TY - JOUR A1 - Setzpfandt, Frank A1 - Sohler, Wolfgang A1 - Schiek, Roland A1 - Pertsch, Thomas T1 - Nonlinear coupling in discrete optical waveguide arrays with quadratic nonlinearity JF - Physical Review A N2 - We demonstrate nonlinear coupling in a discrete optical system. This is achieved in waveguide arrays with quadratic nonlinearity, where the symmetries of the nonlinearly interacting waveguide modes are used to suppress the usually dominating nonlinear effects within individual waveguides. We derive a mathematical model to describe the nonlinear coupling in such waveguide arrays and show experimentally the profound effects of this nonlinear coupling mechanism on second-harmonic generation. KW - BLOCH OSCILLATIONS KW - DYNAMICS KW - LIQUID-CRYSTALS KW - PHOTONIC LATTICES KW - PROPAGATION KW - SOLITONS Y1 - 2015 U6 - https://doi.org/10.1103/PhysRevA.92.043832 VL - 92 IS - 4 PB - American Physical Society ER - TY - JOUR A1 - Setzpfandt, Frank A1 - Solntsev, Alexander S. A1 - Titchener, James A1 - Wu, Che Wen A1 - Xiong, Chunle A1 - Schiek, Roland A1 - Pertsch, Thomas A1 - Neshev, Dragomir N. A1 - Sukhorukov, Andrey A. T1 - Tunable generation of entangled photons in a nonlinear directional coupler JF - Laser & Photonics Reviews N2 - The on-chip integration of quantum light sources has enabled the realization of complex quantum photonic circuits. However, for the practical implementation of such circuits in quantum information applications, it is crucial to develop sources delivering entangled quantum photon states with on-demand tunability. Here we propose and experimentally demonstrate the concept of a widely tunable quantum light source based on spontaneous parametric down-conversion in a simple nonlinear directional coupler. We show that spatial photon-pair correlations and entanglement can be reconfigured on-demand by tuning the phase difference between the pump beams and the phase mismatch inside the structure. We experimentally demonstrate the generation of split states, robust N00N states, various intermediate regimes and biphoton steering on a single chip. Furthermore we theoretically investigate other regimes allowing all-optically tunable generation of all Bell states and flexible control of path-energy entanglement. Such wide-range capabilities of a structure comprised of just two coupled nonlinear waveguides are attributed to the intricate interplay between linear coupling and nonlinear phase matching. This scheme provides an important advance towards the realization of reconfigurable quantum circuitry. KW - ARRAYS KW - directional coupler KW - entanglement KW - GATES KW - nonlinearity KW - PAIR GENERATION KW - photon pairs KW - WAVE KW - waveguides Y1 - 2016 U6 - https://doi.org/10.1002/lpor.201500216 VL - 10 IS - 1 SP - 131 EP - 136 PB - WILEY-VCH ER - TY - CHAP A1 - Schiek, Roland A1 - Setzpfandt, Frank A1 - Pertsch, Thomas A1 - Baronio, Fabio A1 - de Angelis, Costantino T1 - Spatial Rogue Waves in Quadratic Optical Slab Waveguides T2 - Advanced Photonics 2018 (BGPP, IPR, NP, NOMA, Sensors, Networks, SPPCom, SOF), OSA Techncail Digest (online) (Optica Publishing Group, 2018), paper NpTh1H.7 N2 - Spatial optical breather solutions of the Nonlinear Schrödinger Equation have been observed for the first time. The experiment was performed in an optical slab waveguide with the cascaded quadratic nonlinearity in second-harmonic generation. Y1 - 2018 SN - 978-1-943580-43-9 U6 - https://doi.org/10.1364/np.2018.npth1h.7 PB - OSA CY - Washington D.C. ER - TY - CHAP A1 - Setzpfandt, Frank A1 - Solntsev, Alexander S. A1 - Titchener, James A1 - Wu, Che W. A1 - Xiong, Chunle A1 - Pertsch, Thomas A1 - Schiek, Roland A1 - Neshev, Dragomir N. A1 - Sukhorukov, Andrey A. T1 - Optically tunable entangled photon state generation in a nonlinear directional coupler T2 - CLEO: QELS_Fundamental Science 2015, San Jose, California, United States, 10-15 May 2015 N2 - We propose and experimentally demonstrate an all-optically tunable biphoton quantum light source using a nonlinear directional coupler. The source can generate high-fidelity N00N states, completely split states, and states with variable degrees of entanglement. Y1 - 2015 SN - 978-1-55752-968-8 U6 - https://doi.org/10.1364/cleo_qels.2015.fth4d.3 PB - OSA CY - Washington, D.C. ER - TY - CHAP A1 - Setzpfandt, Frank A1 - Solntsev, Alexander S. A1 - Titchener, James A1 - Wu, Che Wen A1 - Xiong, Chunle A1 - Pertsch, Thomas A1 - Schiek, Roland A1 - Neshev, Dragomir N. A1 - Sukhorukov, Andrey A. T1 - Optically Tunable Entangled Photon State Generation in a Nonlinear Directional Coupler T2 - Nonlinear Optics [Kauai, Hawaii 26-31 July 2015] N2 - We propose and experimentally demonstrate an all-optically tunable biphoton quantum light source using a nonlinear directional coupler. The source can generate high-fidelity N00N states, completely split states, and states with variable degrees of entanglement. Y1 - 2015 SN - 978-1-55752-001-2 U6 - https://doi.org/10.1364/nlo.2015.nw2a.4 IS - paper NW2A.4 PB - OSA CY - Washington, D.C. ER - TY - CHAP A1 - Setzpfandt, Frank A1 - Schiek, Roland A1 - Sohler, Wolfgang A1 - Pertsch, Thomas T1 - Nonlinear Nearest-Neighbor Coupling in Quadratic Waveguide Arrays T2 - Nonlinear Optics : Proceedings Nonlinear Optics 26-31 July 2015, Kauai, Hawaii, United States N2 - We investigate nonlinear coupling between neighboring waveguides in waveguide arrays with second-order nonlinearity. Using mode symmetries to suppress local nonlinearities, we experimentally show the profound effect of such nonlinear nearest-neighbor interactions on second-harmonic generation. Y1 - 2015 SN - 978-1-55752-001-2 U6 - https://doi.org/10.1364/nlo.2015.nm3b.6 PB - OSA CY - Washington, D.C. ER - TY - CHAP A1 - Schiek, Roland A1 - Setzpfandt, Frank A1 - Baronio, Fabio T1 - Akhmediev Breathers and Modulation Instability’s Growth-Decay Cycle in Slab Waveguides T2 - Nonlinear Optics : 15-19 July 2019, Waikoloa Beach, Hawaii, United States N2 - Optical film waveguides served as new platform for investigating Akhmediev Breathers. Using the interplay between third-order and cascaded second-order optical nonlinearities breathers and modulation instability cycles in a wide nonlinear regime were characterized. Y1 - 2019 SN - 978-1-943580-62-0 U6 - https://doi.org/10.1364/nlo.2019.ntu2a.2 PB - OSA CY - Washington, D.C. ER -