携带轨道angular momentum的光子量子比特通过大气turbulence时量子度的普适衰减
Universal decay of quantumness for photonic qubits carrying orbital angular momentum through atmospheric turbulence
摘要：
研究了在Kolmogorov湍流大气中，两个光子量子比特在其轨道角动量上部分纠缠时的量子度衰减特性，包括量子纠缠、量子不协调和量子相干性.研究发现，当两个光子的初始态不是最大纠缠时，量子相干性和量子不和谐的衰减可能与量子纠缠的衰减有质的不同。我们还分别导出了量子相干性和量子不和谐的两个普适衰减律，并证明了量子相干性的衰减比非经典关联的衰减更稳健。
英文摘要：
We investigate the decay properties of the quantumness including quantum entanglement, quantum discord and quantum coherence for two photonic qubits, which are partially entangled in their orbital angular momenta, through Kolmogorov turbulent atmosphere. It is found that the decay of quantum coherence and quantum discord may be qualitatively different from that of quantum entanglement when the initial state of two photons is not maximally entangled. We also derive two universal decay laws for quantum coherence and quantum discord, respectively, and show that the decay of quantum coherence is more robust than nonclassical correlations.
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