Observation of Asymmetric Transport in Structures with Active Nonlinearities

Abstract

A mechanism for asymmetric transport based on the interplay between the fundamental symmetries of parity (P) and time (T) with nonlinearity is presented. We experimentally demonstrate and theoretically analyze the phenomenon using a pair of coupled van der Pol oscillators, as a reference system, one with anharmonic gain and the other with complementary anharmonic loss; connected to two transmission lines. An increase of the gain/loss strength or the number of PT-symmetric nonlinear dimers in a chain, can increase both the asymmetry and transmittance intensities.

5 pages, 5 figures

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• Anti-Parity-Time Symmetric Optics via Flying Atoms
• Metrology with $\mathcal{P}\mathcal{T}$-symmetric cavities: Enhanced sensitivity near the $\mathcal{P}\mathcal{T}$-phase transition
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• A review of progress in the physics of open quantum systems: theory and experiment
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• Realization of nonlinear optical nonreciprocity on a few-photon level based on atoms strongly coupled to an asymmetric cavity
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• Experimental realization of Floquet PT-symmetric systems
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• Non-Hermitian Acoustic Metamaterials: the role of Exceptional Points in sound absorption
• Parity-Time Symmetry in Non-Hermitian Complex Optical Media
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• Nonreciprocal photon blockade in a two-mode cavity with a second-order nonlinearity
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• Parity-Time Anti-Symmetric Parametric Amplifier
• Experimental demonstration of Cavity-Free Optical Isolators and Optical Circulators
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• Experimental Demonstration of Controllable PT and anti-PT Coupling in a non-Hermitian Metamaterial
• Non-reciprocal transmission in photonic lattices based on unidirectional coherent perfect absorption
• A solvable model for solitons pinned to a PT-symmetric dipole
• Time-dependent $\mathcal{P}\mathcal{T}$-symmetric quantum mechanics in generic non-Hermitian systems
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• Symmetry-Protected Scattering in Non-Hermitian Linear Systems
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• CP symmetry in optical systems
• Experimentally-realizable $\mathcal{P}\mathcal{T}$ phase transitions in reflectionless quantum scattering
• Multisoliton Newton's cradles and supersolitons in regular and PT-symmetric nonlinear couplers
• Few-photon optical diode in a chiral waveguide
• Quasi-energies, parametric resonances, and stability limits in ac-driven $\mathcal{P}\mathcal{T}$-symmetric systems
• Stability and collisions of quantum droplets in PT -symmetric dual-core couplers
• Balanced gain and loss in Bose-Einstein condensates without PT symmetry
• Observation of exceptional point in a PT broken non-Hermitian system simulated using a quantum circuit
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• Physics of PT-Symmetric Quantum Systems at Finite Temperature
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• $\mathcal{P}\mathcal{T}-$Symmetric Dimers with Time-Periodic Gain/Loss Function
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