Deterministic Bidirectional Communication and Remote Entanglement Generation Between Superconducting Quantum Processors
Leung, N., Yao Lu, Srivatsan Chakram, Ravi Naik, Nathan Earnest, Ruichao Ma, Kurt A. Jacobs, Andrew N. Cleland, David Schuster · arXiv (Cornell University) · 2018
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 $\pm$ 0.3 %.