Quantum Inf Process (2015) 14:4585–4592
Optimal joint remote state preparation of equatorial
· Shohini Ghose
Received: 24 June 2015 / Accepted: 29 September 2015 / Published online: 8 October 2015
© Springer Science+Business Media New York 2015
Abstract We present a scheme for optimal joint remote state preparation of two-
qubit equatorial states. Our protocol improves on a previous scheme (Choudhury
and Dhara in Quantum Inf Process 14:373–379, 2015) that had a success probability
of 25 %, which increased to 50 % when extra classical information is sent to the
receiver. We show that using our modiﬁed scheme, the desired state can be prepared
deterministically with the same quantum channel. Moreover, we generalize the scheme
to prepare N -qubit equatorial states in which the receiver can reconstruct the original
state with 100 % success probability.
Keywords Joint remote state preparation · Equatorial N -qubit state · Succeed
Remote state preparation (RSP) , like quantum teleportation , is a novel way
to transmit a quantum state between distant parties without physically sending the
X.L. is supported by the National Natural Science Foundation of China under Grant No. 11574038 and
the Fundamental Research Funds for the Central Universities under Grant No. CQDXWL-2012-014. S.G.
acknowledges support from the Ontario Ministry of Research and Innovation and the Natural Sciences
and Engineering Research Council of Canada.
Department of Physics, Chongqing University, Chongqing 401331, China
Department of Physics and Computer Science, Wilfrid Laurier University, Waterloo N2L 3C5,
Institute for Quantum Computing, University of Waterloo, Waterloo N2L 3G1, Canada