We propose and experimentally demonstrate a simple and efficient scheme for photonic communication between two remote superconducting modules. Each module consists of a random access quantum information processor with eight-qubit multimode memory and a single flux tunable transmon. The two processor chips are connected through a one-meter long coaxial cable that is coupled to a dedicated "communication" resonator on each chip. The two communication resonators hybridize with a mode of the cable to form a dark "communication mode" that is highly immune to decay in the coaxial cable. We modulate the transmon frequency via a parametric drive to generate sideband interactions between the transmon and the communication mode. We demonstrate bidirectional single-photon transfer with a success probability exceeding 60 %, and generate an entangled Bell pair with a fidelity of 79.3 ± 0.3 %.
@article{arxiv.1804.02028,
title = {Deterministic Bidirectional Communication and Remote Entanglement Generation Between Superconducting Quantum Processors},
author = {N. Leung and Y. Lu and S. Chakram and R. K. Naik and N. Earnest and R. Ma and K. Jacobs and A. N. Cleland and D. I. Schuster},
journal= {arXiv preprint arXiv:1804.02028},
year = {2018}
}