Topologically Protected Strong Coupling and Entanglement Between Distant Quantum Emitters

Abstract

The realization of robust strong coupling and entanglement between distant quantum emitters (QEs) is very important for scalable quantum information processes. However, it is hard to achieve it based on conventional systems. Here, we propose theoretically and demonstrate numerically a scheme to realize such strong coupling and entanglement. Our scheme is based on the photonic crystal platform with topologically protected edge state and zero-dimensional topological corner cavities. When the QEs are put into topological cavities, the strong coupling between them can be fulfilled with the assistance of the topologically protected interface state. Such a strong coupling can maintain a very long distance and be robust against various defects. Especially, we numerically prove that the topologically protected entanglement between two QEs can also be realized. Moreover, the duration of quantum beats for such entanglement can reach several orders longer than that for the entanglement in a conventional photonic cavity, making it be very beneficial for a scalable quantum information process.

3D Printed Polymer Photonic Topological Insulators and their Robustness to Fabrication Disorder

“…To investigate the impact of disorder at the corners, we investigated all possible geometries in which the 6 rods at each corner can occupy either their position in the trivial lattice or their position in the topological lattice. Thus, there are 2 12 = 4096 possible corner configurations in this large but discrete parameter sweep. We simulated the transmission through all 4096 possible structures using a commercial high-speed FDTD solver [46] (Tidy3D) with a total simulation time of 14.8 hours (13 seconds per simulation).…”

“…Photonic topological insulators (TIs), periodic structures with a band gap in the bulk but gapless dispersion at the edges, possess the unique ability to guide light around defects and sharp turns without scattering. [1][2][3][4] Such topological protection of light propagation provides an exciting new platform for on-chip low-threshold lasing, [5][6][7][8][9] robust long-range quantum information and energy transfer, [10][11][12] unidirectional emission from spin-polarized quantum states, [13] low-dimensional confinement, [14,15] robust optical resonators and delay lines, [16,17] soliton generation, [18,19] hybrid light-matter states, [20,21] generation of twisted light, and quantum networks. [10,22,23] Photonic TIs were first demonstrated at microwave frequencies by breaking time-reversal symmetry in a lattice of gyromagnetic rods, producing the photonic analogue of the quantum Hall effect [24] which produces a single unidirectional chiral edge state.…”

Optically induced topological spin-valley Hall effect for exciton polaritons

“…However, when a propagating signal experiences a bend in its path, a significant amount gets reflected. Topological insulators, which are commonly characterized by gapped bulk modes and robust edge modes within the bulk band gap [2], are often thought of as the potential candidate for transferring signals [3][4][5][6][7][8].…”

Rapid Design, Fabrication, and Optimization of 3D Printed Photonic Topological Insulators

“…Photonic topological insulators (TIs), periodic structures with a band gap in the bulk but gapless dispersion at the edges, possess the unique ability to guide light around defects and sharp turns without scattering. [1][2][3] Such topological protection of light propagation provides an exciting new platform for on-chip low-threshold lasing, [4][5][6] robust long-range quantum information and energy transfer, [7][8][9] unidirectional emission from spin-polarized quantum states, [10] robust optical resonators and delay lines, [11,12] soliton generation, [13,14] and quantum networks. [7,15,16] Photonic TIs were first demonstrated at microwave frequencies by breaking time-reversal symmetry in a lattice of gyromagnetic rods, producing the photonic analogue of the quantum Hall effect [17] which produces a single unidirectional chiral edge state.…”