Quadripartite continuous-variable entanglement generation by nondegenerate optical parametric amplification cascaded with a sum-frequency process

Abstract

Quadripartite continuous-variable (CV) entanglement with different optical frequencies can be generated by nondegenerate optical parametric amplification cascaded with a sum-frequency process in only one optical superlattice. Firstly, the idler beam is generated by a different frequency process between pump and signal beams. Then, the sum-frequency beam will be generated by a cascaded sum-frequency process between pump and idler beams in the same optical superlattice. The conversion dynamics of the cascaded nonlinear processes is investigated by using a quantum stochastic method. The quantum correlations among pump, signal, idler and sum-frequency beams are calculated by applying a sufficient inseparability criteria for quadripartite CV entanglement. The results show that quadripartite CV entangled beams can be produced by this single-pass cascaded nonlinear process in one optical superlattice.

Genuine quadripartite quantum steering generated by an optical parametric oscillation cascaded with a sum-frequency process

“…In ref. [38], we investigated the generation of quadripartite entanglement by optical parametric amplification cascaded a sum-frequency process. However, we did not include an optical cavity (it is a single-pass process) in the previous study and did not investigate the generation of multipartite quantum steering in the cascaded nonlinear process.…”

Implementation of bright six-partite entanglement by coupled intracavity sum frequency generation

“…Multipartite CV entanglement fields with different frequencies are more useful in connecting different physical systems at the nodes of quant um networks in contrast to those with the same frequency generated by beam splitters [7,8]. Many papers have reported the schemes which can generate two-color or multi-color CV entangled beams by an optical parametric down-conversion process [9][10][11][12][13], frequency up-conversion process [14][15][16][17] and cascaded or concurrent nonlinear processes [18][19][20][21][22][23][24][25][26][27][28][29].…”

Five-partite continuous-variable entanglement generated by cascaded nonlinear processes in only one optical superlattice

“…Quadripartite entangled beams can be generated by intracavity down-conversion cascaded two sum-frequency processes [35]. Another scheme proposed that the injected signal nondegenerate optical parametric amplification cascaded with a sum-frequency process can generate a quadripartite entangled state [36]. In this scheme, the sum-frequency beam is generated by the sum-frequency process of pump and idle.…”