Temporal trapping of ultrashort pulses enables deterministic optical quantum computation
Temporal trapping of ultrashort pulses enables deterministic optical quantum computation
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DOI：
10.1364/optica.473276
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发表时间：
2022-03
期刊：
影响因子：
10.4
通讯作者：
Ryotatsu Yanagimoto;Edwin Ng;M. Jankowski;H. Mabuchi;R. Hamerly
中科院分区：
文献类型：
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作者：
Ryotatsu Yanagimoto;Edwin Ng;M. Jankowski;H. Mabuchi;R. Hamerly
确定性光子-光子门的实现是光量子计算和工程的核心目标。一个长期存在的挑战是，由于现有光子结构中的关键损耗限制权衡，可扩展的室温材料平台中的光学非线性太弱，无法实现所需的强耦合。在这项工作中，我们介绍了一种新的限制方法，色散工程的时间捕获，以规避权衡，铺平了道路，全光强耦合。时间限制由辅助陷阱脉冲通过交叉相位调制施加，其与波导的空间限制相结合，产生“飞行腔“，其将非线性相互作用强度增强至少一个数量级。数值模拟证实，时间捕获限制多模非线性动力学的单模子空间，使高保真确定性量子门操作。通过实际的色散工程和损耗数据，我们证明了时间俘获的超短脉冲可以在短期非线性纳米光子平台上实现强耦合。我们的研究结果突出了超快非线性光学成为第一个可扩展的，高带宽的，室温平台，实现强耦合的潜力，为量子计算，模拟和光源开辟了一条新的道路。
The realization of deterministic photon-photon gates is a central goal in optical quantum computation and engineering. A longstanding challenge is that optical nonlinearities in scalable, room-temperature material platforms are too weak to achieve the required strong coupling, due to the critical loss-confinement tradeoff in existing photonic structures. In this work, we introduce a novel confinement method, dispersion-engineered temporal trapping, to circumvent the tradeoff, paving a route to all-optical strong coupling. Temporal confinement is imposed by an auxiliary trap pulse via cross-phase modulation, which, combined with the spatial confinement of a waveguide, creates a"flying cavity"that enhances the nonlinear interaction strength by at least an order of magnitude. Numerical simulations confirm that temporal trapping confines the multimode nonlinear dynamics to a single-mode subspace, enabling high-fidelity deterministic quantum gate operations. With realistic dispersion engineering and loss figures, we show that temporally trapped ultrashort pulses could achieve strong coupling on near-term nonlinear nanophotonic platforms. Our results highlight the potential of ultrafast nonlinear optics to become the first scalable, high-bandwidth, and room-temperature platform that achieves a strong coupling, opening a new path to quantum computing, simulation, and light sources.