Journal
CHINESE PHYSICS B
Volume 31, Issue 3, Pages -Publisher
IOP Publishing Ltd
DOI: 10.1088/1674-1056/ac3652
Keywords
spectral-purity; microring; asymmetric Mach-Zehnder interferometer
Categories
Funding
- National Basic Research Program of China [2019YFA0308700, 2017YFA0303700]
- Open Funds from the State Key Laboratory of High Performance Computing of China (HPCL, National University of Defense Technology)
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In this experiment, a high-spectral-purity single-photon source is engineered using a single-interferometer-coupled silicon microring. By adjusting the interferometer, different coupling conditions are achieved, leading to different quality factors for the pump and signal/idler. The spectral correlation of the signal and idler is intuitively demonstrated, and it is shown that higher quality factors result in increased spectral purity. The measurement of time-integrated second-order correlation of the signal photons yields a high value, indicating the potential for enhancing quantum interference and on-chip quantum information processing.
We experimentally engineer a high-spectral-purity single-photon source using a single-interferometer-coupled silicon microring. By the reconfiguration of the interferometer, different coupling conditions can be obtained, corresponding to different quality factors for the pump and signal/idler. The ratio between the quality factor of the pump and signal/idler ranges from 0.29 to 2.57. By constructing the signal-idler joint spectral intensity, we intuitively demonstrate the spectral correlation of the signal and idler. As the ratio between the quality factor of the pump and signal/idler increases, the spectral correlation of the signal and idler decreases, i.e., the spectral purity of the signal/idler photons increases. Furthermore, time-integrated second-order correlation of the signal photons is measured, giving a value up to 94.95 +/- 3.46%. Such high-spectral-purity photons will improve the visibility of quantum interference and facilitate the development of on-chip quantum information processing.
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