Abstract
After reviewing the earlier ideas to measure the purity of a quantum system, a new scheme for the measurement of purity is presented, which aims at providing a simple, direct and efficient procedure without resorting to quantum state tomography. The scheme is also illustrated in the Bloch-vector representation for a two-level quantum system (qubit) and for a general D-level quantum system. As a variant, a simple example implemented in a one-dimensional scattering process to measure the purity of the target qubit is also given.
| Original language | English |
|---|---|
| Article number | 1440009 |
| Journal | Open Systems and Information Dynamics |
| Volume | 21 |
| Issue number | 1-2 |
| DOIs | |
| Publication status | Published - 2014 Jun |
ASJC Scopus subject areas
- Statistical and Nonlinear Physics
- Statistics and Probability
- Mathematical Physics
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Tanaka, T., & Nakazato, H. (2014). Measurement of purity, the simplest nonlinear functional of the density matrix. Open Systems and Information Dynamics, 21(1-2), [1440009]. https://doi.org/10.1142/S1230161214400095