Generation of three-mode continuous-variable entanglement by cascaded nonlinear interactions in a quasiperiodic superlattice

Abstract

The generation of three-mode continuous-variable entanglement in a quasiperiodically optical superlattice is studied theoretically in this paper. This work is based on the previous experiment result in which three-color light generated from a quasiperiodically optical superlattice through a stimulated parametric down-conversion cascaded with a sum-frequency process. The degree of quadrature phase amplitude correlations, a nonclassical characteristic, among the three mode was discussed by a sufficient inseparability criterion for continuousvariable entanglement, which was proposed by van Loock and Furusawa.

Quadripartite entanglement from coupled type I second harmonic generation

“…Two-color bipartite entanglement has been realized via parametric oscillation [3,4] or type I second harmonic generation (SHG) [5][6][7]. Multicolored tripartite entangled states from cascaded nonlinear processes have been investigated by several groups [8][9][10][11][12]. Simpler schemes, where tripartite entanglement exists in the three output fields directly from above threshold optical parametric oscillator (OPO) [13] or type II SHG [14,15], have been predicted and experimentally confirmed [16].…”

The influence of pump depletion on multipartite continuous-variable entanglement in a frequency non-degenerate parametric amplifier

“…The tripartite CV entanglement can be generated by mixing squeezed states with linear optical elements [12][13][14][15]. Loock and Furusawa [15] derived inequalities that are easily applicable to tripartite CV entangled states [16][17][18][19]. Genuine four-partite CV entanglement has been generated experimentally [10].…”

Three-mode entanglement via atomic coherence induced by strong classical field

“…Recently, with the development of multi-node quantum network technology, much attention has been paid on how to generate, detect and employ multipartite CV entanglement for quantum communication in various of linear optics and nonlinear optics systems [29][30][31][32][33][34][35][36][37][38][39][40][41][42]. For example, P. van Loock and Samuel L. Braunstein have investigated a truly multipartite entangled state generated by one single mode squeezed state distributed among N parties using linear optics [29].…”