A rigorous definition of nonlinear parameter γ and effective area A_eff for photonic crystal optical waveguides

We present a theoretical proposal for an integrated four-wave mixing source of narrow-band path-entangled photon pairs with efficient spatial pump self-rejection. The scheme is based on correlated loss in a system of waveguides in Kerr nonlinear media. We calculate that this setup gives the possibility for upwards of 100 dB pump rejection, without additional filtering. The effect is reached by driving the symmetric collective mode that is strongly attenuated by an engineered dissipation, while photon pairs are born in the antisymmetric mode. A similar set-up can additionally be realized for the generation of two-photon NOON states, also with pump self-rejection. We discuss the implementation of the scheme by means of the coherent diffusive photonics, and demostrate its feasibility in both glass (such as fused silica-glass and IG2) and planar semiconductor waveguide structures in indium phosphide (InP) and in silicon.

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“…With a single-mode silicon waveguides, one can have much tighter mode localization (for example,

at 1550 nm wavelength [ 39 ]), and much higher non-linearity. For example, for such a silicon waveguide with a large

at the wavelength of 1550 nm, just few

W input power suffice for reaching the 1 KHz generation rate [ 40 ].…”

Section: Resultsmentioning

confidence: 99%

Integrated Source of Path-Entangled Photon Pairs with Efficient Pump Self-Rejection

et al. 2020

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“…Assuming n = 2.6, λ 0 = 1550 nm, l = 6 µm, χ (2) = 32.8 pm/V, then r = 1.43 pm/V and L π V π 36.9 V • cm; this performance can be improved by a factor 2 by implementing an amplitude modulator based on a Mach-Zehnder interferometer driven by pads in the ground-signal-ground configuration, reducing V π L π down to 18.4 V • cm. This value is about one order of magnitude higher than the one of state of the art electro-optic modulators based on Lithium Niobate [45] (r 33 30.8 pm/V [27]) which use similar spacing between the pads [46]. As for other platforms, it is conceivable to improve the performance of electro-optic modulators using resonant structures like microring resonators [47].…”

Section: Electro-optic Modulatorsmentioning

confidence: 99%

“…Since in our case the field changes along the propagation, we average the nonlinear waveguide parameter along a single periodic cell, following the approach described in ref. [33]:…”

Section: Arm Length (V) 2000mentioning

confidence: 99%

Silicon carbide photonic platform based on suspended subwavelength waveguides

et al. 2020

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Silicon Carbide (SiC) displays a unique combination of optical and spin-related properties that make it interesting for photonics and quantum technologies. However, guiding light by total internal reflection can be difficult to achieve, especially when SiC is grown as thin films on higher index substrates, like silicon. Fabricating suspended subwavelength waveguides requires a single lithography step and offers a solution to the confinement problem, while preserving the design flexibility required for a scalable and complete photonic platform. Here we present a design for such platform, which can be used for both classical and quantum optics operation. We simulate basic optical components and analyze how to exploit the high nonlinearities of SiC and its defects.

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“…Si-nanowire waveguides have typically very high nonlinearity and loss, and small lengths. We assume loss of 5 dB/cm and moderate nonlinearity,γ NL = 300W −1 m −1 with other parameters being the same as above [32]. Notice that even for such loss level, Γ is larger than γ 1 , where γ 1 ≈ 115 m −1 .…”

Section: Silicon Nanowiresmentioning

confidence: 99%

Coherent Diffusive Photon Gun for Generating Nonclassical States

et al. 2019

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We suggest and discuss a concept of deterministic integrated sources of non-classical light based on the coherent diffusive photonics, a coherent light flow in a system of dissipatively coupled waveguides. We show how this practical quantum device can be realized with a system of single-mode waveguides laser-inscribed in nonlinear glass. We describe a hierarchy of models, from the complete multi-mode model of the waveguide network to the single mode coupled to a bath, analyze the conditions for validity of the simplest single-mode model and demonstrate feasibility of the generation of bright sub-Poissonian light states merely from a coherent input. Notably, the generation of non-classical states occurs at the initial stages of the dynamics, and can be accounted for in the linear model that allows us to circumvent the prohibiting computational complexity of the exact full quantum representation.

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A rigorous definition of nonlinear parameter γ and effective area A_eff for photonic crystal optical waveguides

Cited by 12 publications

References 29 publications

Integrated Source of Path-Entangled Photon Pairs with Efficient Pump Self-Rejection

Integrated Source of Path-Entangled Photon Pairs with Efficient Pump Self-Rejection

Silicon carbide photonic platform based on suspended subwavelength waveguides

Coherent Diffusive Photon Gun for Generating Nonclassical States

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