Optimal joint remote state preparation of equatorial states

TL;DR

This paper introduces an optimized protocol for joint remote state preparation of equatorial states, achieving deterministic success and generalizing to N-qubit states with perfect fidelity.

Contribution

The authors develop a modified scheme that doubles success probability and extends to N-qubit states with guaranteed success, surpassing previous methods.

Findings

Success probability increased from 25% to 50% with additional classical info

Achieves deterministic preparation of two-qubit equatorial states

Generalizes to N-qubit states with 100% success rate

Abstract

We present a scheme for optimal joint remote state preparation of two-qubit equatorial states. Our protocol improves on a previous scheme (B. S. Choudhury and A. Dhara 2015 Quantum Inf. Process. 14 373) 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.