Volume 86, Number 4, May 2009
|Number of page(s)||3|
|Published online||04 June 2009|
Describing a quantum channel by state tomography of a single probe state
School of Physics and Optoelectronic Technology, Dalian University of Technology - Dalian 116024, PRC
Accepted: 4 May 2009
A general law is presented for (composite) quantum systems which directly describes the time evolution of quantum states (with one or both components) through an arbitrary noisy quantum channel. It is shown that the time evolution of all quantum states through a quantum channel can be completely captured by the evolution of a single “probe state". Thus, in order to grasp the information of the final output states subject to a quantum channel, especially an unknown one, only quantum state tomography of a single probe state is required, which dramatically simplifies the practical operations in experiment.
PACS: 03.65.Ud – Entanglement and quantum nonlocality (e.g. EPR paradox, Bell's inequalities, GHZ states, etc.) / 42.50.Dv – Quantum state engineering and measurements / 03.65.Ta – Foundations of quantum mechanics; measurement theory
© EPLA, 2009
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.