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International Journal of Theoretical Physics

Survival of Entanglement in an Optical Parametric Oscillation from Decoherence

Desalegn Ayehu

Published Aug 28, 2021• 8 citations
Publisher
DOI
10.1007/s10773-021-04939-1

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Any quantum system, in interacting with the external classical environment, slowly loses its quantumness and entanglement degrades. In this paper, we experimentally found that, even in the presence of a strong decoherence, the state generated by a sub-threshold type-II optical parametric oscillator never disentangles, keeps breaking the quantum limit for the discord and, as a resource for quantum teleportation of a coherent state, would allow us, in principle, to realize quantum teleportation over an infinitely long Gaussian channel.
We study the exact decoherence dynamics of the entangled squeezed state of two single-mode optical fields interacting with two independent and uncorrelated environments. We analyze in detail the non-Markovian effects on the entanglement evolution of the initially entangled squeezed state for different environmental correlation time scales. We find that the environments have dual actions on the system: backaction and dissipation. In particular, when the environmental correlation time scale is comparable to the time scale for significant change in the system, the backaction would counteract the dissipative effect. Interestingly, this results in the survival of some residual entanglement in the final steady state.