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quantum circuit builder simulator 2 qubit in browser skip to main content quantumcomputing courses com courses all courses course platforms coursera edx udemy brilliant hardware providers google quantum ai ibm quantum ionq quantinuum amazon braket azure quantum quera rigetti d wave tutorials all tutorials hello world qiskit hello world cirq hello world pennylane hello world braket quantum gates grover s algorithm shor s algorithm reference all frameworks qiskit cirq pennylane amazon braket pyquil tket d wave ocean q explore learn learning paths prerequisites programming guide case studies glossary books quantum news podcasts tools bloch sphere quantum pinball guides algorithm guide hardware guide qubit types framework comparison migration guide language timeline cheat sheets career events 2026 jobs careers certifications salary guide universities interview prep faq troubleshooting about about team search browse courses home circuit builder quantum circuit builder build a 2 qubit circuit by clicking gates onto each wire the state vector and measurement probabilities update in real time bell state preset is one click away h x y z s t cnot q0 q1 cnot q1 q0 apply to q0 apply to q1 undo clear bell state 0 cnot entangle state vector amplitudes shown as a bi the basis states are 00 01 10 11 q1 q0 measurement probabilities probability of each outcome if you measure both qubits in the computational basis export as openqasm 3 how to read the output a 2 qubit state lives in a 4 dimensional complex vector space the four basis states are 00 01 10 11 and any state is a complex superposition of them the amplitudes you see are those complex coefficients squaring each amplitude gives the probability of measuring that bitstring try the bell state preset h on q0 then cnot q0 q1 you ll see 00 and 11 both at probability 0 5 and 01 and 10 at 0 that s entanglement the two qubits are perfectly correlated even though neither has a definite value alone for more see our quantum gates tutorial the gates cheat sheet or the single qubit bloch sphere simulator get one quantum email a week new tutorials courses worth taking and what changed in qiskit cirq pennylane this week no spam unsubscribe anytime email address subscribe 112 courses 220 tutorials 241 glossary terms 26 framework references 34 case studies quantumcomputing courses com free tutorials curated courses framework references and tools for anyone learning quantum computing written and maintained by dr donovan who writes on quantum computing research hardware and industry at quantum zeitgeist learn all courses free tutorials learning paths compare frameworks algorithm guide case studies quantum news reference glossary framework docs hardware guide qubit types history timeline cheatsheets bloch sphere quantum programming careers careers guide salary guide certifications interview questions jobs team training post a job talent pool about about this site editorial policy team faq events 2026 podcasts books contact as an amazon associate i earn from qualifying purchases 2026 hadamard llc quantumcomputingcourses com affiliate disclosure privacy terms cookies we use cookies to improve your experience and track affiliate performance see our cookie policy decline accept