Volume 84, Number 5, December 2008
|Number of page(s)||6|
|Published online||26 November 2008|
Optimal controlled teleportation
College of Mathematics and Information Science, Hebei Normal University - Shijiazhuang 050016, China
2 Max-Planck-Institut für Quantenoptik - Hans-Kopfermann-Str. 1, D-85748 Garching, Germany, EU
3 College of Physics Science and Information Engineering, Hebei Normal University - Shijiazhuang 050016, China
Corresponding author: email@example.com
Accepted: 22 October 2008
We study the general case of controlled quantum teleportation and give analytic expressions for the maximal probabilities of successful controlled teleportation of an unknown qubit via every kind of three-qubit state. We also give an explicit expression for the three-qubit states that can be used as quantum channel for controlled teleportation of an unknown state with unit probability and with unit fidelity. In addition, an exact value of localizable entanglement is determined. We obtain the necessary and sufficient condition that a three-qubit state can be collapsed to an EPR pair by a measurement on one qubit.
PACS: 03.67.Hk – Quantum communication
© EPLA, 2008
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