We address quantum state reconstruction for d-dimensional systems based on measuring, on the system of interest and a probe, of a single entangled observable defined on the bipartite system/probe Hilbert space. We show that the statistics of the measurement and the knowledge of the probe preparation suffice to reliably reconstruct the density matrix of the system, as well as the expectation value of any desired operator, including those not corresponding to observable quantities. The statistical robustness of the reconstruction is examined and a method is developed to minimize statistical errors by tuning the probe preparation. Numerical simulations of the whole reconstruction procedure are also presented for qubit systems.
|Titolo:||Quantum state reconstruction by entangled measurements|
|Autori interni:||PARIS, MATTEO (Ultimo)|
|Parole Chiave:||Hilbert spaces ; numerical analysis ; quantum computing ; quantum entanglement ; statistical analysis|
|Settore Scientifico Disciplinare:||Settore FIS/03 - Fisica della Materia|
|Data di pubblicazione:||2006|
|Digital Object Identifier (DOI):||10.1140/epjd/e2006-00129-8|
|Appare nelle tipologie:||01 - Articolo su periodico|