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Home Courses The Building Blocks of a Quantum Computer: Part 1 Course materials Lectures 4.2.2 Circuit QED

4.2.2 Circuit QED

Course subject(s) Module 4. Superconducting quits

Having learnt about the transmon qubit, let us now learn about how to combine a qubit with resonators that help perform operations on the qubits. During the video, Leo poses a question. If you think you have an answer to his question then participate in the discussion forum titled ‘Forum on circuit QED video’ that you can find below the video!

Main takeaways

  • Circuit quantum electrodynamics (QED) involves the combining of quantum hardware with resonators.
  • In the second-generation processors for superconducting qubits, there are dedicated resonators for readout of each qubit and a commmon ‘bus’ resonator connecting to all the qubits.
  • The frequency of a readout resonator depends on the qubit state; and this dependence is the key ingredient that facilitiates the measurement of qubits.
  • By mediating the inter-qubit interaction on the common ‘bus’ resonator, it is possible to perform two-qubit operations.
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