Alladi Ramakrishnan Hall

Information Processing with a class of non-Gaussian Quantum Optical States

Soumyakanti Bose

S. N. Bose National Centre for Basic Sciences

In recent years, non-Gaussian entangled states of light have gained immense importance in several information processing tasks such as quantum teleportation, dense coding, entanglement distillation etc. These states are typically obtained by de-Gaussification of two-mode squeezed vacuum state. In contrast to these non-linear processes, non-Gaussian entangled states could also be generated by using linear optical device like beam splitter (BS) from single
mode nonclassical states at input. However, the BS generated entangled states remain largely unexplored in the context of information processing. We analyse various information theoretic
aspects of BS output entangled states generated from a class of non-Gaussian input states that involve multiple non-classicality (NC)-inducing operations.

We show that the BS generated entanglement depends crucially on the mutual competition between the NC-inducing operations involved in the input states [1]. Since, the existing well-
known measures fail to quantify the effective NC of the input states reasonably, we propose a new measure of single mode quantum optical NC in terms of Wehrl entropy [2]. We notice that
our newly proposed measure efficiently quantifies the NC in the presence of competing NCs. We further study teleportation with these class of BS generated entangled states as resource. Our numerical results indicate that the resource states need to be necessarily two-mode quadrature squeezed to yield quantum teleportation [3].

References:
[1] Soumyakanti Bose and M. Sanjay Kumar, Phys. Rev. A 95, 0123303 (2017).

[2] Soumyakanti Bose, arXiv: 1700.00064 [v2] (2017).

[3] Soumyakanti Bose and M. Sanjay Kumar (in preparation).