Observation of Entanglement between Itinerant Microwave Photons and a Superconducting Qubit
C. Eichler, C. Lang, J. M. Fink, J. Govenius, S. Filipp, A. Wallraff
DOI 10.1103/PhysRevLett.109.240501 · Physical Review Letters
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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.
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