Superiority of photon subtraction to addition for entanglement in a multimode squeezed vacuum

Tamoghna Das, R. Prabhu, Aditi Sen(De), and Ujjwal Sen
Phys. Rev. A 93, 052313 – Published 9 May 2016

Abstract

We investigate the entanglement patterns of photon-added and photon-subtracted four-mode squeezed vacuum states. Entanglements in different scenarios are analyzed by varying the number of photons added or subtracted in certain modes, which are referred to as the “player” modes, the others being “spectators.” We find that the photon-subtracted state can give us higher entanglement than the photon-added state which is in contrast to the two-mode situation. We also study the logarithmic negativity of the two-mode reduced density matrix obtained from the four-mode state which again shows that the state after photon subtraction can possess higher entanglement than that of the photon-added state, and we then compare it to that of the two-mode squeezed vacuum state. Moreover, we examine the non-Gaussianity of the photon-added and photon-subtracted states to find that the rich features provided by entanglement cannot be captured by the measure of nonclassicality.

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  • Received 4 September 2015

DOI:https://doi.org/10.1103/PhysRevA.93.052313

©2016 American Physical Society

Physics Subject Headings (PhySH)

Quantum Information, Science & Technology

Authors & Affiliations

Tamoghna Das1, R. Prabhu1,2, Aditi Sen(De)1, and Ujjwal Sen1

  • 1Harish-Chandra Research Institute, Chhatnag Road, Jhunsi, Allahabad 211 019, India
  • 2Department of Physics, Indian Institute of Technology Patna, Bihta 801103, Bihar, India

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Issue

Vol. 93, Iss. 5 — May 2016

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