2017/05/24 by Jaehak Lee, Jiyong Park, Hyunchul Nha · 4 citations
Computer Science · Mathematics · Physics and Astronomy · #Computer science #Fidelity #Formalism (music) #Gaussian #Mathematics #No-teleportation theorem #Physics #Quantum #Quantum Computing Algorithms and Architecture #Quantum Information and Cryptography #Quantum Mechanics and Applications #Quantum channel #Quantum entanglement #Quantum mechanics #Quantum network #Quantum state #Quantum teleportation #Statistical physics #Superdense coding #Telecommunications #Teleportation #Topology (electrical circuits) #quant-ph
paper · pdf · doi:10.1103/physreva.95.052343
published in Physical Review A 95(5) (American Physical Society) · 8 pages, 4 figures, published version
openalex publication_date 2017/05/24 · arxiv created 2017/05/29 · arxiv updated 2017/05/30 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
Quantum teleportation is one of the crucial protocols in quantum information processing. It is important to accomplish an efficient teleportation under practical conditions, aiming at a higher fidelity desirably using fewer resources. The continuous-variable (CV) version of quantum teleportation was first proposed using a Gaussian state as a quantum resource, while other attempts were also made to improve performance by applying non-Gaussian operations. We investigate the CV teleportation to find its ultimate fidelity under energy constraint identifying an optimal quantum state. For this purpose, we present a formalism to evaluate teleportation fidelity as an expectation value of an operator. Using this formalism, we prove that the optimal state must be a form of photon-number entangled states. We further show that Gaussian states are near optimal, while non-Gaussian states make a slight improvement and therefore are rigorously optimal, particularly in the low-energy regime.