Two-photon quantum walks in an elliptical direct-write waveguide array
J. O. Owens, M. A. Broome, D. N. Biggerstaff, M. E. Goggin, A., Fedrizzi, T. Linjordet, M. Ams, G. D. Marshall, J. Twamley, M. J. Withford,, A. G. White

TL;DR
This paper demonstrates the use of an elliptical waveguide array in integrated optics to emulate quantum systems through two-photon quantum walks, highlighting differences based on photon indistinguishability and confirming the feasibility of 3D quantum emulation.
Contribution
It introduces a novel elliptical waveguide array for two-photon quantum walks and validates quantum emulation in 3D integrated photonic structures.
Findings
Distinct differences between indistinguishable and distinguishable two-photon inputs
Successful characterization of the photonic chip via coherent-light tomography
Feasibility of emulating quantum phenomena in 3D waveguide structures
Abstract
Integrated optics provides an ideal test bed for the emulation of quantum systems via continuous-time quantum walks. Here we study the evolution of two-photon states in an elliptic array of waveguides. We characterise the photonic chip via coherent-light tomography and use the results to predict distinct differences between temporally indistinguishable and distinguishable two-photon inputs which we then compare with experimental observations. Our work highlights the feasibility for emulation of coherent quantum phenomena in three-dimensional waveguide structures.
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