Challenges
Datasets
Workspaces
Papers
Discussions
Leaderboard
Log inSign up
Challenges
Datasets
Workspaces
Papers
Discussions
Leaderboard
Blog
Job Board
Q3AS

© 2026 Aqora Quantum S.A.S.

TermsPrivacyLegal Notice

Indian Journal of Physics

Improving entanglement and inhabiting depolarization of two-mode entangled coherent-squeezed states

Alireza Dehghani

Published Sep 2, 2023• 0 citations
Publisher
DOI
10.1007/s12648-023-02889-4

Related papers

Entangled nonlinear coherent-squeezed states: inhibition of depolarization and disentanglement

Alireza Dehghani, B. Mojaveri, A. A. Alenabi

Applied Physics B•Jan 19, 2022•5 citations

Two-mode photon-added entangled coherent-squeezed states: their entanglement and nonclassical properties

Amir Karimi

Applied Physics B•May 31, 2017•19 citations

Displacement-enhanced continuous-variable entanglement concentration

Ondřej Černotík, Jaromı́r Fiurášek

We study entanglement concentration of continuous-variable Gaussian states by local photon subtractions enhanced by coherent displacements. Instead of the previously considered symmetric two-mode squeezed vacuum states, we investigate the protocol for input states in the form of split single-mode squeezed vacuum (i.e., states obtained by mixing a single-mode squeezed vacuum with a vacuum state on a beam splitter), which is an experimentally highly relevant configuration. We analyze two scenarios in which the displacement-enhanced photon subtraction is performed either only on one or on both of the modes and show that local displacements can lead to improved performance of the concentration protocol.

arXiv:1212.0974•Physical Review A•Nov 30, 2012•13 citations

Generation of entangled coherent-squeezed states: their entanglement and nonclassical properties

Amir Karimi, Mohammad Kazem Tavassoly

Quantum Information Processing•Jan 9, 2016•25 citations

Enhancing quantum entanglement for continuous variables by a coherent superposition of photon subtraction and addition

Su‐Yong Lee, Se-Wan Ji, Ho-Joon Kim +1 more

We investigate how the entanglement properties of a two-mode state can be improved by performing a coherent superposition operation $t\mathrm{a\ifmmode \hat{}\else \^{}\fi{}}+r{\mathrm{a\ifmmode \hat{}\else \^{}\fi{}}}^{\ifmmode\dagger\else\textdagger\fi{}}$ of photon subtraction and addition, proposed by Lee and Nha [Phys. Rev. A 82, 053812 (2010)], on each mode. We show that the degree of entanglement, the Einstein-Podolsky-Rosen--type correlation, and the performance of quantum teleportation can be all enhanced for the output state when the coherent operation is applied to a two-mode squeezed state. The effects of the coherent operation are more prominent than those of the mere photon subtraction $\mathrm{a\ifmmode \hat{}\else \^{}\fi{}}$ and the addition ${\mathrm{a\ifmmode \hat{}\else \^{}\fi{}}}^{\ifmmode\dagger\else\textdagger\fi{}}$ particularly in the small-squeezing regime, whereas the optimal operation becomes the photon subtraction (case of $r=0$) in the large-squeezing regime.

arXiv:1107.2771•Physical Review A•Jul 5, 2011•159 citations

Optimizing the fidelity of continuous-variable quantum teleportation

Yun‐Jie Xia

Based on the fidelity conclusions of employing two-mode squeezed vacuum state for the entangled channel to teleport coherent state, continuous-variable quantum teleportation employing bright two-mode squeezed state for the entangled channel was studied. The results indicate that it's fidelity can be further improved by choosing appropriate parameters, in addition, we can fulfill that fidelity is 1, that is, not anamorphic quantum teleportation of coherent state under particular conditions.

Chinese Journal of Quantum Electronics•Jan 1, 2004•0 citations
We study entanglement concentration of continuous-variable Gaussian states by local photon subtractions enhanced by coherent displacements. Instead of the previously considered symmetric two-mode squeezed vacuum states, we investigate the protocol for input states in the form of split single-mode squeezed vacuum (i.e., states obtained by mixing a single-mode squeezed vacuum with a vacuum state on a beam splitter), which is an experimentally highly relevant configuration. We analyze two scenarios in which the displacement-enhanced photon subtraction is performed either only on one or on both of the modes and show that local displacements can lead to improved performance of the concentration protocol.
We investigate how the entanglement properties of a two-mode state can be improved by performing a coherent superposition operation $t\mathrm{a\ifmmode \hat{}\else \^{}\fi{}}+r{\mathrm{a\ifmmode \hat{}\else \^{}\fi{}}}^{\ifmmode\dagger\else\textdagger\fi{}}$ of photon subtraction and addition, proposed by Lee and Nha [Phys. Rev. A 82, 053812 (2010)], on each mode. We show that the degree of entanglement, the Einstein-Podolsky-Rosen--type correlation, and the performance of quantum teleportation can be all enhanced for the output state when the coherent operation is applied to a two-mode squeezed state. The effects of the coherent operation are more prominent than those of the mere photon subtraction $\mathrm{a\ifmmode \hat{}\else \^{}\fi{}}$ and the addition ${\mathrm{a\ifmmode \hat{}\else \^{}\fi{}}}^{\ifmmode\dagger\else\textdagger\fi{}}$ particularly in the small-squeezing regime, whereas the optimal operation becomes the photon subtraction (case of r=0r=0r=0) in the large-squeezing regime.