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Fundamentals

01 /Quantum computers with magical advantage? 02 /Bra-ket notation 03 /Born rule 04 /Bloch sphere 05 /Measurement operators 06 /Experimental and theoretical measurements 07 /How to measure in any basis 08 /State decomposition 09 /Why every maximally entangled state is secretly a Bell state 10 /Coherence 11 /Relaxation 12 /Quantum materials: the environment of a qubit 13 /Introduction to quantum error correction (QEC) 14 /Multiqubit systems 15 /Multiqubit gates 16 /Entanglement 17 /Measuring multiqubit systems 18 /Superdense coding 19 /Teleportation 20 /Entanglement swapping

Experimental and theoretical measurements

Quantum measurements is one of the most important topics when starting to study quantum mechanics. In the context of quantum computing, many (theoretical) algorithms consist of measurements in the X, Y, or Z basis. But how do we perform these measurements in experiments?

In this video, Postdoctoral Researcher Ben Criger (QuTech) gives an example of measuring an experiment in the Z-basis.
 

Required knowledge

 

Further thinking

In the video, Ben Criger shows how the current has a significant bump before arriving at the place where there is a state-dependent current. Do you think that the height of this first peak (which is independent of the spin state) matters? Why does it (not) matter?

Further reading

If you are interested in more examples of measurements on qubits in real experiments, take a look at the corresponding section on this platform: Quantum computer.