Bidirectional multi-photon communication between remote superconducting resonators

Quantum communication protocols based on multi-photon states can support larger transmitted information density than those relying on single photon states. Quantum networks based on superconducting circuits have been used to synthesize and transmit arbitrary qubit [1,2] and multi-photon resonator states [3] between nodes. Itinerant communication between nodes has been limited to single photons [4]. Here we demonstrate bidirectional multiphoton transfers between two remote tunable resonators in a superconducting system, enabling single-pass on-demand transfers of photon superposition states.

[1] P. Kurpiers, et al, Nature, 558, 264-267 (2018)

[2] P. Campagne-Ibarcq, et al, Phys. Rev. Lett., 120, 200501 (2018)

[3] C. J. Axline, et al, Nature Physics, 14, 705-710 (2018)

[4] Y. Zhong, et al, Nature Physics, (2019)