Limitations of teleporting a qubit via a two-mode squeezed state  

作　　者：SEOK HYUNG LIE HYUNSEOK JEONG 

机构地区：[1]Center for Macroscopic Quantum Control, Department of Physics and Astronomy, Seoul National University

出　　处：《Photonics Research》2019年第5期I0001-I0007,共7页光子学研究（英文版）

基　　金：National Research Foundation of Korea(NRF)(2010-0018295);Korea Institute of Science and Technology(KIST)(2E27800-18-P043)

摘　　要：Recently, a teleportation scheme using a two-mode squeezed state to teleport a photonic qubit, so called a“hybrid” approach, has been suggested and experimentally demonstrated as a candidate to overcome the limitations of all-optical quantum information processing. We find, however, that there exists the upper bound of fidelity when teleporting a photonic qubit via a two-mode squeezed channel under a lossy environment.The increase of photon loss decreases this bound, and teleportation better than this limit is impossible even when the squeezing degree of the teleportation channel becomes infinity. Our result indicates that the hybrid scheme can be valid for fault-tolerant quantum computing only when the photon loss rate can be suppressed under a certain limit.Recently, a teleportation scheme using a two-mode squeezed state to teleport a photonic qubit, so called a"hybrid" approach, has been suggested and experimentally demonstrated as a candidate to overcome the limitations of all-optical quantum information processing. We find, however, that there exists the upper bound of fidelity when teleporting a photonic qubit via a two-mode squeezed channel under a lossy environment.The increase of photon loss decreases this bound, and teleportation better than this limit is impossible even when the squeezing degree of the teleportation channel becomes infinity. Our result indicates that the hybrid scheme can be valid for fault-tolerant quantum computing only when the photon loss rate can be suppressed under a certain limit.

关 键 词：TELEPORT a photonic QUBIT experimentally demonstrated photon loss DECREASES 

分 类 号：O4[理学—物理]