Compact sub-kilohertz low-frequency quantum light source based on four-wave mixing in cesium vapor

Ma, R.; Liu, Wei; Qin, Zhongzhong; Su, Xiaolong; Jia, Xiaojun; Zhang, Junxiang; Gao, Jiangrui

doi:10.1364/ol.43.001243

Cited by 23 publications

(16 citation statements)

References 38 publications

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“…We believe that with the present 4WM scheme a single-frame image with an approximately 1 microsecond long pulse of light onto a CCD camera could provide sub-shot-noise intensity-difference imaging. In the seeded 4WM process the small phase-matching angle (≈ 0.1 • to 0.2 • in potassium vapor [20,21]; ≈ 0.3 • to 0.5 • in rubidium vapor [10,22,23]; ≈ 0.3 • in cesium vapor [24]) limits the high spatial frequency parts of the twin images when being reimaged when we use the imaging setup (Fig. 2 (b)).…”

Section: Discussionmentioning

confidence: 99%

Two-beam Coupling in the Production of Quantum Correlated Images by Four-wave Mixing

Wu,

Brewer,

Speirs

et al. 2021

Preprint

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We investigate the effect of 2-beam coupling in different imaging geometries in generating intensity-difference squeezing from four-wave mixing (4WM) in Rb atomic vapors. A recently-introduced dual-seeding technique can cancel out the classical noise in a seeded fourwave mixing process. This dual-seeding technique, however, can introduce new complications that involve 2-beam coupling between different seeded spatial modes in the atomic vapor and can ruin squeezing at frequencies on the order of the atomic linewidth and below. This complicates some forms of quantum imaging using these systems. Here we show that seeding the 4WM process with skew rays can eliminate the excess noise caused by 2-beam coupling. To avoid 2-beam coupling in bright, seeded images, it is important to re-image the object in the gain medium, instead of focussing through it.

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Section: Discussionmentioning

confidence: 99%

Two-beam Coupling in the Production of Quantum Correlated Images by Four-wave Mixing

Wu,

Brewer,

Speirs

et al. 2021

Preprint

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“…Previous experiments have reported twin-beam intensitydifference squeezing from 4WM down into the kHz range [16,25,26]. Very recently Ma et al [17] reported such squeezing down to frequencies below 700 Hz. In the context of imaging, Kumar et al [27] performed intensity-differencing on an EM-CCD camera using a 4WM source similar to ours and were able to obtain a subtraction noise level 2 dB below shot noise.…”

Section: Introductionmentioning

confidence: 94%

“…Single-mode quadrature squeezing has perhaps its most important applications in future gravity-wave interferometers [12][13][14], and such squeezing at frequencies as low as 1 Hz has been observed from an optical parametric oscillator (OPO) with this application in mind [14,15]. Squeezing has not been reported at such low frequencies for two-mode intensity-difference measurements, and the best results seem to be ≈ 1.5 kHz reported in [16], and ≈ 700 Hz recently reported in [17].…”

Section: Introductionmentioning

confidence: 99%

Twin-beam intensity-difference squeezing below 10 Hz

Schmittberger

Brewer

et al. 2019

Opt. Express

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We report the generation of strong, bright-beam intensity-difference squeezing down to measurement frequencies below 10 Hz. We generate two-mode squeezing in a four-wave mixing (4WM) process in Rb vapor, where the single-pass-gain nonlinear process does not require cavity locking and only relies on passive stability. We use diode laser technology and several techniques, including dual seeding, to remove the noise introduced by seeding the 4WM process as well as the background noise. Twin-beam intensity-difference squeezing down to frequencies limited only by the mechanical and atmospheric stability of the lab is achieved. These results should enable important low-frequency applications such as direct intensity-difference imaging with bright beams on integrating detectors.

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“…Turnbull et al studied a range of angles for a proper phase matching condition to obtain high gain on a typical 4WM process [12]. The quantum correlations in a 4WM is drastically reduced for smaller angles between the probe and conjugate beams, and it was shown that below 2 mrads the intensity difference squeezing is lost [13].…”

mentioning

confidence: 99%

Quantum noise correlations of an optical parametric oscillator based on a non-degenerate four wave mixing process in hot alkali atoms

Guerrero,

Nussenzveig,

Martinelli

et al. 2020

Preprint

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We present the first measurement of two-mode squeezing between the twin beams produced by a doubly resonant optical parameter oscillator (OPO) in above threshold operation, based on parametric amplification by non degenerate four wave mixing with rubidium 85 Rb. We demonstrate a maximum intensity difference squeezing of -2.7 dB (-3,5 dB corrected for losses) with a pump power of 285 mW and an output power of 12 mW for each beam, operating close to the D1 line of Rb atoms. The possibility to use open cavities combined with the high gain media can provide a strong level of noise compression, and the access to new operation regimes that could not be explored by crystal based OPOs. The spectral bandwidth of the squeezed light is broadened by the cavity dynamics, and the squeezing level is robust for strong pump powers. Stable operation was obtained up to four times above the threshold. Moreover, its operation close to the atomic resonances of alkali atoms allows a natural integration into quantum networks including structures such as quantum memories.

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Compact sub-kilohertz low-frequency quantum light source based on four-wave mixing in cesium vapor

Cited by 23 publications

References 38 publications

Two-beam Coupling in the Production of Quantum Correlated Images by Four-wave Mixing

Two-beam Coupling in the Production of Quantum Correlated Images by Four-wave Mixing

Twin-beam intensity-difference squeezing below 10 Hz

Quantum noise correlations of an optical parametric oscillator based on a non-degenerate four wave mixing process in hot alkali atoms

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