Abstract
Eigenvalues of a density matrix characterize well the quantum state's properties, such as coherence and entanglement. We propose a simple method to determine all the eigenvalues of an unknown density matrix of a finite-dimensional system in a single experimental setting. Without fully reconstructing a quantum state, eigenvalues are determined with the minimal number of parameters obtained by a measurement of a single observable. Moreover, its implementation is illustrated in linear optical and superconducting systems.
Original language | English |
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Article number | 012117 |
Journal | Physical Review A - Atomic, Molecular, and Optical Physics |
Volume | 89 |
Issue number | 1 |
DOIs | |
Publication status | Published - 2014 Jan 21 |
ASJC Scopus subject areas
- Atomic and Molecular Physics, and Optics