Camacho Ryan M, Broadbent Curtis J, Ali-Khan Irfan, Howell John C
Department of Physics and Astronomy, University of Rochester, Rochester, New York 14627, USA.
Phys Rev Lett. 2007 Jan 26;98(4):043902. doi: 10.1103/PhysRevLett.98.043902. Epub 2007 Jan 22.
Two-dimensional images carried by optical pulses (2 ns) are delayed by up to 10 ns in a 10 cm cesium vapor cell. By interfering the delayed images with a local oscillator, the transverse phase and amplitude profiles of the images are shown to be preserved. It is further shown that delayed images can be well preserved even at very low light levels, where each pulse contains on average less than one photon.
光脉冲（2纳秒）携带的二维图像在一个10厘米的铯蒸汽室中最多延迟10纳秒。通过将延迟后的图像与一个本地振荡器进行干涉，结果表明图像的横向相位和幅度分布得以保留。进一步的研究表明，即使在极低的光强水平下，延迟图像也能得到很好的保留，此时每个脉冲平均包含不到一个光子。
