Montaña Guerrero A, Rincón Celis R L, Nussenzveig P, Martinelli M, Marino A M, M Florez H
Instituto de Física, Universidade de São Paulo, 05315-970 São Paulo, SP, Brazil.
Center for Quantum Research and Technology and Homer L. Dodge Department of Physics and Astronomy, The University of Oklahoma, Norman, Oklahoma 73019, USA.
Phys Rev Lett. 2022 Oct 14;129(16):163601. doi: 10.1103/PhysRevLett.129.163601.
We present the measurement of entanglement between twin beams generated with a doubly resonant optical parameter oscillator (OPO) based on four-wave mixing in hot ^{85}Rb vapor above threshold. This is the first measurement of entanglement in an OPO with a χ^{(3)} media above threshold. We reconstruct the covariance matrix for several configurations and based on a full picture of the four side band mode state, we study entanglement between all possible bipartitions. We show a robust generation of entanglement with stronger generation for a specific pair of modes. For this system, we show that atomic density is a determinant factor for the generation and loss of quantum correlations. The generation of entangled fields with an atomic OPO operating close to atomic resonance of alkali atoms enables a natural integration into quantum networks.
我们展示了基于热^{85}Rb蒸汽中四波混频的双共振光学参量振荡器（OPO）产生的孪生光束之间纠缠的测量。这是首次对阈值以上具有χ^{(3)}介质的OPO中的纠缠进行测量。我们针对几种配置重建了协方差矩阵，并基于四个边带模式状态的全貌，研究了所有可能二分法之间的纠缠。我们展示了纠缠的稳健产生，对于特定的一对模式产生更强。对于该系统，我们表明原子密度是量子关联产生和损失的决定性因素。在接近碱金属原子共振的情况下运行的原子OPO产生纠缠场，能够自然地集成到量子网络中。
