Quantum Communication Between Distant Superconducting Circuits Combined With Fast, High-Fidelity Readout*

Deterministic chip-to-chip quantum protocols between distant quantum processors are a promising route for scaling up quantum computers. Through the emission and absorption of single microwave photons these protocols [1,2,3,4] allow for quantum communication between superconducting circuits located on separate chips, also at meter-scale distances [5]. In order to achieve high fidelities in these algorithms, the photon emission and absorption must be fast and reliable.
At the same time, fast high-fidelity readout of the qubits is key for applications ranging from quantum computing algorithms to tests of fundamental physics. Both features require a careful selection of the device parameters. In this talk, we present the main challenges and a first implementation of a superconducting circuit fulfilling the aforementioned needs.

[1] C. Axline et al., Nature Physics 14, 705 (2018)
[2] P. Campagne-Ibarcq et al., PRL 120, 200501 (2018)
[3] P. Kurpiers et al., Nature 558, 264 (2018)
[4] N. Leung et al., npj Quantum Information 5, 18 (2019)
[5] P. Magnard et al., arXiv:2008.01642 (2020)