量子纠缠
物理
压扁的纠缠
分束器
多体纠缠
量子力学
佯谬
量子计量学
不对称
W州
量子
统计物理学
量子不和谐
激光器
作者
K. Wagner,Jiří Janoušek,Seiji Armstrong,Jean-François Morizur,Ping Koy Lam,Hans‐A. Bachor
标识
DOI:10.1088/0953-4075/47/22/225502
摘要
Continuous variable entanglement can be produced in nonlinear systems or via the interference of squeezed states. In many optical systems such as parametric down conversion, the production of two perfectly symmetric subsystems is usually assumed when demonstrating the existence of entanglement. This symmetry simplifies the description of entanglement. However, asymmetry in entanglement may arise naturally in a real experiment, or be intentionally introduced in a given quantum information protocol. These asymmetries can emerge from having the output beams experience different losses and environmental contamination, or from the availability of non-identical input quantum states in quantum communication protocols. In this paper, we present a visualization of entanglement using quadrature amplitude plots of the twin beams. We quantitatively discuss the strength of asymmetric entanglement using EPR and inseparability criteria and theoretically show that the optimal beamsplitter ratio for entanglement is dependent on the asymmetries and may not be 50 : 50. To support this theory, we present experimental results showing one particular asymmetric entanglement where a 78 : 22 beamsplitter is optimal for observing entanglement.
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