Observation of entanglement between itinerant microwave photons and a superconducting qubit.
Phys Rev Lett
; 109(24): 240501, 2012 Dec 14.
Article
en En
| MEDLINE
| ID: mdl-23368292
ABSTRACT
A localized qubit entangled with a propagating quantum field is well suited to study nonlocal aspects of quantum mechanics and may also provide a channel to communicate between spatially separated nodes in a quantum network. Here, we report the on-demand generation and characterization of Bell-type entangled states between a superconducting qubit and propagating microwave fields composed of zero-, one-, and two-photon Fock states. Using low noise linear amplification and efficient data acquisition we extract all relevant correlations between the qubit and the photon states and demonstrate entanglement with high fidelity.