Generation of polarization squeezed light with an optical parametric amplifier at 795 nm

Han, Yongqin; Xu, Wen; Liu, Jinyu; He, Jun; Wang, Junmin

doi:10.1016/j.optcom.2018.01.038

Cited by 9 publications

(4 citation statements)

References 33 publications

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“…From this, we can conclude that the nonstatic wave treated here is a kind of squeezed state. Several methods of generating squeezed states are known until now [18][19][20][21][22]. Likewise, the nonstatic wave may also be generated by using the technique of squeezed-state generation.…”

Section: Discussionmentioning

confidence: 99%

Clarifying Nonstatic-Quantum-Wave Behavior Through Extending Its Analysis to the p-Quadrature Space: Interrelation Between the q- and p-Space Wave-Nonstaticities

Choi

2022

Front. Phys.

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If electromagnetic parameters of a medium vary in time, quantum light waves traveling in it become nonstatic. A recent report shows that such nonstatic waves can also appear even when the environment is static where the parameters of the medium do not vary. In this work, the properties of nonstatic waves in a static environment are investigated from their p-space analysis, focusing on the interrelation between the q- and p-space nonstatic waves. The probability densities in p-space (as well as in q-space) for both the nostatic Fock and Gaussian states evolve in a periodic manner, i.e., they constitute belly and node in turn successively as time goes by. If we neglect the displacement of waves, the q- and p-space wave phases are opposite each other. Since the intensity of the wave in each space is relatively large whenever the wave forms a belly, such a phase difference indicates that periodical intensity exchange between the q- and p-component waves takes place through their nonstatic evolutions. This is the novel reciprocal optical phenomenon arisen on account of the wave nonstaticity.

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Section: Discussionmentioning

confidence: 99%

Clarifying Nonstatic-Quantum-Wave Behavior Through Extending Its Analysis to the p-Quadrature Space: Interrelation Between the q- and p-Space Wave-Nonstaticities

Choi

2022

Front. Phys.

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“…In our system, the power noise of different quantum Stokes operator can be measured by the combination of a HWP and a quarter wave plates (QWP), where the Stokes operator Λ S 2 can be measured by placing a HWP in the balanced homodyne detector (BHD) system when the angle between the axis of HWP and the polarization direction of the incident light field is 21.5°. At this point, if a QWP is placed behind the HWP and the angle set at 45°, then the noise of Stoker operator Λ S 3 can be measured [16]. Two kinds of laser beams must be focused via a lens before entering the atomic vapor cell to make inherent spin fluctuations more relevant and easier to measure.…”

Section: Methodsmentioning

confidence: 99%

“…In SNS measurement, the input laser fields should be continuous PSS of light. Synthesizing the SV (spolarized) and LO beam (p-polarized) in a certain phase, the PSS of light can be produced after QNL [16,25], its squeezing level is generally lower than corresponding level measured by scanning mode due to the instability of phase locking. Finally, the relative noise power of stokes operator of Λ S 2 is -5.3±0.7 dB, shown in figure 3(b).…”

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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“…where we denote operator variances by Var 𝑋 = 𝑋 2 − 𝑋 2 , have led to the fruitful discovery and implementation of "polarization squeezing," which may ultimately have applications in quantum-enhanced polarimetry and other communication tasks (Abdel-Aty et al, 2002;Agarwal and Puri, 1994;Alodjants et al, 1998;Alodzhants et al, 1995;Andersen and Buchhave, 2003;Bai et al, 2021;Barreiro et al, 2011;Beduini and Mitchell, 2013;Birrittella et al, 2021;Bowen et al, 2002;Brif and Mann, 1996;Chaudhury et al, 2007;Chirkin, 2015;Chirkin et al, 1993;Civitarese et al, 2013;Corney et al, 2008;Dong et al, 2008;Gühne and Tóth, 2009;Golubev et al, 2004;Gross, 2012;Hald et al, 1999;Han et al, 2018;He et al, 2011;Heersink et al, 2003Heersink et al, , 2005Hillery and Mlodinow, 1993;Hsu et al, 2009;Iskhakov et al, 2009;Josse et al, 2003;Karassiov, 1994;Kitagawa and Ueda, 1993;Klimov and Muñoz, 2013;Klyshko, 1997;Korolkova et al, 2002;Korolkova and Loudon, 2005;Lassen et al, 2007;Luis and Korolkova, 2006;Ma et al, 2011;Mahler et al, 2010;…”

Section: Quantum Polarizationmentioning

confidence: 99%

Quantum Polarimetry

Goldberg

2021

Preprint

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Polarization is one of light's most versatile degrees of freedom for both classical and quantum applications. The ability to measure light's state of polarization and changes therein is thus essential; this is the science of polarimetry. It has become ever more apparent in recent years that the quantum nature of light's polarization properties is crucial, from explaining experiments with single or few photons to understanding the implications of quantum theory on classical polarization properties. We present a self-contained overview of quantum polarimetry, including discussions of classical and quantum polarization, their transformations, and measurements thereof. We use this platform to elucidate key concepts that are neglected when polarization and polarimetry are considered only from classical perspectives.

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Generation of polarization squeezed light with an optical parametric amplifier at 795 nm

Cited by 9 publications

References 33 publications

Clarifying Nonstatic-Quantum-Wave Behavior Through Extending Its Analysis to the p-Quadrature Space: Interrelation Between the q- and p-Space Wave-Nonstaticities

Clarifying Nonstatic-Quantum-Wave Behavior Through Extending Its Analysis to the p-Quadrature Space: Interrelation Between the q- and p-Space Wave-Nonstaticities

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

Quantum Polarimetry

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