Four-wave mixing in potassium vapor with an off-resonant double-
<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mi mathvariant="normal">Λ</mml:mi></mml:math>
 system

Ćurčić, M. M.; Khalifa, T.; Zlatković, B.; Radojičić, I. S.; Krmpot, Aleksandar J.; Arsenović, D.; Jelenković, Branislav; Gharavipour, Mohammadreza

doi:10.1103/physreva.97.063851

Cited by 8 publications

(1 citation statement)

References 38 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…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

View full text Add to dashboard Cite

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.

show abstract