QUROPE Quantum Information Processing and Communication in Europe

L. Steffen, Y. Salathe, M. Oppliger, P. Kurpiers, M. Baur, C. Lang, C. Eichler, G. Puebla-Hellmann, A. Fedorov and A. Wallraff.
Nature 500, 319-322 (2013)

Demonstrations of primitive information processing elements with quantum bits (qubits) have been
implemented in many systems, but the requirements for precise quantum control, along with fast classical
feed-forward (conditioning future operations on measurement results) has proved challenging.

In their work, Steffen and colleagues demonstrate quantum teleportation on a chip-based superconducting
architecture. A successful teleportation requires a rotation of a target qubit conditional on the transmission of
a measurement result on the control qubit. The authors show that these conditional operations can be
implemented deterministically, opening the path to large-scale superconducting circuits with feed-forward.