Squeezed Vacuum State Transport and Decoupling Metrics in Periodic Optical Waveguide Networks

International Journal of Physics | Vol. 5, No. 6, June 2014 | pp. 41–48

DOI: 10.46882/2014/IJP/000050

Research Article

Title: Squeezed Vacuum State Transport and Decoupling Metrics in Periodic Optical Waveguide Networks

Names of Authors: A. M. Ross¹, F. Z. Al-Mansoori²

Authors’ Affiliations: ¹Department of Physics, University of Queensland, Brisbane, QLD 4072, Australia; ²Department of Physics, Faculty of Science, United Arab Emirates University, Al Ain, United Arab Emirates

Abstract: Processing non-classical states of light within integrated photonic architectures is essential for scalable quantum communication and computation networks. This study analyzes the transport properties and evaluates decoupling metrics of continuous-wave squeezed vacuum states propagating through a periodic array of coupled optical waveguides. We solved the spatial quantum stochastic Schrödinger equations using an algebraic operator framework that accounts for localized evanescent coupling and intrinsic propagation losses. Squeezed vacuum states at 1550.0 nm were injected into the central waveguide channel of a lithium niobate array. The calculations show that spatial discrete diffraction spreads quantum correlations across adjacent channels, which reduces the squeezing level in the primary channel from 6.0 dB to 1.8 dB over a 20.0 mm propagation path. To counteract this loss of squeezing, we simulated an array configuration with a linearly chirped coupling profile. This design establishes a quantum Bloch oscillation regime that successfully restores the squeezing level to 5.2 dB at the output facet. This restoration achieves a state fidelity calculation of 94.2% ± 0.4%. These results provide practical strategies for routing and protecting non-classical light within complex quantum photonic integrated circuits.

Keywords: Quantum optics; squeezed states; optical waveguides; discrete diffraction; Bloch oscillations; integrated photonics

Manuscript Timeline: Received: March 04, 2014; Revised: April 22, 2014; Accepted: May 12, 2014; Published: June 19, 2014

Citation: Ross, A. M., & Al-Mansoori, F. Z. (2014). Squeezed Vacuum State Transport and Decoupling Metrics in Periodic Optical Waveguide Networks. International Journal of Physics, 5(6), 41–48.

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