Gaussian boson sampling at finite temperature
- URL: http://arxiv.org/abs/2308.13291v2
- Date: Tue, 23 Jan 2024 18:20:09 GMT
- Title: Gaussian boson sampling at finite temperature
- Authors: Gabriele Bressanini, Hyukjoon Kwon and M.S. Kim
- Abstract summary: We investigate how thermal noise affects the classical intractability of generic quantum optical sampling experiments.
We show that there exist a threshold temperature at which any quantum sampling experiment becomes classically simulable.
- Score: 4.437382576172235
- License: http://creativecommons.org/licenses/by/4.0/
- Abstract: Gaussian boson sampling (GBS) is a promising candidate for an experimental
demonstration of quantum advantage using photons. However, sufficiently large
noise might hinder a GBS implementation from entering the regime where quantum
speedup is achievable. Here, we investigate how thermal noise affects the
classical intractability of generic quantum optical sampling experiments, GBS
being a particular instance of the latter. We do so by establishing sufficient
conditions for an efficient simulation to be feasible, expressed in the form of
inequalities between the relevant parameters that characterize the system and
its imperfections. We demonstrate that the addition of thermal noise has the
effect of tightening the constraints on the remaining noise parameters,
required to show quantum advantage. Furthermore, we show that there exist a
threshold temperature at which any quantum sampling experiment becomes
classically simulable, and provide an intuitive physical interpretation by
relating this occurrence with the disappearance of the quantum state's
non-classical properties.
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