Journal
PHYSICAL REVIEW X
Volume 4, Issue 3, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevX.4.031007
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Funding
- Discovery Projects [DP1093767, DP130100135]
- Future Fellowship [FT100100160]
- Laureate Fellowship [FL120100029]
- Centre of Excellence [CE110001018]
- Discovery Early Career Researcher Grants [DE130101148, DE120100226]
- Australian Research Council (ARC)
- European Commission [IST-2000-26005 (ROSA)]
- Thuringian Ministry of Education and Research (Project MeMa)
- Australian Research Council [DP1093767] Funding Source: Australian Research Council
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We demonstrate a nonlinear optical chip that generates photons with reconfigurable nonclassical spatial correlations. We employ a quadratic nonlinear waveguide array, where photon pairs are generated through spontaneous parametric down-conversion and simultaneously spread through quantum walks between the waveguides. Because of the quantum interference of these cascaded quantum walks, the emerging photons can become entangled over multiple waveguide positions. We experimentally observe highly nonclassical photon-pair correlations, confirming the high fidelity of on-chip quantum interference. Furthermore, we demonstrate biphoton-state tunability by spatial shaping and frequency tuning of the classical pump beam.
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