Quantum communication between superconducting qubits using flying microwave photons over low-loss interconnects

Marked by the demonstration of quantum advantage, superconducting quantum circuits have seen remarkable progress towards scalable quantum computation in the past few years. However, along with the scaling comes formidable emerging technical challenges such as the available chip size, the cooling power and the wiring complexity. Distributed quantum computational networks based on superconducting qubits promise further scalability beyond single chip or even single cryostat, where flying microwave photons at cryogenic temperatures are used as information carriers for quantum communication between distant superconducting chips. However, the fidelities of quantum state transfer and remote entanglement have been confined to ~80% to date[1-4], hindered by inefficient transfer of flying microwave photons over lossy interconnects. In this talk, I will present our recent experimental progress in quantum communication between superconducting qubits using flying microwave photons over low-loss interconnects.

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

[2] Axline, C. J. et al. Nat. Phys. 14, 705–710 (2018).

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

[4] P. Magnard et al. Phys. Rev. Lett. 125, 260502 (2020).