Quantized time in quantum walks under weak rank-K measurements

Measurements can be used to monitor the evolution of quantum systems and may lead to a universally quantized time statistics. It is known that the mean return time is quantized for strong and indirect monitoring through the winding number of the return amplitude in a one-dimensional space. Here we discuss that under multi-channel strong or indirect monitoring, where the latter is achieved through ancilla coupling, the mean return time of a quantum walk in the projected subspace is also quantized. This reflects a universal time quantization for a higher dimensional evolution.

Source: arXiv:2606.13552v1 - http://arxiv.org/abs/2606.13552v1 PDF: https://arxiv.org/pdf/2606.13552v1 Original Link: http://arxiv.org/abs/2606.13552v1