A physical qubit is the actual physical system used to implement a [[Qubit|qubit]]. While a qubit is an abstract unit of [[Quantum Information|quantum information]], a physical qubit is a real-world object that follows the rules of [[Quantum Mechanics|quantum mechanics]] and can be manipulated to store and process quantum information. There are different ways to realize a physical qubit. The most common implementations include [[Platform - Superconducting Circuits|superconducting circuits]], [[Platform - Ions|trapped ions]], [[Platform - Photons|photonic qubits]] and [[Spin|spin]] qubits. Each physical qubit type has its own advantages and challenges, such as [[Coherence|coherence]] time (how long the qubit retains its quantum state) and error rates. Since quantum systems are fragile, physical qubits require sophisticated isolation and [[Quantum Error Correction|error correction]] techniques to maintain their quantum properties. [[Logical Qubit|Logical qubits]] are built from multiple physical qubits to improve error resistance and enable practical quantum computing. ![[physical_qubits.excalidraw.light.svg]] >[!read]- Further Reading >- [[Quantum Error Correction]] >- [[Qubit]] >- [[Logical Qubit]] >- [[Platforms]] >[!ref]- References