1.7.1 The partial trace
In this video we consider a fundamental operation on quantum systems: the partial trace. This operation tells you how to describe the state of a subsystem of a larger system, by computing its “reduced density matrix” from a description (pure state or density matrix) of the larger system.
Quantum Cryptography by TU Delft OpenCourseWare is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License.
Based on a work at https://ocw.tudelft.nl/courses/quantum-cryptography/.