Anderson localization of entangled photons in an integrated quantum walk
Anderson localization of entangled photons in an integrated quantum walk
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DOI：
10.1038/nphoton.2013.26
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发表时间：
2013-04-01
期刊：
影响因子：
35
通讯作者：
Mataloni, Paolo
中科院分区：
文献类型：
--
作者：
Crespi, Andrea;Osellame, Roberto;Mataloni, Paolo
Anderson定域化是一种普遍存在的效应，在经典系统中也观察到了，它是由在静态无序介质中传播的波的相消干涉引起的，最初是在存在无序势的量子粒子中预测的。在这里，我们报道了在离散量子行走中观察到的偏振纠缠光子对受位置相关无序影响的现象。通过利用光子的偏振纠缠来模拟不同的量子统计，实验研究了Anderson局域化机制与波函数的玻色子/费米子对称性之间的相互作用。无序晶格是由飞秒激光写入玻璃制成的干涉仪集成阵列实现的。一种新的技术被用来在网络的每个单元网格中引入受控相移。这种方法为量子模拟带来了巨大的潜力，并在“难以模拟”的情况下实现了超越经典计算机的计算能力。
First predicted for quantum particles in the presence of a disordered potential, Anderson localization is a ubiquitous effect, observed also in classical systems, arising from the destructive interference of waves propagating in static disordered media. Here we report the observation of this phenomenon for pairs of polarization-entangled photons in a discrete quantum walk affected by position-dependent disorder. By exploiting polarization entanglement of photons to simulate different quantum statistics, we experimentally investigate the interplay between the Anderson localization mechanism and the bosonic/fermionic symmetry of the wavefunction. The disordered lattice is realized by an integrated array of interferometers fabricated in glass by femtosecond laser writing. A novel technique is used to introduce a controlled phase shift into each unit mesh of the network. This approach yields great potential for quantum simulation and for implementing a computational power beyond the one of a classical computer in the 'hard-to-simulate' scenario.