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Idealized Einstein-Podolsky-Rosen states from non–phase-matched parametric down-conversion

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Okoth,  Cameron
Chekhova Research Group, Research Groups, Max Planck Institute for the Science of Light, Max Planck Society;
International Max Planck Research School, Max Planck Institute for the Science of Light, Max Planck Society;

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Cavanna,  Andrea
Chekhova Research Group, Research Groups, Max Planck Institute for the Science of Light, Max Planck Society;
University of Erlangen-Nürnberg;

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Chekhova,  Maria
University of Erlangen-Nürnberg;
Department of Physics, M. V. Lomonosov Moscow State University;
Chekhova Research Group, Research Groups, Max Planck Institute for the Science of Light, Max Planck Society;

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Citation

Okoth, C., Kovlakov, E., Bönsel, F., Cavanna, A., Straupe, S., Kulik, S. P., et al. (2020). Idealized Einstein-Podolsky-Rosen states from non–phase-matched parametric down-conversion. Physical Review A, 101: 011801(R). doi:10.1103/PhysRevA.101.011801.


Cite as: https://hdl.handle.net/21.11116/0000-0005-0FAA-C
Abstract
The most common source of entangled photons is spontaneous parametric down-conversion (SPDC). The degree of energy and momentum entanglement in SPDC is determined by the nonlinear interaction volume. By reducing the length of a highly nonlinear material, we relax the longitudinal phase-matching condition and reach record levels of transverse momentum entanglement. The degree of entanglement is estimated using both correlation measurements and stimulated emission tomography in wave-vector space. The high entanglement of the state in wave-vector space can be used to massively increase the quantum information capacity of photons, but more interestingly the equivalent state measured in position space is correlated over distances far less than the photon wavelength. This property promises to improve the resolution of many quantum imaging techniques beyond the current state of the art.