@article{Bressanini:2024:10.1103/PhysRevA.109.013707,
author = {Bressanini, G and Kwon, H and Kim, MS},
doi = {10.1103/PhysRevA.109.013707},
journal = {Physical Review A: Atomic, Molecular and Optical Physics},
title = {Gaussian boson sampling at finite temperature},
url = {http://dx.doi.org/10.1103/PhysRevA.109.013707},
volume = {109},
year = {2024}
}

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TY  - JOUR
AB  - 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—modeled by (passive) linear optical interaction between the system and a Markovian thermal bath—has the effect of tightening the constraints on the remaining noise parameters, required to show quantum advantage. Furthermore, we show that there exists a threshold temperature, under the assumption of a uniform loss rate, at which quantum sampling experiments become classically simulable, and provide an intuitive physical interpretation by relating this occurrence with the disappearance of the quantum state's nonclassical properties.
AU  - Bressanini,G
AU  - Kwon,H
AU  - Kim,MS
DO  - 10.1103/PhysRevA.109.013707
PY  - 2024///
SN  - 1050-2947
TI  - Gaussian boson sampling at finite temperature
T2  - Physical Review A: Atomic, Molecular and Optical Physics
UR  - http://dx.doi.org/10.1103/PhysRevA.109.013707
UR  - https://journals.aps.org/pra/abstract/10.1103/PhysRevA.109.013707
UR  - http://hdl.handle.net/10044/1/113548
VL  - 109
ER  - 

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