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Journal Article

Microscale Generation of Entangled Photons without Momentum Conservation

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/persons/resource/persons221040

Okoth,  Cameron
Quantum Radiation, Leuchs Division, Max Planck Institute for the Science of Light, Max Planck Society;
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;

/persons/resource/persons201030

Cavanna,  Andrea
Quantum Radiation, Leuchs Division, Max Planck Institute for the Science of Light, Max Planck Society;
Chekhova Research Group, Research Groups, Max Planck Institute for the Science of Light, Max Planck Society;

/persons/resource/persons231249

Santiago-Cruz,  Tomas
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;

/persons/resource/persons201034

Chekhova,  Maria
Chekhova Research Group, Research Groups, Max Planck Institute for the Science of Light, Max Planck Society;

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arXiv:1902.11218.pdf
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Citation

Okoth, C., Cavanna, A., Santiago-Cruz, T., & Chekhova, M. (2019). Microscale Generation of Entangled Photons without Momentum Conservation. Physical Review Letters, 123(26): 263602. doi:10.1103/PhysRevLett.123.263602.


Cite as: https://hdl.handle.net/21.11116/0000-0003-279A-4
Abstract
We report, for the first time, the observation of spontaneous parametric down-conversion (SPDC) free of phase matching (momentum conservation).We alleviate the need to conserve momentum by exploiting the
position-momentum uncertainty relation and using a planar geometry source, a 6 μm thick layer of lithium niobate. Nonphase-matched SPDC opens up a new platform on which to investigate fundamental quantum
effects but it also has practical applications. The ultrasmall thickness leads to a frequency spectrum an order of magnitude broader than that of phase-matched SPDC. The strong two-photon correlations are still
preserved due to energy conservation. This results in ultrashort temporal correlation widths and huge frequency entanglement. The studies we make here can be considered as the initial steps into the emerging field of nonlinear quantum optics on the microscale and nanoscale.