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Applied Physics Letters

Experimental characterization of pairwise correlations from quadruple quantum correlated beams generated by cascaded four-wave mixing processes

Leiming Cao, Wei Wang, Yanbo Lou, Jinjian Du, Jietai Jing

Published Jun 18, 2018• 14 citations
Publisher

Abstract

We theoretically calculate and experimentally investigate the performance of the pairwise correlations from quadruple quantum correlated beams based on the cascaded four-wave mixing (FWM) processes. The experimental results have similar trends to their theoretical predictions. By properly changing the intensity gains of the cascaded FWM processes, we can gradually convert some pairs of classical correlated beams into quantum correlated beams. Our results may find potential applications in the manipulation of quantum correlated beams generated from the cascaded FWM processes.

DOI
10.1063/1.5039919

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We theoretically calculate and experimentally investigate the performance of the pairwise correlations from quadruple quantum correlated beams based on the cascaded four-wave mixing (FWM) processes. The experimental results have similar trends to their theoretical predictions. By properly changing the intensity gains of the cascaded FWM processes, we can gradually convert some pairs of classical correlated beams into quantum correlated beams. Our results may find potential applications in the manipulation of quantum correlated beams generated from the cascaded FWM processes.
We theoretically and experimentally characterize the performance of the pairwise correlations from triple quantum correlated beams based on the cascaded four-wave mixing (FWM) processes. The pairwise correlations between any two of the beams are theoretically calculated and experimentally measured. The experimental and theoretical results are in good agreement. We find that two of the three pairwise correlations can be in the quantum regime. The other pairwise correlation is always in the classical regime. In addition, we also measure the triple-beam correlation which is always in the quantum regime. Such unbalanced and controllable pairwise correlation structures may be taken as advantages in practical quantum communications, for example, hierarchical quantum secret sharing. Our results also open the way for the classification and application of quantum states generated from the cascaded FWM processes.
We theoretically characterize the performance of the pairwise correlations (PCs) from multiple quantum correlated beams based on the cascaded four-wave mixing (FWM) processes. The presence of the PCs with quantum corre- lation in these systems can be verified by calculating the degree of intensity difference squeezing for any pair of all the output fields. The quantum correlation characteristics of all the PCs under different cascaded schemes are also discussed in detail and the repulsion effect between PCs in these cascaded FWM processes is theoretically predicted. Our results open the way for the classification and application of quantum states generated from the cascaded FWM processes.
We experimentally explore the relationships between the number of multiple quantum correlated beams generated by two-beam pumped cascaded four-wave mixing (CFWM) process and the system parameters, such as the angle between the two pump beams, one-photon detuning and two-photon detuning. We find that all of three system parameters can influence the number of multiple quantum correlated beams. Under the optimal system parameters, we can observe the emission of up to 14 quantum correlated beams with the intensity-difference squeezing of -6.29 ± 0.20 dB (-7.93 ± 0.64 dB after accounting for losses) from such CFWM scheme. Our results may find potential applications in building multi-user quantum network and multi-parameter quantum metrology.
Quantum correlations and entanglement shared among multiple modes are fundamental ingredients of most continuous-variable quantum technologies. Recently, a method used to generate multiple quantum correlated beams using cascaded four-wave mixing (FWM) processes was theoretically proposed and experimentally realized by our group [Z. Qin et al., Phys. Rev. Lett. 113, 023602 (2014)]. Our study of triple-beam quantum correlation paves the way to showing the tripartite entanglement in our system. Our system also promises to find applications in quantum information and precision measurement such as the controlled quantum communications, the generation of multiple quantum correlated images, and the realization of a multiport nonlinear interferometer. For its applications, the degree of quantum correlation is a crucial figure of merit. In this letter, we experimentally study how various parameters, such as the cell temperatures, one-photon, and two-photon detunings, influence the degree of quantum correlation between the triple beams generated from the cascaded two-FWM configuration.