Multiphoton interference in a single-spatial-mode quantum walk

Kate L. Fenwick, Jonathan Baker, Guillaume S. Thekkadath, Aaron Z. Goldberg, Khabat Heshami, Philip J. Bustard, Duncan England, Frédéric Bouchard, Benjamin Sussman
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Abstract

Multiphoton interference is crucial to many photonic quantum technologies. In particular, interference forms the basis of optical quantum information processing platforms and can lead to significant computational advantages. It is therefore interesting to study the interference arising from various states of light in large interferometric networks. Here, we implement a quantum walk in a highly stable, low-loss, multiport interferometer with up to 24 ultrafast time bins. This time-bin interferometer comprises a sequence of birefringent crystals which produce pulses separated by 4.3\,ps, all along a single optical axis. Ultrafast Kerr gating in an optical fiber is employed to time-demultiplex the output from the quantum walk. We measure one-, two-, and three-photon interference arising from various input state combinations, including a heralded single-photon state, a thermal state, and an attenuated coherent state at one or more input ports. Our results demonstrate that ultrafast time bins are a promising platform to observe large-scale multiphoton interference.
单空间模式量子行走中的多光子干扰
多光子干涉对许多光子量子技术至关重要。特别是,干涉是光量子信息处理平台的基础,可以带来显著的计算优势。因此,研究大型干涉网络中各种光状态产生的干涉很有意义。在这里,我们在一个高度稳定、低损耗、多端口、多达 24 个超快时间分段的干涉仪中实现了量子漫步。这种时间分区干涉仪由一串双折射晶体组成,它们沿着单一光轴产生相隔 4.3 ps 的脉冲。光纤中的超快克尔门控被用来对量子行走的输出进行时间倍增。我们测量了各种输入状态组合产生的单、双和三光子干涉,包括一个或多个输入端口的预示单光子状态、热状态和衰减相干状态。我们的研究结果表明,超快时间分段是观测大规模多光子干涉的理想平台。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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