Challenges
Datasets
Workspaces
Papers
Discussions
Leaderboard
Log inSign up
Challenges
Datasets
Workspaces
Papers
Discussions
Leaderboard
Blog
Job Board
Q3AS

© 2026 Aqora Quantum S.A.S.

TermsPrivacyLegal Notice

Frontiers in Optics

An elegant length tolerant design of waveguide arrays for the generation of N-partite two photon W state

Surajit Paul, Krishnan Thyagarajan

Published Jan 1, 2014• 0 citations
Publisher

Abstract

An elegant design of a waveguide array consisting of (2N-1) identical single mode optical waveguides is introduced to create ‘N’ partite two photon W state that illustrates much enhanced tolerance to the fabrication conditions and experimental perturbations.
DOI
10.1364/fio.2014.ftu2d.4

Related papers

Generation ofN-partite single and two photonWstates with enhanced tolerance using waveguide arrays

Surajit Paul, Krishnan Thyagarajan

Recently, integrated optic solutions for generating single photon N-partite W states by using a one-dimensional array of N identical single-mode optical waveguides, which are coupled via nearest-neighbour interaction, have been proposed. Due to the particular design of the proposed structure, the tolerances with respect to the length of the device and the input wavelength of the single photon for the generation of the W state are very critical, thus making an experimental realization troublesome. Here, we propose an alternative design of a waveguide array consisting of (2N-1) waveguides to create a single-photon N-partite W state that exhibits much greater tolerance to the fabrication conditions as well as to the input wavelength and hence is much more realizable experimentally. The same design is also shown to lead to the generation of two-photon W-states when using the post selection technique.

Journal of Optics•Sep 17, 2014•4 citations

Mimicking photon propagation through two-dimensional waveguide array by a one-dimensional waveguide array

Surajit Paul, Krishnan Thyagarajan

Photon propagation through 1D and 2D waveguide arrays has been explored for various applications in the fields of quantum optics and quantum information. In this paper, we show that an appropriately designed 1D waveguide array can mimic the photon propagation through a 2D array. This alternative design is enticing since fabrication of 1D arrays is relatively less burdensome than 2D arrays.

Journal of the Optical Society of America A•May 1, 2015•0 citations

Single Photon Quantum Walk in Waveguide Arrays with Next-nearest Neighbor Interaction

Surajit Paul, Krishnan Thyagarajan

We show how the next nearest neighbor interaction modifies the photon propagation characteristics in 1-D waveguide arrays and how this enables us to realize a 5 partite W state in an array of 5 equally spaced waveguides.

Frontiers in Optics•Jan 1, 2015•0 citations

Functional photonics with a resonantly absorbing waveguide array

Yikun Liu, Mingneng Feng, Yongyao Li +3 more

A waveguide array consisting of resonantly absorbing molecules is designed, fabricated and characterized. Spatial, spectroscopic and temporal control of light field is demonstrated with the novel structure.

•Aug 1, 2011•0 citations

Propagation of few-photon states in waveguide arrays

Nadia Belabas, Ch. Minot, Izo I. Abram +2 more

We quantitatively explore the ability of coupled waveguide arrays to characterize and manipulate two-photon and NOON states. We emphasize in particular the potential of patterned arrays in which the coupling is structured.

Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC)•May 1, 2013•0 citations

W-state generation and verification in linearly coupled waveguide arrays

Kolja Bugarski, Aleksandra Maluckov, Jovana S. Petrovic

Abstract W states are maximally entangled states with excellent robustness to loss. They have been studied in ion, photon and waveguide-mode bases, however the entanglement verification has remained challenging. Here, we theoretically study W-state generation by the quantum walk of a single photon through a linearly coupled waveguide array (WGA) that supports self-imaging of light. We design W states in symmetric and asymmetric arrays with even and odd number of waveguides. Bipartite entanglement is formally proven using the von Neumann entropy of the reduced density matrix. We further use the self-imaging to construct an entanglement witness based on the exclusion principle. A key to verification is the interferometer which extends the length of a W-state generator to the revival length where the photon is fully recombined into a single waveguide mode. In addition, W-state coherence is proven by numerically demonstrating the far-field interference. The sensitivities of the proposed W-state generation and verification protocols to the fabrication tolerances are numerically evaluated in glass, silicon nitride and silicon-on-insulator WGAs, indicating the feasibility of their realisation by high-precision e-beam lithography and laser writing.

Journal of Physics B Atomic Molecular and Optical Physics•Dec 3, 2024•0 citations
Recently, integrated optic solutions for generating single photon N-partite W states by using a one-dimensional array of N identical single-mode optical waveguides, which are coupled via nearest-neighbour interaction, have been proposed. Due to the particular design of the proposed structure, the tolerances with respect to the length of the device and the input wavelength of the single photon for the generation of the W state are very critical, thus making an experimental realization troublesome. Here, we propose an alternative design of a waveguide array consisting of (2N-1) waveguides to create a single-photon N-partite W state that exhibits much greater tolerance to the fabrication conditions as well as to the input wavelength and hence is much more realizable experimentally. The same design is also shown to lead to the generation of two-photon W-states when using the post selection technique.
Abstract W states are maximally entangled states with excellent robustness to loss. They have been studied in ion, photon and waveguide-mode bases, however the entanglement verification has remained challenging. Here, we theoretically study W-state generation by the quantum walk of a single photon through a linearly coupled waveguide array (WGA) that supports self-imaging of light. We design W states in symmetric and asymmetric arrays with even and odd number of waveguides. Bipartite entanglement is formally proven using the von Neumann entropy of the reduced density matrix. We further use the self-imaging to construct an entanglement witness based on the exclusion principle. A key to verification is the interferometer which extends the length of a W-state generator to the revival length where the photon is fully recombined into a single waveguide mode. In addition, W-state coherence is proven by numerically demonstrating the far-field interference. The sensitivities of the proposed W-state generation and verification protocols to the fabrication tolerances are numerically evaluated in glass, silicon nitride and silicon-on-insulator WGAs, indicating the feasibility of their realisation by high-precision e-beam lithography and laser writing.