In the next three videos Niels, Brian and Adriaan will give you insight in the way we perform operations on the transmon qubit. Niels Bultink will start in this first video by explaining more about measurements.

Main takeaways

• A transmon qubit can be measured via a readout resonator that is coupled to it. Depending on the qubit state, there will be an observable shift in the resonator frequency.

• To quantify how well qubit measurement is performing in the presence of this noise, we record the integrated voltage of thousands of individual traces. By plotting these individual shots in the histograms, we extract the fidelity of the measurement.
• The highest achievable fidelity aided by the world’s lowest noise, superconducting amplifiers is 99%.
• To allow simultaneous readout for multiple qubits, each qubit will be coupled to its own resonator with unique lengths and thus readout frequency.