AI Article Synopsis
- - The study demonstrates that optically active spin systems coupled with photonic cavities can achieve strong light-matter interactions, crucial for building quantum networks.
- - Researchers achieved a high cooperativity of 8 by using a specially designed bullseye cavity that efficiently accesses circularly polarized light, which is important for controlling spin coherence.
- - They observed significant improvements in spontaneous emission lifetimes and transparency in light reflected from the cavity, which could aid in developing photon switching techniques and advancing quantum network technologies.
Article Abstract
Optically active spin systems coupled to photonic cavities with high cooperativity can generate strong light-matter interactions, a key ingredient in quantum networks. However, obtaining high cooperativities for quantum information processing often involves the use of photonic crystal cavities that feature a poor optical access from the free space, especially to circularly polarized light required for the coherent control of the spin. Here, we demonstrate coupling with a cooperativity as high as 8 of an InAs/GaAs quantum dot to a fabricated bullseye cavity that provides nearly degenerate and Gaussian polarization modes for efficient optical accessing. We observe spontaneous emission lifetimes of the quantum dot as short as 80 ps (an ∼15 Purcell enhancement) and a ∼80% transparency of light reflected from the cavity. Leveraging the induced transparency for photon switching while coherently controlling the quantum dot spin could contribute to ongoing efforts of establishing quantum networks.
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| http://dx.doi.org/10.1021/acs.nanolett.2c03098 | DOI Listing |
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