Disorder in parity-time symmetric quantum walks

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We experimentally investigate the impact of static disorder and dynamic disorder on the non-unitary dynamics of parity-time (PT)-symmetric quantum walks.Via temporally alternating photon losses in an interferometric network,we realize the passive PT-symmetric quantum dynamics for single photons.Controllable coin operations allow us to simulate different environmental influences,which result in three different behaviors of quantum walkers:a standard ballistic spread,a diffusive behavior,and a localization,respectively,in a PT-symmetric quantum walk architecture.
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