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arXiv 2205.03390quant-ph
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双光子激发限制了量子发射体产生纠缠光子对

Two-Photon Excitation Sets Limit to Entangled Photon Pair Generation from Quantum Emitters

Tim Seidelmann, Christian Schimpf, Thomas K. Bracht, Michael Cosacchi, Alexei Vagov, Armando Rastelli, Doris E. Reiter, Vollrath Martin Axt

摘要:

纠缠光子对是量子技术中许多新应用的关键。半导体量子点可以用作按需高度纠缠光子的来源。对固定最大纠缠态的保真度受到激子精细结构分裂的限制。这项工作表明,即使这种分裂是不存在的,纠缠度不能达到统一时,在双光子共振方案的激发脉冲具有有限的持续时间。纠缠度的退化源于激光脉冲本身引起的激子态的动态诱导分裂。因此,在这里探索的设置中,激发过程限制了在光激发的四能级量子发射器中产生的纠缠光子的可实现的并发。

英文摘要:

Entangled photon pairs are key to many novel applications in quantum technologies. Semiconductor quantum dots can be used as sources of on-demand, highly entangled photons. The fidelity to a fixed maximally entangled state is limited by the excitonic fine-structure splitting. This work demonstrates that, even if this splitting is absent, the degree of entanglement cannot reach unity when the excitation pulse in a two-photon resonance scheme has a finite duration. The degradation of the entanglement has its origin in a dynamically induced splitting of the exciton states caused by the laser pulse itself. Hence, in the setting explored here, the excitation process limits the achievable concurrence for entangled photons generated in an optically excited four-level quantum emitter.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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