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Coherently driving a single quantum two-level system with dichromatic laser pulses

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Author(s)

Yu-Ming He, Hui Wang, Can Wang, M.-C. Chen, Xing Ding, Jian Qin, Z.-C. Duan, Si Chen, J.-P. Li, Run-Ze Liu, C. Schneider, Mete Atatüre, Sven Hoefling, Chao-Yang Lu, Jian-Wei Pan

School/Research organisations

Abstract

The excitation of individual two-level quantum systems using an electromagnetic field is an elementary tool of quantum optics, with widespread applications across quantum technologies. The efficient excitation of a single two-level system usually requires the driving field to be at the same frequency as the transition between the two quantum levels. However, in solid-state implementations, the scattered laser light can dominate over the single photons emitted by the two-level system, imposing a challenge for single-photon sources. Here, we propose a background-free method for the coherent excitation and control of a two-level quantum system using a phase-locked dichromatic electromagnetic field with no spectral overlap with the optical transition. We demonstrate this method experimentally by stimulating single-photon emission from a single quantum dot embedded in a micropillar, reaching single-photon purity of 0.988(1) and indistinguishability of 0.962(6). The phase-coherent nature of our two-colour excitation scheme is demonstrated by the dependence of the resonance fluorescence intensity on the relative phase between the two pulses. Our two-colour excitation method represents an additional and useful tool for the study of atom–photon interaction, and the generation of spectrally isolated indistinguishable single photons.
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Original languageEnglish
Number of pages6
JournalNature Physics
DOIs
Publication statusPublished - 15 Jul 2019

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