Direct generation of three-photon polarization entanglement
By Deny Hamel, L. Shalm, H. Hubel, Aaron J. Miller, F. Marsili, V. Verma, R. Mirin, Sae Woo Nam, Kevin J. Resch, T. Jennewein. Nature Photonics, 2014
168 citations recorded by the source corpus.
Non-classical states of light are of fundamental importance for emerging quantum technologies. All optics experiments producing multi-qubit entangled states have until now relied on outcome post-selection, a procedure where only the measurement results corresponding to the desired state are considered. This method severely limits the usefulness of the resulting entangled states. Here, we show the direct production of polarization-entangled photon triplets by cascading two entangled downconversion processes. Detecting the triplets with high-efficiency superconducting nanowire single-photon detectors allows us to fully characterize them through quantum state tomography. We use our three-photon entangled state to demonstrate the ability to herald Bell states, a task that was not possible with previous three-photon states, and test local realism by violating the Mermin and Svetlichny inequalities. These results represent a significant breakthrough for entangled multi-photon state production by eliminating the constraints of outcome post-selection, providing a novel resource for optical quantum information processing. A three-photon entangled Greenberger–Horne–Zeilinger state is directly produced by cascading two entangled down-conversion processes. Experimentally, 11.1 triplets per minute are detected on average. The three-photon entangled state is used for state tomography and as a test of local realism by violating the Mermin and Svetlichny inequalities.
Subfields: Artificial Intelligence, Atomic and Molecular Physics, and Optics
View Paper: https://www.semanticscholar.org/paper/9dedd2aae3e66ffee74e3e6ee8e4f5aa1c2f5ea7
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In Artificial Intelligence
In Atomic and Molecular Physics, and Optics
Citations in the corpus
- Spontaneous parametric down-conversion (2018, methodology): “A direct 3-photon has also been shown using cascaded SPDC [48].”