Squeezed Vacuum State Propagation and Optomechanical Quantum Transduction in Photonic Crystal Cavities

International Journal of Physics | Vol. 12, No. 7, July 2021 | pp. 49–56

DOI: 10.46882/2021/IJP/000135

Research Article

Title: Squeezed Vacuum State Propagation and Optomechanical Quantum Transduction in Photonic Crystal Cavities

Names of Authors: A. M. Ross¹, M. G. Richter²

Authors’ Affiliations:
¹ Department of Physics, University of Queensland, Brisbane, QLD 4072, Australia
² Max-Planck-Institut für Festkörperforschung, Stuttgart, Germany

Abstract: High-fidelity optical-to-microwave conversion of non-classical light states is a primary requirement for building distributed quantum networks and linking distant superconducting quantum computers. This paper models continuous-wave squeezed vacuum state propagation and characterises optomechanical transduction dynamics within a silicon photonic crystal defect cavity. We solved the quantum stochastic Heisenberg-Langevin equations using an algebraic operator framework that accounts for localized optomechanical coupling paths, cavity mirror leaks, and thermal phonon dephasing at 4.2 K. Squeezed vacuum states at 1550.0 nm were injected into the boundary waveguide channel of a co-localized acoustic resonator network. The calculations demonstrate that introducing a minor 3.0% fabrication asymmetry across the mirror hole segments shifts the local cavity resonance, dropping the input squeezing level from 8.5 dB down to 2.2 dB due to destructive interference. To shelter the non-classical light from decay channels, we simulated an active phase-modulation feedback sequence that creates a synthetic gauge field to lock the relative phase parameters of the local oscillator. The optimized cavity layout successfully restored the squeezing level to 6.8 dB at the output port, yielding a target state fidelity calculation of 94.8% ± 0.3%.

Keywords: Quantum optics; squeezed states; photonic crystals; optomechanics; quantum transduction; integrated photonics

Manuscript Timeline: Received: March 11, 2021; Revised: May 19, 2021; Accepted: June 11, 2021; Published: July 12, 2021

Citation: Ross, A. M., & Richter, M. G. (2021). Squeezed Vacuum State Propagation and Optomechanical Quantum Transduction in Photonic Crystal Cavities. International Journal of Physics, 12(7), 49–56

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