热碱原子中通过光学参量放大产生的孪生光束中的隐藏纠缠
Hidden entanglement in twin beams generated through optical parametric amplification in hot alkali atoms
AI总结：
针对热铷蒸气四波混频孪生光束中常规光谱测量遗漏纠缠的问题，研究采用基于谐振器的测量揭示隐藏纠缠，并说明频率相关增益及载波-边带相移对纠缠见证的影响。
摘要：
对多模光学态中的量子关联进行恰当表征，对于量子信息科学中的应用至关重要；然而，最常见的纠缠测量可能导致不完整的态重构。场正交分量的普遍光谱测量就是这种情况，无法对光束之间的量子关联进行完整表征。我们在热铷蒸气中通过四波混频参量放大产生的孪生光束中展示了这一效应，揭示了频率相关增益响应的作用。我们实施了一种基于谐振器的测量，揭示了光束之间原本被常规光谱测量隐藏的纠缠。此外，该系统展示了相关场上载波与边带之间的相移如何影响不同纠缠见证者对纠缠的观测，证明了进行完整态层析的重要性。
英文摘要：
Proper characterization of quantum correlations in a multimode optical state is critical for applications in quantum information science; however, the most common entanglement measurements can lead to an incomplete state reconstruction. This is the case for the ubiquitous spectral measurement of field quadratures for which a full characterization of the quantum correlations between optical beams is not possible. We demonstrate this effect in twin beams generated through parametric amplification by four-wave mixing in hot rubidium vapor, showing the role of a frequency dependent gain response. We implement a resonator-based measurement that reveals entanglement between beams that is otherwise hidden by usual spectral measurements. Additionally, this system shows how the phase shifts between the carrier and the sidebands on the involved fields affect the observation of entanglement for different entanglement witnesses, demonstrating the relevance of making a complete state tomography.
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