Bell State Experiment in IBM Quantum Composer – A Complete Step-by-Step Guide
Bell State Experiment in IBM Quantum Composer – A Complete Step-by-Step Guide The Bell State experiment is one of the first experiments every quantum computing student performs. It demonstrates one of the most fascinating phenomena in quantum mechanics—quantum entanglement. In this experiment, two qubits become so strongly correlated that measuring one instantly determines the state of the other, regardless of the distance between them. IBM Quantum Composer makes it possible to build and execute this experiment on both a simulator and real IBM quantum hardware without writing code. The standard Bell-state circuit uses a Hadamard (H) gate followed by a Controlled-NOT (CX) gate to create the entangled state Φ⁺ = (|00⟩ + |11⟩)/√2. --- What is a Bell State? A Bell State is the simplest example of quantum entanglement. Unlike classical bits, which are either 0 or 1, quantum bits (qubits) can exist in multiple states simultaneously. When two qubits become entangled, they behave as one q...