Foundations · Michael Nielsen

Partial measurements

Name: Partial measurements
Uploaded: 2010-12-06
Description: What changes when only part of a quantum system is measured? Michael Nielsen introduces partial measurement in this mathematical lesson. It is a next step after multi-qubit states and basic measurement, helping learners reason about a subsystem without treating every experiment as a readout of the entire register.

Original upload Dec 6, 2010

Engineers installing an IBM Quantum System One cryogenic assembly at Fraunhofer

Context photo · Holger Muench / IBM · CC BY 2.0

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Engineers install IBM Quantum System One at Fraunhofer. Archival quantum-computing context, not a video frame or the apparatus of another study.

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What changes when only part of a quantum system is measured? Michael Nielsen introduces partial measurement in this mathematical lesson. It is a next step after multi-qubit states and basic measurement, helping learners reason about a subsystem without treating every experiment as a readout of the entire register.

Video by Michael Nielsen. Added to QubitWire September 29, 2026.

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