Squeezing a Surface Plasmon through Quadratic Nonlinear Interactions

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 THz. It is a valuable advantage to keep a high squeezing degree in such a wide band, which is hard to realize in bulk systems. In addition, the tolerance of the system to loss is also shown to be good. The plasmonic system exhibits an attractive advantage in constructing integrated quantum circuits.

Photonic Entanglement Based on Nonlinear Metamaterials

“…Several methods are usually utilized to deal with absorption in quantum systems, such as the Liouvillian formulation, [ 30 ] the Green function, [ 17,31 ] and the equivalent beam splitter model. [ 32–34 ] According to the geometric character of the stacking system, it is relatively convenient to take advantage of the third method together with a differential approach in which the entire interaction medium is divided into a series of differential elements along the longitudinal direction. A 2D slice naturally plays as a dz ‐element.…”

Nanoscale nonlinear plasmonics in photonic waveguides and circuits

“…Such realistic studies suggested relatively high efficiency of 70%, and even presented novel enhancement mechanisms due to the anisotropic eigenmode topology of metal/dielectric multilayers. New toolkits for dealing with nonlinear quantum processes in lossy media are continuously being developed [270,271]. Experiments that rely on nonlinear plasmonics processes to generate quantum states are rare: guiding entangeld multi-photon states through the lossy media too easily destroys them.…”

“…[268]. Copyright (2015) National Academy of Sciences been made [273]; stronger nonlinearities, lower losses, and hybrid waveguide designs [271], could potentially overcome current limitations.…”

Water Cladded Plasmonic Slot Waveguide Vertically Coupled With Si3N4 Photonics

“…Various in-plane plasmonic waveguides have been co-integrated so far with silicon [8]- [28] or silica-on-silicon photonics [29], targeting either mature classical or promising quantum sensing systems [30], [31]. Specifically, Metal-Insulator-Metal (MIM) or plasmonic slot-based waveguides have attracted significant research interest due to their ability to support deep sub-wavelength confined SPP modes as opposed to stripe based SPP waveguides with decreased mode confinement [29].…”