Conditional density matrix: subsystems in quantum communication

V. V. Belokurov; O. A. Khrustalev; V. A. Sadovnichy; O. D. Timofeevskaya

doi:10.1117/12.517875

23 July 2003 Conditional density matrix: subsystems in quantum communication

V. V. Belokurov, O. A. Khrustalev, V. A. Sadovnichy, O. D. Timofeevskaya

Proceedings Volume 5128, First International Symposium on Quantum Informatics; (2003) https://doi.org/10.1117/12.517875
Event: First International Symposium on Quantum Informatics, 2002, Lipki, Russian Federation

Abstract

A new quantum mechanical notion - Conditional Density Matrix - proposed by the authors, is discussed and is applied to describe some physical processes. This notion is a natural generalization of von Neumann density matrix for such processes as divisions of quantum systems into subsystems and reunifications of subsystems into new joint systems. Conditional Density Matrix assigns a quantum state to a subsystem of a composite system under condition that another part of the composition system is in some pure state. It is shown that conditional density matrix naturally arises by expanding of reduced density matrix.

Citation Download Citation

V. V. Belokurov, O. A. Khrustalev, V. A. Sadovnichy, and O. D. Timofeevskaya "Conditional density matrix: subsystems in quantum communication", Proc. SPIE 5128, First International Symposium on Quantum Informatics, (23 July 2003); https://doi.org/10.1117/12.517875

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