Author Affiliations
1State Key Laboratory of Precision Spectroscopy, Quantum Institute for Light and Atoms, Department of Physics, East China Normal University, Shanghai 200062, China2School of Electronic Science and Applied Physics, Hefei University of Technology, Hefei 230009, China3Department of Physics, Indiana University-Purdue University Indianapolis, Indianapolis, Indiana 46202, USA4School of Physics and Astronomy, and Tsung-Dao Lee Institute, Shanghai Jiao Tong University, Shanghai 200240, China5e-mail: chyuan@phy.ecnu.edu.cn6e-mail: lqchen@phy.ecnu.edu.cnshow less
Fig. 1. (a) Schematic of the experimental setup. PBS, polarized beam splitter; HWP, half-wave plate; EOM, electro-optic modulator; AOM, acousto-optic modulator; PD, photodetector; AWG, arbitrary wave generator; DPO, digital phosphor oscilloscope. (b) Energy levels of the Rb87 atom and the frequencies of the lasers: |g,m⟩, hyperfine levels |52S1/2,F=1,F=2⟩; |e1,e2⟩, hyperfine levels |52P1/2,F=2⟩ and |52P3/2⟩; W, the Raman pump field; a^in, the initial input Stokes seed; a^out, the output Stokes field via SRS; OP, the optical pumping; S^, the atomic spin wave; R, the read field; b^out, the output anti-Stokes field by the reading process.
Fig. 2. Iteration diagram. a^in,a^in(1),…,a^in(i) are normalized initially input Stokes seeds; a^out,a^out(1),…,a^out(i) are output signals by SRS, corresponding to the ith iteration.
Fig. 3. (a) and (b) a^in is the initially input seed waveform and a^out(0) is the corresponding output signal of SRS. a^out(1) is the output signal of SRS in the first round, a^out(1) is stable waveform after several iteration rounds. (c) Pink circles and green solid triangles are a^out(f) corresponding to different a^in in (a) and (b), respectively.
Fig. 4. (a) and (b) The different energy fluctuations ΔEa^out(0) of a^out(0) and ΔEa^out(f) of a^out(f) during many measurement times. (c) E¯a^out is the average energy of the output Stokes field. Black square and red triangle curves are respective Var(E) for Ea^out(0) and Ea^out(f) both with 100 ns long square-W pulse.
Fig. 5. Black square and red triangle curves are respective Var(EDiff) for a^out(0) and a^out(f) both with the square-W and square-R pulse acquired in the experiment.