Femtowatt-light-level phase measurement of slow light pulses via beat-note interferometer.
We report on an experimental demonstration of applying the beat-note interferometer to simultaneously measure the phase and amplitude variations of light pulses after propagating through an electromagnetically induced transparency medium at femtowatt-light levels. Furthermore, we observe that the measured phase noise approaches the shot-noise level arising from the fluctuations of detected photons.
Lo
Hsiang-Yu
HY
Department of Physics, National Cheng Kung University, Tainan 701, Taiwan.
Su
Po-Ching
PC
Cheng
Yu-Wei
YW
Wu
Pin-I
PI
Chen
Yong-Fan
YF
D000162:Acoustics / Q000295:instrumentation*; D004867:Equipment Design; D007368:Interferometry / Q000295:instrumentation* / Q000379:methods*; D007834:Lasers; D008027:Light; D008962:Models, Theoretical; D055100:Optical Fibers; D017785:Photons