Quantum Computing: Could It Really Break the Internet?

Quantum computing has acquired a dramatic reputation: a technology that could unlock private messages, transform medicine, and make today’s computers look hopelessly slow. Some of that excitement has a solid scientific basis. Some of it skips rather too quickly past the engineering. The security concern is real. A sufficiently powerful quantum computer could undermine certain cryptographic methods that help protect online communications. But that is different from saying the internet is about to collapse, or that every password will suddenly become public. The more useful question is what needs to change before those machines arrive.

What Makes Quantum Computing Different?

Ordinary computers represent information using bits: zeros and ones. Quantum computers use qubits, whose behaviour follows the rules of quantum physics.

A qubit can exist in a superposition of its two basis states. Quantum algorithms manipulate these states, using effects such as interference to influence the results obtained when the system is measured.

That does not mean a quantum computer can simply try every possible answer and hand us the right one. The algorithm has to make useful information emerge from the calculation. For many tasks, that offers no clear advantage over conventional computing. IBM’s introduction to the technology explains why quantum machines suit particular problems rather than every workload.

Will a quantum computer replace your laptop?

There is little reason to expect quantum hardware to replace ordinary computers for writing documents, browsing websites or managing spreadsheets.

Its value lies in specialised calculations. A business could eventually use a service that combines conventional and quantum processing without its employees ever interacting with the quantum hardware.

For most people, any benefits would arrive through the services they use.

Could Quantum Computing Break Internet Security?

Parts of today’s security infrastructure rely on mathematical problems that conventional computers cannot feasibly solve at useful security levels.

A sufficiently capable quantum computer running Shor’s algorithm could change that for systems such as RSA and elliptic-curve cryptography. These methods support important functions, including establishing secure connections and verifying digital signatures.

NIST identifies this as a reason to replace vulnerable cryptography before the necessary quantum hardware becomes available. The threat concerns particular mathematical foundations of security, rather than a universal ability to read every protected file.

Why “all encryption is finished” goes too far

Cryptography is a collection of different tools. A weakness affecting one family of algorithms does not mean every other method fails in the same way.

Nor is a quantum computer a magic password-revealing machine.

For a business owner, the sensible conclusion is that security systems will need to evolve. The technical response is already under way.

The Risk Behind “Harvest Now, Decrypt Later”

Some information needs to remain private for decades. Medical histories, confidential research and sensitive government records do not necessarily lose their value after a few months.

This creates a concern known as “harvest now, decrypt later”. An attacker could collect encrypted information today and retain it in the hope that future capabilities will make it readable.

As NIST explains, organisations must consider how long their information needs protection, as well as when a capable quantum computer might arrive.

For example, a confidential research archive could remain commercially sensitive long after the systems that originally protected it have been replaced. Updating those systems later would not retrieve a copy that somebody had already stolen.

How Post-Quantum Cryptography Helps

Post-quantum cryptography uses algorithms designed to resist attacks from both conventional and quantum computers.

Despite the name, it does not require a quantum computer. These protections can run on conventional hardware.

In August 2024, NIST released its first three finalised post-quantum cryptography standards. They cover a mechanism for establishing shared secrets and two approaches to digital signatures. This gave organisations concrete standards to begin implementing.

The difficult part is changing existing systems

Publishing a standard is one step. Introducing it across years of accumulated software, devices and supplier relationships is another.

An organisation may depend on cryptography in places that are easy to overlook: remote access tools, certificates, software updates and connections between systems.

NIST’s post-quantum cryptography programme encourages organisations to begin migrating. The practical challenge is identifying those dependencies and planning a transition that keeps services working.

Where Quantum Computing Could Be Useful

Security gets the dramatic headlines, but researchers are also exploring applications in chemistry, materials and complex decision-making.

These possibilities deserve attention without being presented as guaranteed breakthroughs.

Modelling molecules and materials

Molecules behave according to quantum physics, making them a natural subject for quantum simulation research.

Better simulations could help scientists investigate chemical reactions or materials for batteries and other technologies. However, turning a calculation into a useful product would still require experiments, validation and manufacturing.

The promise is an additional research tool, not a shortcut that removes the laboratory. IBM identifies chemistry and materials research among the potential applications of quantum computing.

Exploring difficult planning problems

Delivery routes, production schedules and resource allocation involve many competing constraints. Researchers are investigating whether quantum approaches can help with some of these problems.

However, a problem having lots of possible combinations does not automatically make quantum computing the best solution. Any proposed approach needs comparison with strong conventional methods, including the time and cost of preparing the data and obtaining a useful answer.

IBM’s discussion of suitable quantum computing problems distinguishes theoretical promise from the practical work needed to establish an advantage.

Claims that quantum computers will eliminate traffic jams or prevent flight delays should therefore be treated as ambitions, rather than delivery dates.

What About Quantum Computing and AI?

Putting two exciting technologies in the same sentence can make almost anything sound inevitable.

The original question still needs answering: what specific task would improve, and why?

A claim about “quantum-powered AI” should explain the problem being solved, the hardware required and the comparison with an existing approach. It should also account for the work needed to move information into and out of the quantum calculation.

A useful demonstration on one task would not, by itself, establish that quantum computing makes every AI model faster, cheaper or more intelligent.

For businesses assessing future products, asking for that evidence is more useful than being impressed by the label.

What Should Businesses Do Now?

For most organisations, the immediate priority is understanding their security dependencies. Buying quantum hardware is unlikely to be the first item on the list.

Use these questions to start a discussion with your IT team or technology providers:

• Which information must stay confidential for years? Identify records whose sensitivity will outlast the systems currently holding them.
• Where do we depend on vulnerable cryptography? Ask about applications, certificates, devices and external services.
• What are our suppliers planning? Request a clear explanation of their post-quantum migration approach.
• How will changes be tested? Consider compatibility, performance and recovery if an upgrade causes problems.

These questions turn a distant-sounding topic into a practical planning exercise. They also help reveal whether somebody owns the work or simply assumes a supplier will handle it.

Preparing for Quantum Computing Without the Hype

The most useful response to quantum computing is to distinguish the established risks from the promises that still need testing.

Some cryptographic methods need replacing. New standards are available. Potential applications in science and industry remain worth investigating, but the outcome depends on the problem, the algorithms and the hardware.

At Snobbots, we explore what emerging technologies mean for businesses beyond the headline. With quantum computing, the sensible first step is to understand what your organisation relies on—and how those protections will be upgraded.