Robustness of distributed nonclassicality against local Gaussian noise

Sagnik Garai and J. Solomon Ivan
Phys. Rev. A 100, 013842 – Published 22 July 2019

Abstract

We study the robustness of single-mode squeezing nonclassicality against the action of single-mode Gaussian noise (Gaussian channels), first in its local single-mode form and second in its nonlocal distributed form as two-mode entanglement, with the channel acting locally on the single-mode. We find that the distributed single-mode nonclassicality is more robust than local single-mode nonclassicality against the local application of the canonical single-mode Gaussian channels i.e., for the canonical attenuator channel, the canonical amplifier channel, the canonical phase-conjugation channel, and the channel with a singular X matrix, with the exception of the channel with a singular Y matrix. This robustness persists even when the canonical channel is nonclassicality breaking. For the canonical channel with a singular Y matrix, we find that the distributed as well as the local single-mode nonclassicality is equally robust against the local application of the channel. We illustrate examples where local single-mode squeezing is more robust than distributed squeezing against the local application of the channel, for channels not of the canonical form.

  • Figure
  • Received 16 May 2019

DOI:https://doi.org/10.1103/PhysRevA.100.013842

©2019 American Physical Society

Physics Subject Headings (PhySH)

Atomic, Molecular & Optical

Authors & Affiliations

Sagnik Garai* and J. Solomon Ivan

  • Department of Physics, Indian Institute of Space Science and Technology, Valiamala, Thiruvananthapuram 695 547, India

  • *sagnikgarai2013@gmail.com
  • solomonivan@iist.ac.in

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Vol. 100, Iss. 1 — July 2019

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