TY - JOUR
AU - Andrew Higginbotham
AU - Peter Burns
AU - Maxwell Urmey
AU - R. Peterson
AU - N. Kampel
AU - Benjamin Brubaker
AU - Graeme Smith
AU - Konrad Lehnert
AU - Cindy Regal
AB - An optical network of superconducting quantum bits (qubits) is an appealing platform for quantum communication and distributed quantum computing, but developing a quantum-compatible link between the microwave and optical domains remains an outstanding challenge. Operating at T < 100 mK temperatures, as required for quantum electrical circuits, we demonstrate a mechanically mediated microwave–optical converter with 47% conversion efficiency, and use a classical feed-forward protocol to reduce added noise to 38 photons. The feed-forward protocol harnesses our discovery that noise emitted from the two converter output ports is strongly correlated because both outputs record thermal motion of the same mechanical mode. We also discuss a quantum feed-forward protocol that, given high system efficiencies, would allow quantum information to be transferred even when thermal phonons enter the mechanical element faster than the electro-optic conversion rate.
BT - Nature Physics
DA - 2018-07
DO - 10.1038/s41567-018-0210-0
N2 - An optical network of superconducting quantum bits (qubits) is an appealing platform for quantum communication and distributed quantum computing, but developing a quantum-compatible link between the microwave and optical domains remains an outstanding challenge. Operating at T < 100 mK temperatures, as required for quantum electrical circuits, we demonstrate a mechanically mediated microwave–optical converter with 47% conversion efficiency, and use a classical feed-forward protocol to reduce added noise to 38 photons. The feed-forward protocol harnesses our discovery that noise emitted from the two converter output ports is strongly correlated because both outputs record thermal motion of the same mechanical mode. We also discuss a quantum feed-forward protocol that, given high system efficiencies, would allow quantum information to be transferred even when thermal phonons enter the mechanical element faster than the electro-optic conversion rate.
PY - 2018
EP - 1038–1042
T2 - Nature Physics
TI - Harnessing electro-optic correlations in an efficient mechanical converter
UR - https://www.nature.com/articles/s41567-018-0210-0
VL - 7
SN - 1745-2473
ER -