A paper Dr S. Rahimi-Keshari has been highlighted in PRX
 It is widely believed that quantum computers will be able to perform certain tasks faster than any classical computer. Identifying the resource that enables this speedup is of great interest in quantum information science. This work investigates the circumstances under which generic quantum-optics experiments can be simulated efficiently using only classical resources.

The PRX paper begins by formulating two sufficient conditions for the efficient classical simulation of quantum-optics experiments using quantum light in an optical network. These conditions provide useful practical tools for investigating the effects of imperfectly implementing quantum-optical protocols such as boson sampling. The goal of this work is to determine whether sampling from the output probability distribution can be efficiently simulated using only classical resources. Using the theory of phase-space quasiprobability distributions, it is shown that the negativity of these distributions is a necessary resource for experiments not to be efficiently classically simulatable. Considering several sources of error, the authors show that above some threshold for loss and noise, boson-sampling experiments are classically simulatable. This analysis identifies mode mismatching-imperfect overlap of optical signals on optical elements-as the chief challenge for implementations of boson-sampling experiments of interesting size.

Finding and results of this paper is expected to pave the way for future studies of quantum light in optical networks.
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