研究目的
Developing an optical parametric amplification module for quadrature squeezing with input and output ports coupled with optical fibers for both fundamental and second harmonic.
研究成果
The developed fiber-coupled single-pass OPA module demonstrated a squeezing level of ?4.0±0.1 dB, with the original squeezing level at the output port estimated to be ?5.7±0.1 dB excluding the detection loss. This modularized alignment-free fiber-coupled squeezer could play an important role in implementing quantum information processing with light.
研究不足
The intrinsic loss of the squeezed vacuum in the module is estimated to be 25%, which could be improved by modifying the dry etching method or performing wet etching after dry etching.
1：Experimental Design and Method Selection:
The module consists of a periodically poled LiNbO3 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 the injection of intense continuous-wave pump light.
2：Sample Selection and Data Sources:
A vacuum state at
3：3 nm is used for noise reduction measurement. List of Experimental Equipment and Materials:
15 The module includes a PPLN ridge waveguide, dichroic beamsplitters, lenses, and optical fiber pigtales. The measurement setup consists of a fiber-optic beamsplitter and a homemade fiber-receptacle balanced detector.
4：Experimental Procedures and Operational Workflow:
The module is used to perform noise reduction for a vacuum state, with the squeezing level measured using the fiber-optics-based setup.
5：Data Analysis Methods:
The intrinsic loss of the squeezed vacuum in the module is estimated, and the squeezing level is calculated excluding the extrinsic loss of the measurement system.
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3 dB coupler
PN1550R5F2
Thorlabs
Interference of the squeezed vacuum with the LO
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Phase modulator
LN53-10-P-S-S-BNL
Thorlabs
Scanning of the phase of the LO
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AR coated fibers
P1-1550PMAR-2
Thorlabs
Connection to a homemade fiber-receptacle InGaAs balanced photodetector
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Lenses
TC25FC-1550 and LA1134-C
Thorlabs
Part of a homemade fiber-receptacle InGaAs balanced photodetector
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Mirrors
TFVM-25.4C05-1550
Sigma Koki
Part of a homemade fiber-receptacle InGaAs balanced photodetector
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Operational amplifier
AD829
Analog devices
Part of a homemade fiber-receptacle InGaAs balanced photodetector
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Spectrum analyzer
N9010A
Keysight
Measurement of the signal from the detector
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Bandpass filter
TFF-15-1-PM-L-100-SS-SA
Alnair Labs
Reduction of noise due to amplified spontaneous emission from the fiber amplifier
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Polarizing beamsplitter
PBS-5-7800
Sigma Koki
Part of a custom-made fiber-pigtaled variable optical attenuator
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Variable attenuator
VOA50PM-FC
Thorlabs
Attenuation of the less intense output of the beamsplitter
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ORION module
RIO-OptaSense Inc.
Source of continuous-wave laser light at 1553.3 nm
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Erbium-doped fiber amplifier
CEDA-C-PB-HP
Keopsys
Amplification of the output of the seed laser
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Frequency doubler
WH-0776-000-F-B-C
NTT Electronics
Generation of frequency doubled beam
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Half-wave plate
WPZ1210
Casix
Part of a custom-made fiber-pigtaled variable optical attenuator
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Photodiodes
IGHQEX0100-1550-10-1.0-SPAR-TH-40
Laser Components
Part of a homemade fiber-receptacle InGaAs balanced photodetector
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