Program

P.48 -- Poster, NCTP-40

Date: Tuesday, 28 July 2015

Time: 08h30 - 10h00

Controlled joint remote preparation of an arbitrary two-qubit state via nonmaximally entangled quantum channels

Cao Thi Bich (1), Nguyen Van Hop (2) and Nguyen Ba An (1)

(1) Center for Theoretical Physics, Institute of Physics, 10 Dao Tan, Hanoi (2) Physics Department, Hanoi University of Education No. 1, 136 Xuan Thuy, Hanoi

Remote preparation of quantum states only by means of local operation and classical communication is highly favorable for global quantum information processing and distributed quantum computation. Because security is the most highlighted issue remote state preparation was extended to joint remote state preparation whose security can be further enhanced by adding a third powerful party, a controller, who reserves the right to push the "launch button" for an intended task. This is called joint remote state preparation under control or controlled joint remote state preparation. Here we consider preparation of a general two-qubit state using nonmaximally entangled quantum channels in the forms of (i) two four-qubit states, (ii) one four-qubit state plus one three-qubit GHZ state and (iii) a single seven-qubit state. We design schemes to generate all the three types of the quantum channel whose parameters are on-purpose given to the controller (not to the receiver as in most previous protocols) so that only he/she is able to correctly manage the operation on his/her qubits. By arranging the preparers to follow the adaptive measurement strategy all our three protocols succeed deterministically.

Presenter: Nguyen Van Hop