Question 1

What is Quantum Lab?

Accepted Answer

Quantum Lab is a free interactive platform for learning quantum mechanics. It includes a drag-and-drop quantum circuit simulator with live Bloch sphere feedback, a structured course with 7 learning modules, guided experiments you can run in the simulator, and a 3D cryostat wiring designer that shows how real quantum hardware is built. Everything works in the browser.

Question 2

Is Quantum Lab free?

Accepted Answer

All learning content is free forever — every lesson, experiment, gate reference, quiz, and the full interactive course. The circuit simulator and cryostat designer are also free to use. Pro adds power features: unlimited qubits, circuit saving, OpenQASM export, cryostat design export, and a personalized Learning Intelligence dashboard.

Question 3

What is a quantum circuit simulator?

Accepted Answer

A quantum circuit simulator lets you build quantum algorithms by placing gates on qubit wires, then simulates the quantum state evolution step by step. Unlike a real quantum computer, a simulator computes the exact state vector, so you can see every amplitude, probability, and phase. This makes it an ideal learning tool.

Question 4

What is the Quantum Wiring Studio?

Accepted Answer

The Wiring Studio is a 3D interactive tool for designing the wiring inside a dilution refrigerator — the machine that cools quantum processors to near absolute zero. You can explore realistic pre-built cryostat architectures, inspect each temperature stage and component, see how signal cables are routed, and run thermal simulations.

Question 5

Do I need prior knowledge of physics or math?

Accepted Answer

No. The course starts from zero and defines every term before using it. You do not need linear algebra, complex numbers, or any physics background. The platform builds your intuition through interactive experiments first, then introduces the math as a summary of what you already understand.

Question 6

How many qubits can I simulate?

Accepted Answer

Free users can simulate circuits with up to 3 qubits. Pro users have no qubit limit. The simulator runs entirely in your browser using exact state vector math. Noise simulation is available for circuits up to 8 qubits regardless of plan.

Question 7

Can I share my quantum circuits?

Accepted Answer

Yes. Every circuit can be shared as a URL — the circuit state is encoded in the link, so anyone who opens it sees exactly what you built. No sign-in is needed to view a shared circuit. Pro users can also export circuits as OpenQASM 2.0 or JSON.

Question 8

What is a Bloch sphere?

Accepted Answer

The Bloch sphere is a geometric representation of a single qubit's state. The north pole represents |0>, the south pole represents |1>, and every point on the surface represents a valid quantum state. Quantum gates rotate the state vector on the sphere.

Question 9

Why do quantum computers need to be so cold?

Accepted Answer

Superconducting qubits operate at about 15 millikelvin — colder than outer space. At this temperature, thermal energy is far below the qubit transition energy, so the qubit starts reliably in its ground state. Heat causes decoherence, destroying the quantum interference patterns that algorithms depend on.

Question 10

How do I cancel my Pro subscription?

Accepted Answer

Go to your profile page and click Manage Billing. This opens the Stripe billing portal where you can cancel. Cancellation takes effect at the end of your current billing period — you keep full Pro access until then. No questions asked, no cancellation fees.

Frequently Asked Questions

What is Quantum Lab?

Do I need any prior knowledge of physics or math?

Is this free?

How do I start learning?

What can I do in the circuit simulator?

What gates are available?

How does step-by-step mode work?

Can I simulate noise and errors?

How many qubits can I simulate?

How is the course structured?

What are guided experiments?

How does progress tracking work?

Do quizzes affect anything?

Can I jump to any topic or do I need to follow the order?

What is the Quantum Wiring Studio?

Can I build my own cryostat design?

How does thermal simulation work?

What are the pre-built presets?

Can I share my circuits with others?

What export formats are supported?

Can I import circuits from other tools?

How do I sign in?

What does Pro include?

How do I cancel my subscription?

Can I delete my account?

What browsers are supported?

Does the simulator work on mobile?

Is my data private?