4-dB quadrature squeezing with fiber-coupled PPLN ridge waveguide module

Abstract

We have developed an optical parametric amplification module for quadrature squeezing with input and output ports coupled with optical fibers for both fundamental and second harmonic. The module consists of a periodically poled LiNbO${}_3$ ridge waveguide fabricated with dry etching, dichroic beamsplitters, lenses and four optical fiber pigtales. The high durability of the waveguide and the good separation of squeezed light from a pump beam by the dichroic beamsplitter enable us to inject intense continuous-wave pump light with the power of over 300 mW. We perform $-$4.0$\pm$0.1 dB of noise reduction for a vacuum state at 1553.3 nm by using a fiber-optics-based measurement setup, which consists of a fiber-optic beamsplitter and a homemade fiber-receptacle balanced detector. The intrinsic loss of the squeezed vacuum in the module is estimated to be 25%. Excluding the extrinsic loss of the measuremental system, the squeezing level in the output fiber of the module is estimated to be $-$5.7$\pm$0.1 dB. A modularized alignment-free fiber-coupled quadrature squeezer could help to realize quantum information processing with fiber optics.

arXiv comment4 pages, 4 figures; detector changed to one with higher efficiency, measurement done again with the new detector, data updated, format changed, title changed

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Cited by in corpus (8)

• Fabrication of low-loss quasi-single-mode PPLN waveguide and its application to a modularized broadband high-level squeezer
• Building a large-scale quantum computer with continuous-variable optical technologies
• All-optical phase-sensitive detection for ultra-fast quantum computation
• Quantum state engineering in arrays of nonlinear waveguides
• Two-mode squeezing over deployed fiber coexisting with conventional communications
• All-optical measurement-device-free feedforward enabling ultra-fast quantum information processing
• Programmable time-multiplexed squeezed light source
• Compact Fiber-Coupled Narrowband Two-Mode Squeezed Light Source