Generating spatially entangled itinerant photons with waveguide quantum electrodynamics
Journal article, 2020
Realizing a fully connected network of quantum processors requires the ability to distribute quantum entanglement. For distant processing nodes, this can be achieved by generating, routing, and capturing spatially entangled itinerant photons. In this work, we demonstrate the deterministic generation of such photons using superconducting transmon qubits that are directly coupled to a waveguide. In particular, we generate two-photon N00N states and show that the state and spatial entanglement of the emitted photons are tunable via the qubit frequencies. Using quadrature amplitude detection, we reconstruct the moments and correlations of the photonic modes and demonstrate state preparation fidelities of 84%. Our results provide a path toward realizing quantum communication and teleportation protocols using itinerant photons generated by quantum interference within a waveguide quantum electrodynamics architecture.
Author
Bharath Kannan
Massachusetts Institute of Technology (MIT)
Daniel L. Campbell
Massachusetts Institute of Technology (MIT)
F. Vasconcelos
Massachusetts Institute of Technology (MIT)
Roni Winik
Massachusetts Institute of Technology (MIT)
D. K. Kim
MIT Lincoln Laboratory
M. Kjaergaard
Massachusetts Institute of Technology (MIT)
Philip Krantz
Chalmers, Microtechnology and Nanoscience (MC2)
Massachusetts Institute of Technology (MIT)
Alexander Melville
MIT Lincoln Laboratory
Bethany M. Niedzielski
MIT Lincoln Laboratory
Jonilyn L. Yoder
MIT Lincoln Laboratory
T.P. Orlando
Massachusetts Institute of Technology (MIT)
S. Gustavsson
Massachusetts Institute of Technology (MIT)
William D. Oliver
MIT Lincoln Laboratory
Massachusetts Institute of Technology (MIT)
Science advances
2375-2548 (eISSN)
Vol. 6 41 eabb8780Subject Categories
Atom and Molecular Physics and Optics
Other Physics Topics
Communication Systems
DOI
10.1126/sciadv.abb8780
PubMed
33028523