Detection and perfect fitting of 132  dB squeezed vacuum states by considering green-light-induced infrared absorption

Shi, Shengli; Wang, Yajun; Yang, Wenhai; Zheng, Yaohui; Peng, Kunchi

doi:10.1364/ol.43.005411

Cited by 48 publications

(18 citation statements)

References 39 publications

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“…Typically, in this experiment, second harmonic of 397.5-nm with the power of 380 mW can be generated under the premise that the power of 795-nm fundamental frequency is 1 W. For OPO, the crystal is periodically poled Potassium titanyl phosphate crystal (PPKTP) (1 mm×2 mm×15 mm) with matching method of phase matching type-0 (e-e+e) and large nonlinear coefficient of d ef f = 7 ∼ 9 pm/V. However, the transmittance range of wavelength for PPKTP is from ∼ 350 nm to ∼ 4400 nm, which leads to a particularly severe heat absorption from 397.5nm UV-pumped laser and large loss of the internal cavity, so the squeezing level of 795-nm PSS is severely limited compared with 1064-nm [22].…”

Section: Preparation Of 795-nm Pss Of Lightmentioning

confidence: 99%

Enhancement of spin noise spectroscopy of rubidium atomic ensemble by using of the polarization squeezed light

Bai,

Zhang,

Yang

et al. 2021

Preprint

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We measured the spin noise spectroscopy (SNS) of rubidium atomic ensemble with two different atomic vapor cells (filled with the buffer gases or coated with paraffin film on the inner wall), and demonstrated the enhancement of signal-to-noise ratio (SNR) by using of the polarization squeezed state (PSS) of 795-nm light field with Stokes operator Λ S 2 squeezed. PSS is prepared by locking the relative phase between the squeezed vacuum state of light obtained by a sub-threshold optical parametric oscillator and the orthogonal polarized local oscillator beam by means of the quantum noise lock. Under the same conditions, PSS can be employed not only to improve SNR, but also to keep the full width at half maximum (FWHM) of SNS unchanged, compared with the case of using polarization coherent state (PCS), and the enhancement of SNR is positively correlated with the squeezing level of PSS. With the increase of probe laser's power and atomic number density, the SNR and FWHM of SNS will increase correspondingly. With the help of PSS of Stokes operator Λ S 2 , quantum enhancement of both SNR and FWHM of SNS signal has been demonstrated by controlling optical power of the Λ S 2 polarization squeezed light beam or atomic number density in our experiments.

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Section: Preparation Of 795-nm Pss Of Lightmentioning

confidence: 99%

Enhancement of spin noise spectroscopy of rubidium atomic ensemble by using of the polarization squeezed light

Bai,

Zhang,

Yang

et al. 2021

Preprint

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“…On one hand, quantum states have been significantly squeezed by up to 15 dB (that is, a reduction of 97% of the vacuum noise) using a nonlinear crystal embedded in an optical cavity [22][23][24][25][26][27], but the associated experimental setups have very large footprints and are not easily * tobias.gehring@fysik.dtu.dk transportable due to the need for multiple mode-cleaning cavities for the pump and local oscillator to maximize the squeezing and cavity based second harmonic generation to supply the pump which easily exceeds 100 mW. Due to this immobility, the squeezed light sources are often built up around the application.…”

Section: Introductionmentioning

confidence: 99%

Compact, low-threshold squeezed light source

Arnbak¹,

Jacobsen²,

Andrade³

et al. 2019

Opt. Express

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Strongly squeezed light finds many important applications within the fields of quantum metrology, quantum communication and quantum computation. However, due to the bulkiness and complexity of most squeezed light sources of today, they are still not a standard tool in quantum optics labs. We have taken the first steps in realizing a compact, high-performance 1550 nm squeezing source based on commercially available fiber components combined with a free-space double-resonant parametric down-conversion source. The whole setup, including single-pass second-harmonic generation in a waveguide, fits on a small breadboard and produces 9.3 dB of squeezing at a 5 MHz sidebandfrequency. The setup is currently limited by phase noise, but further optimization and development should allow for a 19" sized turn-key squeezing source capable of delivering more than 10 dB of squeezing.

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“…light for phase locking [7], [8], [15]. So BHD should have sufficiently good performance of not only the noise detection, but also the error signal extraction for phase locking.…”

Section: Introductionmentioning

confidence: 99%

Balanced Homodyne Detector With Independent Phase Control and Noise Detection Branches

et al. 2019

Self Cite

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Squeezed state light is a fundamental resource for many quantum optics experiments. Important applications like quantum-enhanced magnetometer and quantum key distribution, require the squeezing level as high as possible. In balanced homodyne detection, the detector output is directly proportional to the noise of the squeezed beam. The detected quadrature is dependent on the relative phase between the squeezed beam and local oscillator. Here, we present a balanced homodyne detector (BHD) with independent phase control and noise detection branches. The independence between the phase control and noise detection branches is experimentally verified, the two branches are independently optimized according to the practical requirements. With the BHD, a bright squeezed light at 1550 nm with quantum noise reduction of 10.3 dB is directly detected. After stabilizing the relative phase between the squeezed states and local oscillator by the phase locking branch of the BHD, the fluctuation of the noise suppression is ±0.2 dB by 1-h testing time.

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Detection and perfect fitting of 132 dB squeezed vacuum states by considering green-light-induced infrared absorption

Cited by 48 publications

References 39 publications

Enhancement of spin noise spectroscopy of rubidium atomic ensemble by using of the polarization squeezed light

Enhancement of spin noise spectroscopy of rubidium atomic ensemble by using of the polarization squeezed light

Compact, low-threshold squeezed light source

Balanced Homodyne Detector With Independent Phase Control and Noise Detection Branches

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