Entangled Photons from a Single Molecule, for Experiments on Single Emitters, Quantum Memories and Atomic Gases

该提议旨在实现一种新的光子纠缠源。所提出的源将解决目前可用的源的两个主要缺点：a）对近红外光学光子的限制和B）缺少光谱叠加和与原子量子存储器的对准。这两个特征都可以通过使用来自单个发射器的单个光子来实现，并且随后通过全光门使它们纠缠。虽然这两个部分的建议实现之前已经实现，他们的组合提出了许多挑战的实验。最终的实现将允许产生的光子与原子蒸气的光学相互作用，这可以实现量子存储器。或者，可替代地，几个单个发射器之间的光学相互作用。我们相信，我们的光子纠缠的新资源允许在光谱亮度和通量方面上级，或至少相当于现有的源，这都是在提案中审查。在光谱的蓝色部分对光谱简并纠缠的扩展，扩展了可用的量子存储器和静止量子比特的范围，用于未来的应用，例如量子中继器。

This proposal aims to enable a novel source of photonic entanglement. The purposed source will address two main drawbacks of the presently available sources: a) the limitation to nearinfrared optical photons and b) the missing spectral superposition and alignment to an atomic quantum memory. Both features can be fulfilled by using single photons originating from a single emitter, and entangling them subsequently by an all-optical gate. Although both parts of the suggested implementation were realized before, their combination poses many challenges to the experimentalists. The final implementation will allow an optical interaction of the generated photons with atomic vapors, which can implement a quantum memory. Or, alternatively, an optical interaction among several single emitters. We believe, that our novel resource of photonic entanglement allows to be in terms of spectral brightness and flux superior, or at least equivalent, to the existing sources, which are all reviewed in the proposal. The extension to spectral degenerateentanglement in the blue part of the spectrum, extends the range of usable quantum memories and stationary qubits for future applications, such as quantum repeaters.