2.2.1 Multiqubit systems

Course subject(s) Module 2: Working with Multiple Qubits

So far you learned how to express a single qubit state in the braket notation and its representation on the Bloch sphere. In this video, David will explain how these concepts extend to two and multiple qubit systems.

  • A two-qubit state can be represented in a four dimensional basis, i.e. with a set of four complex numbers.
  • Only six real parameters are needed to uniquely specify a two-qubit
  • One can construct a basis for the two-qubit space by combining an orthonormal basis from each single qubit space
  • An n qubit register can be in a linear superposition of¬† 2n states
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