What Is Quantum Technology?

"Quantum computing" gets most of the headlines, but it's one branch of a broader field usually grouped into three:

Quantum computing: using qubits to compute, as described above. Quantum communication and cryptography: using quantum physics to detect eavesdropping on a transmitted signal (quantum key distribution) or to build encryption believed to resist even a future quantum computer (post-quantum cryptography). Quantum sensing and metrology: using quantum effects to measure things (magnetic fields, gravity, time) with a precision classical instruments can't reach, already used in some atomic clocks and specialized lab instruments today.

All three share the same foundation (superposition, entanglement, and how quantum systems behave when measured), but they're separate engineering disciplines with different hardware, different companies, and very different timelines to real-world use. Quantum sensing is, in some specific forms, already deployed; quantum communication is in early pilots; general-purpose quantum computing is still mostly a research and early-enterprise field. Conflating the three is one of the most common sources of hype in quantum reporting. A headline about a sensing breakthrough is not evidence that quantum computers are close.