Qubits on the Bloch sphere, quantum gates, superposition and entanglement — visualised. From the fundamentals of quantum mechanics to Grover's search and quantum cryptography.
This category explains how quantum computers store and process information using qubits instead of classical bits. By exploring each interactive Quantum Computing model you will learn how superposition lets a qubit hold many values at once, how entanglement links qubits into correlated systems, and how unitary gates such as Hadamard, CNOT and the Pauli operators transform quantum states. The simulations walk you from the geometry of the Bloch sphere through to landmark algorithms — Grover's quadratic search speed-up and Shor's polynomial-time factoring — so you build genuine intuition before touching real hardware. Understanding these ideas matters because quantum computing is reshaping cryptography, drug discovery, materials science and optimisation, making it one of the most consequential technologies of the coming decade.
Open a simulation — it runs right in your browser
Deep dives into quantum computing concepts
Qubits, gates, superposition, and quantum algorithms — interactively
Quantum computing simulations model the behaviour of quantum circuits built from qubits and unitary gates. Gate-circuit simulators track the 2ⁿ-dimensional complex state vector of n qubits as Hadamard, CNOT, Toffoli, and phase gates are applied, visualising amplitude and phase on Bloch spheres. Algorithm simulations show Grover's search algorithm achieving √N query complexity and Deutsch-Jozsa returning the global parity of a black-box function in one query.
Quantum error correction simulations demonstrate how the three-qubit bit-flip code and Shor's nine-qubit code detect and correct decoherence errors. These models are computationally exact for small qubit counts and run entirely in the browser using JavaScript complex-number arithmetic. They are ideal for developing an operational understanding of quantum speedup, entanglement, and measurement before working with real quantum hardware APIs.
Quantum computing simulations run on classical hardware by tracking the full 2ⁿ-dimensional state vector — which is why simulating more than ~30 qubits becomes infeasible classically. Real quantum computers from IBM, Google, and IonQ achieve quantum advantage by maintaining physical qubit coherence. These simulations let you build intuition for quantum circuits, interference, and algorithmic speedup without requiring a dilution refrigerator.
Topics and algorithms you'll explore in this category
Common questions about this simulation category
Every interactive Quantum Computing model on this page runs free in your browser, turning abstract theory into something you can see and manipulate. Use a Quantum Computing simulation to test how gates rotate a qubit, how measurement collapses superposition, or how Grover's oracle amplifies the correct answer. Whether you are a student, an educator or a developer preparing to learn Quantum Computing online, these visual tools build the intuition needed for real-world applications such as breaking and designing cryptographic systems, simulating molecules for drug discovery, and solving large-scale optimisation problems.