https://scholars.lib.ntu.edu.tw/handle/123456789/626554
標題: | Spectral shaping of the biphoton state from multiplexed thermal atomic ensembles | 作者: | Chang, TH GUIN-DAR LIN Jen, HH |
關鍵字: | spectral shaping; biphoton state; frequency multiplexing; Schmidt decomposition; ANGULAR-MOMENTUM STATES; QUANTUM ENTANGLEMENT; INFORMATION; GENERATION; RADIATION; EFFICIENT; PAIRS | 公開日期: | 2020 | 出版社: | IOP PUBLISHING LTD | 卷: | 53 | 期: | 8 | 來源出版物: | JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND OPTICAL PHYSICS | 摘要: | We theoretically investigate the spectral property of a biphoton state from multiplexed thermal atomic ensembles. This biphoton state originates from the cascade emissions, which can be generated by two weak pump fields under four-wave mixing condition. Under this condition, a signal photon from the upper transition, chosen in a telecommunication bandwidth, can be generated along with a correlated idler photon from the lower infrared transition. We can spectrally shape the biphoton state by multiplexing the atomic ensembles with frequency-shifted emissions, where the entropy of entanglement can be analyzed via Schmidt decompositions. We find that this spectral entanglement increases when more vapor cells are multiplexed with correlated or anti-correlated signal and idler fields. The eigenvalues in Schmidt bases approach degenerate under this multiplexing scheme, and corresponding Schmidt numbers can be larger than the number of the multiplexed vapor cells, showing the enlarged entropy of entanglement and excess correlated modes in continuous frequency spaces. We also investigate the lowest entropy of entanglement allowed in the multiplexing scheme, which is preferential for generating a pure single photon source. This shows the potentiality to spectrally shape the biphoton source, where high-capacity spectral modes can be applied in long-distance quantum communication and multimode quantum information processing. |
URI: | https://scholars.lib.ntu.edu.tw/handle/123456789/626554 | ISSN: | 0953-4075 | DOI: | 10.1088/1361-6455/ab7556 |
顯示於: | 物理學系 |
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