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首页> 外文期刊>Physical review >From strong to weak temperature dependence of the two-photon entanglement resulting from the biexciton cascade inside a cavity
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From strong to weak temperature dependence of the two-photon entanglement resulting from the biexciton cascade inside a cavity

机译：腔内双激子级联引起的双光子纠缠从强到弱的温度依赖性

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摘要

We investigate the degree of entanglement quantified by the concurrence of photon pairs that are simultaneously emitted in the biexciton-exciton cascade from a quantum dot in a cavity. Four dot-cavity configurations are compared that differ with respect to the detuning between the cavity modes and the quantum dot transitions, corresponding to different relative weights of direct two-photon and sequential single-photon processes. The dependence of the entanglement on the exciton fine-structure splitting delta is found to be significantly different for each of the four configurations. For a finite splitting and low temperatures, the highest entanglement is found when the cavity modes are in resonance with the two-photon transition between the biexciton and the ground state and, in addition, the biexciton has a finite binding energy of a few meV. However, this widely used configuration is rather strongly affected by phonons such that other dot-cavity configurations, that are commonly regarded as less suited for obtaining high degrees of entanglement, become more favorable already at temperatures on the order of 10 K and above. If the cavity modes are kept in resonance with one of the exciton-to-ground-state transitions and the biexciton binding energy is finite, the entanglement drastically drops for positive delta with rising temperatures when T is below similar or equal to 4 K, but is virtually independent of the temperature for higher T.
机译：我们调查纠缠的程度由光子对的并发量化，光子对的同时在双激子-激子级联中从腔中的量子点发出。比较了四种点腔结构，它们在腔模和量子点跃迁之间的失谐方面不同，分别对应于直接双光子过程和顺序单光子过程的不同相对权重。对于四种构型的每一种，发现纠缠对激子精细结构分裂δ的依赖性显着不同。对于有限的分裂和低温，当腔模与双激子和基态之间的双光子跃迁共振时，发现最大的纠缠，此外，双激子具有几meV的有限结合能。然而，这种广泛使用的构型受到声子的强烈影响，以致于通常被认为不太适合获得高缠结度的其他点腔构型，在大约10 K或更高的温度下已经变得更加有利。如果腔模与激子到基态跃迁之一保持共振，并且双激子束缚能是有限的，则当T低于相似或等于4 K时，随着温度升高，纠缠对于正增量将急剧下降。实际上与较高T的温度无关。

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  • 来源
    《Physical review》 |2019年第24期|245301.1-245301.13|共13页
  • 作者

    Seidelmann T.; Ungar F.; Cygorek M.; Vagov A.; Barth A. M.; Kuhn T.; Axt V. M.;

  • 作者单位

    Univ Bayreuth, Lehrstuhl Theoret Phys 3, D-95440 Bayreuth, Germany;

    Univ Bayreuth, Lehrstuhl Theoret Phys 3, D-95440 Bayreuth, Germany;

    Univ Ottawa, Dept Phys, Ottawa, ON K1N 6N5, Canada;

    Univ Bayreuth, Lehrstuhl Theoret Phys 3, D-95440 Bayreuth, Germany|ITMO Univ, St Petersburg 197101, Russia;

    Univ Bayreuth, Lehrstuhl Theoret Phys 3, D-95440 Bayreuth, Germany;

    Univ Munster, Inst Festkorpertheorie, D-48149 Munster, Germany;

    Univ Bayreuth, Lehrstuhl Theoret Phys 3, D-95440 Bayreuth, Germany;

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