Generation of a Low-frequency Squeezed States at Telecommunication Wavelength

Li-ting, 要立婷 Yao; Jinxia, 冯晋霞 Feng; Ying-hao, 高英豪 Gao; Kuanshou, 张宽收 Zhang

doi:10.3788/jqo20172302.0001

Cited by 2 publications

(1 citation statement)

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“…A semi-monolithic OPO cavity has an external piezo-driven coupling mirror that can be used to impose the feedback control signal. This is a more popular scheme [19,24,25,35,36], and it has been applied to squeezed states' generation with a high-level squeezing factor [19]. The error signal for OPO locking can be extracted from the pump field in the case of a double-resonant cavity [36].…”

Section: Introductionmentioning

confidence: 99%

Utilizing Sequential Control Scheme to Stabilize Squeezed Vacuum States

et al. 2019

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We report on a sequential control scheme to realize a steady, quasi-continuous output of squeezed vacuum states, which eliminates the influence of the seed beam on the squeezing strength. The scheme, originating from time-division multiplexing, separates the generation process from the locking process. We confirm that the sequential control scheme does not reduce the squeezing strength and that the setup operates stably for a 3-h running test, with a duty ratio of 80% and cycle time of 5 s. Therefore, the sequential control scheme opens up a new path of manipulating squeezed vacuum states.

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Section: Introductionmentioning

confidence: 99%

Utilizing Sequential Control Scheme to Stabilize Squeezed Vacuum States

et al. 2019

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Generation of audio-band frequency squeezed light at 1.34 μm

冯晋霞¹,

杜京师²,

靳晓丽³

et al. 2018

Acta Phys. Sin.

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Continuous variable (CV) audio-band frequency squeezed states at the fiber telecommunication wavelength is an important quantum resource for the practical applications based on optical fiber. As is well known, the optical power attenuation and phase diffusion effect of light at 1.3 μm in standard telecommunication fibres are low and small, respectively. The audio-band frequency squeezed light at 1.34 μm can be utilized to realize quantum precision measurement, such as quantum-enhanced sensing in the low-frequency range, laser interferometer for gravitational wave detection. In this paper, CV audio-band frequency vacuum squeezed states at 1.3 μm are experimentally generated by using a type-I degenerate optical parametric oscillator (DOPO) below the threshold. A home-made continuous-wave single-frequency dual-wavelength (671 nm and 1.34 μm) Nd:YVO4/LBO laser is used as a pump source for DOPO based on a type-I quasi-phase-matched periodically poled KTiOPO4 (PPKTP) crystal. Mode cleaners with a finesse of 400 and linewidth of 0.75 MHz are used to filter the noise of lasers at 671 nm and 1.34 μm, respectively. The intensity noises of the two lasers reach a shot noise level for analysis frequencies higher than 1.0 MHz and their phase noises reach shot noise level for analysis frequencies higher than 1.3 MHz, respectively. The low noise single-frequency 671 nm laser is utilized as a pump of the DOPO. The threshold power of the DOPO is 450 mW. In order to detect the audio-band frequency vacuum squeezed states, the power of local oscillator of a homodyne detector system is optimized to 60 μupW. Furthermore, the effect of common mode rejection ratio (CMRR) of detectors is discussed in detecting the audio-band frequency vacuum squeezed states. Improvement of CMRR of detectors is a good way to detect the audio-band frequency vacuum squeezed states effectively. When the phase matching temperature of PPKTP crystal is controlled at 53℃ by using a home-made temperature controller and the pump power is 95 mW, the vacuum squeezed states are generated at analysis frequency ranging from 8-100 kHz. A maximum measured squeeze of 5.0 dB is obtained at analysis frequency of 36 kHz. A 3.0 dB squeezed light is obtained at an audio-band frequency of 8 kHz.

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Generation of a Low-frequency Squeezed States at Telecommunication Wavelength

Cited by 2 publications

References 0 publications

Utilizing Sequential Control Scheme to Stabilize Squeezed Vacuum States

Utilizing Sequential Control Scheme to Stabilize Squeezed Vacuum States

Generation of audio-band frequency squeezed light at 1.34 μm

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