Isfahan University of Technology, The Physics Society of Iran Iranian Journal of Physics Research 1682-6957 21 4 2022 02 20 Simulation of thermal fragility of vacuum squeezing in two photon lossy cavity Simulation of thermal fragility of vacuum squeezing in two photon lossy cavity 663 675 1742 10.47176/ijpr.21.4.11190 FA M Sadeghi Department of Physics, University of Hormozgan, Bandar-e-Abbas, Iran 0000-0002-1971-9600 S Ahmadi Department of Physics, University of Hormozgan, Bandar-e-Abbas, Iran Journal Article 2021 01 18 In this research, squeezing fragility due to thermal bath, in quantum squeezed state generation, is simulated. For this purpose, single mode dissipative cavity with non-zero second-order susceptibility is used. Cavity nonlinear medium is driving by laser pump with known frequency, and pairs of identical photons are created, with one-half frequency of driving pump. This process known as degenerate parametric down conversion. In the absence of any dissipation, simulation shows linear time dependent squeezing parameter, which is in agreement with theoretical results. In two photon loss of cavity in contact with cold reservoir, competition between gain and two photon loss, results in stable squeezing of initial vacuum, in steady state of system. At the end, has been shown that, non-zero thermal reservoir, omits the squeezing and leads the final cavity field to the thermal mixture of Fock states. In this research, squeezing fragility due to thermal bath, in quantum squeezed state generation, is simulated. For this purpose, single mode dissipative cavity with non-zero second-order susceptibility is used. Cavity nonlinear medium is driving by laser pump with known frequency, and pairs of identical photons are created, with one-half frequency of driving pump. This process known as degenerate parametric down conversion. In the absence of any dissipation, simulation shows linear time dependent squeezing parameter, which is in agreement with theoretical results. In two photon loss of cavity in contact with cold reservoir, competition between gain and two photon loss, results in stable squeezing of initial vacuum, in steady state of system. At the end, has been shown that, non-zero thermal reservoir, omits the squeezing and leads the final cavity field to the thermal mixture of Fock states. simulation Squeezed vacuum Squeezing fragility Two-photon loss https://ijpr.iut.ac.ir/article_1742_39a2f59dc5db083189411e648c216812.pdf