Index page for an ongoing tutorial series on the current Qiskit stack: primitives, transpilation, and variational algorithms.

PUBs, precision, and noise models — then statevector, density matrix, MPS, and stabilizer simulation benchmarked head to head: two exponentials caught in the act, a measured MPS/statevector crossover, and the 4ⁿ density matrix weighed in resident memory.

Parameterized circuits, a hand-built hardware-efficient ansatz, and a transpiler benchmark: linear vs. all-to-all entanglement across optimization levels on two device topologies.

Bell, Ψ⁺, and GHZ states through SamplerV2 and EstimatorV2 — and why the two primitives exist.