Quantum Active 2025
QuSim2
Interactive quantum simulator web app
The problem
QuSim (the from-scratch Python simulator) is a research tool, not something you can hand someone with no setup - quantum circuits and their effects need to be explorable in a browser, interactively, with visuals that make the physics legible.
The approach
Built QuSim2, a Next.js web app where users write OpenQASM 2.0 with syntax highlighting, simulate it client-side, and see the results as an animated Bloch sphere, entanglement graphs, phase-space and measurement histograms, and circuit statistics - with algorithm templates and an AI assistant to lower the barrier further.
QuSim2 is the interactive, browser-based counterpart to QuSim: instead of a Python research simulator, it’s a web app for editing, running, and visualizing quantum circuits with zero install.
editor and simulation
Users write circuits directly in OpenQASM 2.0, with syntax highlighting, and the simulator runs entirely client-side - no backend round-trip between editing a gate and seeing the result.
visualization
Results are rendered through several complementary views:
- Animated Bloch sphere - per-qubit state visualized in real time as gates apply.
- Entanglement graphs - which qubits are entangled with which, and how strongly.
- Phase-space and measurement histograms - outcome distributions across repeated shots.
- Circuit statistics - depth, gate counts, and T-count, useful for reasoning about a circuit’s cost.
templates and AI assistant
Common algorithms - Bell states, GHZ states, Grover’s algorithm, the Quantum Fourier Transform - are available as one-click templates. An integrated Gemini-powered AI assistant sits next to the editor to help with circuit construction and explain what a given gate sequence does.
// GHZ state template
OPENQASM 2.0;
include "qelib1.inc";
qreg q[3];
creg c[3];
h q[0];
cx q[0], q[1];
cx q[1], q[2];
measure q -> c;why a second simulator
QuSim is built for depth - four backends, noise modeling, error correction. QuSim2 is built for reach - anyone with a browser can write a circuit and immediately see what it does, which is a different (and equally useful) goal.
What I took away
- Client-side simulation keeps the whole experience zero-install and instant, which matters far more than raw qubit-count ceiling for an interactive/educational tool.
- Visualizing entanglement and phase as a graph and histogram, not just numbers, is what actually builds intuition for people new to quantum computing.
- An AI assistant embedded next to the editor turns 'I don't know what gate to use' from a dead end into forward progress.
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