Efficient frequency conversion based on resonant four-wave mixing
- URL: http://arxiv.org/abs/2012.08070v3
- Date: Tue, 29 Dec 2020 02:26:50 GMT
- Title: Efficient frequency conversion based on resonant four-wave mixing
- Authors: Chin-Yao Cheng, Zi-Yu Liu, Pi-Sheng Hu, Tsai-Ni Wang, Chung-Yu Chien,
Jia-Kang Lin, Jz-Yuan Juo, Jiun-Shiuan Shiu, Ite A. Yu, Ying-Cheng Chen, and
Yong-Fan Chen
- Abstract summary: An efficient frequency conversion system using a double-$Lambda$ four-wave mixing (FWM) process has attracted considerable attention.
A simple solution is to arrange the applied laser fields in a backward configuration.
Here, we demonstrate that the phase mismatch can be effectively compensated by introducing the phase shift obtained by two-photon detuning.
- Score: 3.6404423435851547
- License: http://creativecommons.org/licenses/by/4.0/
- Abstract: Efficient frequency conversion of photons has important applications in
optical quantum technology because the frequency range suitable for photon
manipulation and communication usually varies widely. Recently, an efficient
frequency conversion system using a double-$\Lambda$ four-wave mixing (FWM)
process based on electromagnetically induced transparency (EIT) has attracted
considerable attention because of its potential to achieve a nearly 100%
conversion efficiency (CE). To obtain such a high CE, the spontaneous emission
loss in this resonant-type FWM system must be suppressed considerably. A simple
solution is to arrange the applied laser fields in a backward configuration.
However, the phase mismatch due to this configuration can cause a significant
decrease in CE. Here, we demonstrate that the phase mismatch can be effectively
compensated by introducing the phase shift obtained by two-photon detuning.
Under optimal conditions, we observe a wavelength conversion from 780 to 795 nm
with a maximum CE of 91.2(6)% by using this backward FWM system at an optical
depth of 130 in cold rubidium atoms. The current work represents an important
step toward achieving low-loss, high-fidelity EIT-based quantum frequency
conversion.
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