Quantum gates are the essential building blocks of quantum circuits and quantum algorithms. While classical logic gates transform bits that are 0 or 1, quantum gates operate on qubits in superposition, which take on a complex value; some charaterise this as a mixture of both 0 and 1 at the same time. This enables quantum computers to explore a much larger problem space than classical computers.
Each quantum gate transforms a qubit’s quantum state according to precise mathematical rules. Single-qubit gates can place a qubit into superposition or adjust its phase. These operations can be visualised as rotations on the Bloch sphere.
Multi-qubit gates create entanglement between qubits, which enables quantum computation. A key concept is the universal gate set: any quantum computation can be built from a small collection of basic gates, provided the set includes single-qubit operations plus at least one entangling two-qubit gate. This universality principle underpins quantum processor design, ensuring a finite set of physical operations can execute any quantum algorithm.
For silicon-based quantum processors, achieving high gate fidelity is essential for building toward fault-tolerant quantum computing at scale.
Related Links
- Probabilistic Interpolation of Quantum Rotation Angles | Quantum Motion Research
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