interference without turning every event into a sovereignty panic. Quantum sensing may eventually enhance monitoring, but Southeast Asia’s near-term weakness is governance and coordination, not sensors.
4) Use ASEAN cooperation for practical resilience, not slogans.
Here’s the opportunity: quantum at the frontier is expensive, but resilience is scalable. ASEAN can pool training, establish common cyber standards for maritime agencies, run “red-team” disruption exercises near choke points, and build shared baselines so the weakest link is less easy to exploit. This isn’t about creating an ASEAN navy. It’s about removing easy vulnerabilities that invite coercion.
External Partners Can Help—If They Stop Counting Ships
Australia, Japan, South Korea, the EU, and the U.S. love “capacity-building” language. Here’s a capacity-building agenda that actually matches the threat: support post-quantum migration planning, fund secure maritime communications projects, help create testing facilities, and embed training that assumes contested spectrum conditions.
If partners want Southeast Asia to be safer, they should stop measuring seriousness by how many ships are bought and start measuring it by how many systems still work when the lights flicker.
Politics Will Be Entangled, So Plan for That Too
Quantum disruption won’t arrive in a neutral environment. It will collide with South China Sea tensions, great-power competition, and domestic anxieties about surveillance and sovereignty. Some states will fear that adopting new standards increases dependency on foreign vendors. Others will worry that admitting vulnerabilities invites exploitation. Those concerns are real.
But drifting into a quantum-enabled environment with outdated systems and fragmented coordination is worse.
The region’s goal is not to become “quantum powers.” It’s to avoid becoming quantum victims.
Quantum technologies tempt Southeast Asia’s familiar coping mechanism: treat the threat as distant, abstract, inevitable. But the preparation required isn’t futuristic. It’s the slow work of upgrading systems, training people, building redundancy, and cooperating with neighbors who share the same sea and the same vulnerabilities.
If the ocean becomes more transparent, the first thing it will expose won’t be submarines. It will expose which states invested in resilience—and which mistook maritime security for a parade of platforms.
ASEAN doesn’t need to win the quantum race to protect itself. It needs to run a different race: toward collective readiness, shared standards, and the ability to keep operating when disruption becomes normal. That’s a competition Southeast Asia can actually win—if it treats the invisible side of maritime power as seriously as the visible one.