Tunable phononic coupling in excitonic quantum emitters
Tunable phononic coupling in excitonic quantum emitters
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DOI：
10.1038/s41565-023-01410-6
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发表时间：
2023-06-01
影响因子：
38.3
通讯作者：
Li，Mo
中科院分区：
文献类型：
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作者：
Ripin，Adina;Peng，Ruoming;Li，Mo
设计基本量子激发之间的耦合是量子科学和技术的核心。一个突出的例子是量子光源的创造，其中单光子和声子之间的耦合可以被控制和利用，以实现量子信息转换。在这里，我们报告的确定性创建的量子发射器具有高度可调的激子和声子之间的耦合。量子发射体形成在均质双层WSe 2中产生的应变诱导量子点中。量子限制层间激子和太赫兹层间呼吸模式声子的共定位，直接调制激子能量，导致一个独特的强声子耦合到单光子发射，黄-里斯因子高达6.3。层间激子发射的单光子谱具有>83%的单光子纯度和多个声子副本，每个声子副本预示着量子发射体中声子Fock态的创建。由于层间激子的垂直偶极矩，声子-光子相互作用是电可调的，高于激子和声子的退相干率，因此有望达到强耦合制度。我们的研究结果表明，在WSe 2双层的原子界面处的固态量子激子-光机械系统发射与静止声子耦合的飞行光子量子比特，这可以用于量子转导和互连。
Engineering the coupling between fundamental quantum excitations is at the heart of quantum science and technologies. An outstanding case is the creation of quantum light sources in which coupling between single photons and phonons can be controlled and harnessed to enable quantum information transduction. Here we report the deterministic creation of quantum emitters featuring highly tunable coupling between excitons and phonons. The quantum emitters are formed in strain-induced quantum dots created in homobilayer WSe2. The colocalization of quantum-confined interlayer excitons and terahertz interlayer breathing-mode phonons, which directly modulates the exciton energy, leads to a uniquely strong phonon coupling to single-photon emission, with a Huang–Rhys factor reaching up to 6.3. The single-photon spectrum of interlayer exciton emission features a single-photon purity >83% and multiple phonon replicas, each heralding the creation of a phonon Fock state in the quantum emitter. Due to the vertical dipole moment of the interlayer exciton, the phonon–photon interaction is electrically tunable to be higher than the exciton and phonon decoherence rate, and hence promises to reach the strong-coupling regime. Our result demonstrates a solid-state quantum excitonic–optomechanical system at the atomic interface of the WSe2bilayer that emits flying photonic qubits coupled with stationary phonons, which could be exploited for quantum transduction and interconnection.