{"id":97658,"date":"2026-05-29T10:49:14","date_gmt":"2026-05-29T07:49:14","guid":{"rendered":"https:\/\/forklog.com\/en\/?p=97658"},"modified":"2026-05-29T10:51:52","modified_gmt":"2026-05-29T07:51:52","slug":"what-are-quantum-computing-and-quantum-computers","status":"publish","type":"post","link":"https:\/\/forklog.com\/en\/what-are-quantum-computing-and-quantum-computers\/","title":{"rendered":"What Are Quantum Computing and Quantum Computers?"},"content":{"rendered":"
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What is quantum mechanics, and why do its laws defy everyday logic?<\/h2>\n

Quantum mechanics is a fundamental theory in physics that studies the laws of motion, interaction and behavior of microparticles (atoms, molecules, electrons). In this microworld, energy is emitted or absorbed not as a continuous stream but in discrete packets\u2014quanta.<\/p>\n

Although the entire universe ultimately obeys quantum laws (they apply at any scale), understanding this \u201cmicrocosm\u201d through everyday intuition is nearly impossible. At the atomic and subatomic level, classical physics breaks down and reality clashes with common logic\u2014reflected in several principles.<\/p>\n

Quantum superposition<\/strong><\/p>\n

In the familiar macroscopic world, objects always have a definite state: a transistor switch is either on or off\u2014\u201c0\u201d or \u201c1.\u201d A quantum system, as long as it is isolated, exists in a superposition\u2014a mathematical combination of all states available to it. This means that until measurement, an electron\u2019s reality has no single definite value and is described only by a spectrum of probabilities.<\/p>\n

Wave\u2013particle duality and Heisenberg\u2019s uncertainty principle<\/strong><\/p>\n

Microscopic objects are neither classical solid particles nor classical waves; they can display properties of both depending on how they are observed. According to Heisenberg\u2019s uncertainty principle, the impossibility of simultaneously determining a particle\u2019s position and momentum with arbitrary precision follows from its fundamental quantum nature, not from imperfect instruments.<\/p>\n

Observer effect<\/strong><\/p>\n

At the quantum level, \u201cobservation\u201d is a physical interaction with the system. While it is isolated, superposition persists. Measurements force particles to assume one of the possible states\u2014manifesting decoherence.<\/p>\n

Visualization through probabilities<\/strong><\/p>\n

Quantum objects cannot be observed in the usual optical range, but scientists have learned to \u201csee\u201d them with scanning tunneling microscopes. They visualize not the particle itself, but a \u201cmap\u201d of where it is most likely to be in the form of electron clouds<\/span>, confirming the wave nature of matter.<\/p>\n<\/div>\n

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What is quantum computing?<\/h2>\n

In the 1920s, physicists Werner Heisenberg, Erwin Schr\u00f6dinger and Paul Dirac built a theory that explained and linked the observable effects of the microworld to mathematical laws. The main tool was the wave function, which sets the amplitudes of states. On its basis, scientists calculated probabilities and, using an equation, described how they change over time.<\/p>\n

Decades later, scientists learned to use quantum mechanics to process data. Quantum computing systems (QCS) operate on qubits (quantum bits). <\/p>\n

Classical computers are built on the ordinary bit\u2014a categorical quantity that always has a definite value: either \u201c0\u201d or \u201c1.\u201d A qubit\u2019s key difference lies in superposition, which removes classical rigidity. Until physical measurement, the element is not fixed in any basis state. Instead, it is a complex spectrum where probability amplitudes are mathematically intertwined and can ultimately yield a result of zero or one. <\/p>\n

To tie qubits into a QCS, quantum entanglement is used\u2014strict mathematical correlations between particles. Measuring one qubit correlates with the result of measuring another if the system was entangled. This does not allow information to travel faster than light, but it exponentially expands the system\u2019s computational space: each new qubit doubles the dimensionality of possible states.<\/p>\n

Scientists have learned to control qubits with microwave pulses and precisely targeted laser shots. Today several hardware platforms are advancing in parallel:<\/p>\n