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Computing that uses controlled quantum physical states to represent and process information, offering potential advantages for certain calculations.
Save conceptQuantum computing uses quantum physical systems to represent and process information. Its basic information unit is a qubit, short for quantum bit. Unlike an ordinary bit constrained to a recorded zero or one, a qubit can be prepared in a superposition of those states. This is a physical property used by an algorithm, rather than a promise that a machine can answer any question instantly.
Operations change the states of qubits, and correlations between them can be used during a calculation. The result is obtained through measurement, which produces limited information. Algorithms must arrange those operations so the measured result is useful. Interactions with the environment can introduce errors, making control, reliability and correction central engineering challenges.
Consider a hypothetical research team estimating the energy of a small molecule. It could run a quantum calculation repeatedly, compare the estimates with a conventional calculation and examine the errors. Only after verifying the result would it investigate a harder molecule. This example illustrates a possible research process; it is not a claim that a particular company has achieved a commercial advantage.
A quantum computer is not simply a faster replacement for every conventional computer. Potential advantages are tied to particular problems and algorithms. Nor does a small quantum processor automatically threaten : that would require enough reliable capability to execute the relevant attack. Keep a theoretical possibility, an experimental demonstration and a useful large-scale application distinct.
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