Photonics Research, 2018, 6 (4): 040000A6, Published Online: Jul. 10, 2018   

Photon-pair generation in a quadratically nonlinear parity-time symmetric coupler

Author Affiliations
1 Nonlinear Physics Centre, Research School of Physics and Engineering, Australian National University, Canberra, ACT 2601, Australia
2 School of Mathematical and Physical Sciences, University of Technology Sydney, Ultimo, NSW 2007, Australia
Abstract
Integrated nonlinear waveguide structures enable generation of quantum entangled photons. We describe theoretically the effects of spatially inhomogeneous loss on the creation of photon pairs through spontaneous parametric down-conversion in quadratically nonlinear directional couplers, where photons experience effective parity-time (PT) symmetric potential due to the presence of optical loss in one of the waveguides. We show that for losses below the PT-breaking threshold, the quantum photon states can be flexibly tuned similarly to conservative couplers, whereas for stronger losses, the correlations between two waveguide modes are suppressed. We also formulate a quantum-classical correspondence with sum-frequency generation for fast evaluation of device performance. These results can be applied for the design of quantum plasmonic circuits.

Diana A. Antonosyan, Alexander S. Solntsev, Andrey A. Sukhorukov. Photon-pair generation in a quadratically nonlinear parity-time symmetric coupler[J]. Photonics Research, 2018, 6(4): 040000A6.

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