Three-dimensional entanglement on a silicon chip

Abstract

Entanglement is a counterintuitive feature of quantum physics that is at the heart of quantum technology. High-dimensional quantum states offer unique advantages in various quantum information tasks. Integrated photonic chips have recently emerged as a leading platform for the generation, manipulation and detection of entangled photons. Here, we report a silicon photonic chip that uses interferometric resonance-enhanced photon-pair sources, spectral demultiplexers and high-dimensional reconfigurable circuitries to generate, manipulate and analyse path-entangled three-dimensional qutrit states. By minimizing on-chip electrical and thermal cross-talk, we obtain high-quality quantum interference with visibilities above 96.5% and a maximally entangled-qutrit state with a fidelity of 95.5%. We further explore the fundamental properties of entangled qutrits to test quantum nonlocality and contextuality, and to implement quantum simulations of graphs and high-precision optical phase measurements. Our work paves the path for the development of multiphoton high-dimensional quantum technologies.

Advances in Silicon Quantum Photonics

“…In this technique, the pump resonance linewidth is broadended (lowering the associated quality factor) with respect to the signal and idler resonances. Recently this scheme was experimentally investigated, with purities of up to 0.95 and a heralding efficiency of 52% [196], and subsequently implemented on a silicon device generating and manipulating entanglement of two photonic qutrits [203]. Another approach is to use a split-pulse scheme manipulate the light dynamics inside the ring [197].…”

Quantum experiments and hypergraphs: Multiphoton sources for quantum interference, quantum computation, and quantum entanglement

“…Recent advances in integrated optics and silicon photonics have caused increasing attention to entanglement generation on chips [47,48]. Many chip-based source such as heralded single-photon sources [49,50] high-dimensional states [51,52], multiphoton states [53][54][55] and on-chip transverse-mode entangled photon pair source [56] have been successfully demonstrated. Those platforms are ideal for the practical implementation of our approach.…”

Silicon-based photonic quantum information technologies

“…精确制备、操作与测量. 基于马赫-泽德干涉仪-微环 谐振腔耦合型光源的3×3高维量子纠缠态制备、操作 与测量也已实现 [14] , 且该光源可实现高亮度的双光子 对产生 [15] . 芯片上多光子态的制备是实现可扩展量子 芯片的重要前提.…”