[15a-A305-1~12] 3.15 Optics and Photonics English Session

▲ [15a-A305-7] Performance of Rotation-Symmetric Bosonic Codes in a Quantum Repeater Scheme based on Cavity-QED

〇(D)Peizhe Li^1,2,3, Nicolo lo Piparo^2,3, Josephine Dias^2,3, William Munro^4,3, Peter van Loock⁵, Kae Nemoto^2,3,1 (1.SOKENDAI, 2.OIST, 3.NII, 4.NTT Basic Res. labs, 5.Uni. Mainz)

Keywords:quantum communication, quantum information, quantum key distribution

Quantum error correction codes based on continuous variables plays an important role for the implementation of quantum communication systems. A natural application of such codes occurs within quantum repeater systems which are usually affected by severe channel losses and local gate errors. In particular, channel loss drastically reduces the distance of communication between remote users. Here we consider a cavity-QED based repeater scheme to address the losses in the quantum channel. This repeater scheme relies on the transmission of a specific class of rotationally invariant error-correcting codes. We compare several rotation-symmetric bosonic codes (RSBCs) being used to encode the initial states of two remote users connected by a quantum repeater network. We quantify the performance of the system using the secret key rate and determine the number of stations required to exchange a secret key over a fixed distance.