Squeezed Vacuum State Routing and Quantum Decoherence Metrics in Ring-Resonator Optical Photonic Circuits

International Journal of Physics | Vol. 10, No. 8, August 2019 | pp. 57–64

DOI: 10.46882/2019/IJP/000112

Research Article

Title: Squeezed Vacuum State Routing and Quantum Decoherence Metrics in Ring-Resonator Optical Photonic Circuits

Names of Authors: A. M. Ross¹, L. K. Rousseau²

Authors’ Affiliations: ¹Department of Physics, University of Queensland, Brisbane, QLD 4072, Australia; ²Laboratoire de Physique des Plasmas, École Polytechnique, Palaiseau, France

Abstract: Routing non-classical states of light with high precision across integrated chips is a fundamental operational necessity for building distributed quantum computing arrays and cryptography nodes. This study models continuous-wave squeezed vacuum state routing and evaluates quantum decoherence metrics inside integrated ring-resonator optical photonic circuits. We solved the spatial quantum stochastic Schrödinger equations using an algebraic operator framework that accounts for localized evanescent coupling gaps, material scattering losses, and thermal phonon dephasing paths at 4.2 K. Squeezed vacuum states at 1550.0 nm were injected into the boundary port of a cascaded four-ring network. The calculations demonstrate that introducing a minor 2.0% fabrication asymmetry across the ring margins induces destructive phase shifts, dropping the squeezed noise limit from 8.2 dB down to 2.5 dB at the exit port. To protect state purity, we simulated an active phase-stabilization feedback loop that tracks the relative local oscillator phase parameters in real-time. The optimized circuit configuration restored the squeezing level to 7.0 dB, yielding a state fidelity calculation of 95.2% ± 0.3%. These findings assist in minimizing state degradation across complex quantum networks.

Keywords: Quantum optics; squeezed states; ring resonators; integrated photonics; quantum decoherence; phase stabilization

Manuscript Timeline: Received: April 15, 2019; Revised: June 02, 2019; Accepted: June 22, 2019; Published: August 14, 2019

Citation: Ross, A. M., & Rousseau, L. K. (2019). Squeezed Vacuum State Routing and Quantum Decoherence Metrics in Ring-Resonator Optical Photonic Circuits. International Journal of Physics, 10(8), 57–64.

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