Why Logical Qubits Matter More Than Physical Qubit Counts

Physical qubit counts have become one of the most visible metrics in quantum computing because they are simple, measurable and easy to communicate. For investors, however, they can be a weak guide to industrial maturity. A system with many physical qubits may still be unable to perform useful computation if error rates, fidelity, coherence, readout, control electronics and system integration remain insufficient. The central question is therefore not how many qubits a company can announce, but how much reliable computation it can deliver, at what cost, and with what path toward scalable utility.