Exploring complex graphs using three-dimensional quantum walks of correlated photons

Quantum walks of correlated particles

Quantum walks of correlated particles offer the possibility to study large-scale quantum interference, simulate biological, chemical and physical systems, and a route to universal quantum computation. Here we demonstrate quantum walks of two identical photons in an array of 21 continuously evanescently-coupled waveguides in a SiOxNy chip. We observe quantum correlations, violating a classical limit by 76 standard deviations, and find that they depend critically on the input state of the quantum walk. These results open the way to a powerful approach to quantum walks using correlated particles …

Two-Dimensional Quantum Walk of Correlated Photons

Quantum walks in an elaborately designed graph, is a powerful tool simulating physical and topological phenomena, constructing analog quantum algorithms and realizing universal quantum computing. Integrated photonics technology has emerged as a versatile platform to implement various quantum information tasks and a promising candidate to perform large-scale quantum walks. Both extending physical dimensions and involving more particles will increase the complexity of the evolving systems and the desired quantum resources. Pioneer works have demonstrated single particle walking on two-dimensiona…

非厄米光子晶格中关联光子的量子行走

Quantum walks of correlated photons in non-Hermitian photonic lattices

针对非厄米系统纠缠实验探究的难题，该研究提出并实现了非厄米光子晶格中双关联光子的量子行走，观测到体区域单向行走及趋肤效应致纠缠抑制，助力开放多体量子纠缠研究。

基于超快时间仓编码的光子量子行走

Photonic quantum walk with ultrafast time-bin encoding

本文提出基于超快时间仓编码的光子量子行走平台，在皮秒尺度编码实现18步量子行走，50小时内无需主动稳相即可保持干涉相位稳定，整体保真度超过95%，兼具可扩展性与可编程性。

Statistics-dependent quantum co-walking of two particles in one-dimensional lattices with nearest-neighbor interactions

We investigate continuous-time quantum walks of two indistinguishable particles [bosons, fermions or hard-core bosons (HCBs)] in one-dimensional lattices with nearest-neighbor interactions. The results for two HCBs are well consistent with the recent experimental observation of two-magnon dynamics [Nature 502, 76 (2013)]. The two interacting particles can undergo independent- and/or co-walking depending on both quantum statistics and interaction strength. Two strongly interacting particles may form a bound state and then co-walk like a single composite particle with statistics-dependent walk s…