Abstract
Quantum plasmonics presents a new insight into quantum photonic science and technology. The unique properties of surface plasmon polaritons (SPPs) provide immense potential for quantum control of light in ultracompact systems. The quantum behavior of SPPs should be described by corresponding SPP states, which have attracted a lot of investigative interest recently. In this work, we focus on the interaction of single quanta of SPPs. The generation of a squeezed SPP state through parametric down conversion (PDC) is investigated. Due to intrinsic loss of an SPP, this system deviates from those based on traditional bulk optics. Unlike the previous negative image, it is surprising to find that the role of loss is partly positive. As an illustration, the squeezing process of an SPP in a hybrid plasmonic waveguide system is calculated and shown. The degree of squeezing could reach above 7 dB with a propagation length of only about 12 μm in a single path. Moreover, the spectrum of squeezing has a band of 481.7 TH...
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