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Filtering multiphoton emission from state-of-the-art cavity quantum electrodynamics
Optica ( IF 10.4 ) Pub Date : 2018-01-08 , DOI: 10.1364/optica.5.000014
Carlos Sánchez Muñoz , Fabrice P. Laussy , Elena del Valle , Carlos Tejedor , Alejandro González-Tudela

Engineering multiphoton states is an outstanding challenge with applications in multiple fields such as quantum metrology, quantum lithography, or even biological sensing. State-of-the-art methods to obtain them rely on post-selection, multi-level systems, or Rydberg atomic ensembles. Recently, it was shown that a strongly driven two-level system interacting with a detuned cavity mode can be engineered to continuously emit n-photon states. In the present work, we show that spectral filtering of its emission relaxes considerably the requirements on the system parameters even to the more accessible bad-cavity situation, opening up the possibility of implementing this protocol in a much wider landscape of different platforms. This improvement is based on a key observation: in the imperfect case where only a certain fraction of emission is composed of n-photon states, these have a well-defined energy separated from the rest of the signal, which allows one to reveal and purify multiphoton emission just by frequency filtering. We demonstrate these results by obtaining analytical expressions for the relevant figures of merit of multiphoton emission, such as the n-photon coupling rate between cavity and emitter, the fraction of light emitted as n-photon states, and n-photon emission rates. This allows us to make a systematic study of such figures of merit as a function of the system parameters and demonstrate the viability of the protocol in several relevant types of cavity quantum electrodynamics setups, where we take into account the impact of their respective experimental limitations.

中文翻译:

从最新的腔量子电动力学中滤除多光子发射

在诸如量子计量,量子光刻甚至生物传感等多个领域的应用中,工程化多光子状态是一个巨大的挑战。获得它们的最新方法依赖于后选择,多层系统或Rydberg原子团。最近,研究表明,可以设计一个与失谐腔模式相互作用的强驱动两级系统,使其连续发射ñ-光子状态。在当前的工作中,我们表明,其发射的光谱过滤甚至可以放宽对系统参数的要求,甚至适用于更易于访问的不良腔情况,从而为在不同平台的更广阔环境中实施此协议提供了可能性。此改进基于以下关键观察:在不完美的情况下,只有一定比例的排放由ñ-光子状态,它们具有与其余信号分开的明确定义的能量,这使人们仅通过频率滤波就可以揭示和净化多光子发射。我们通过获得多光子发射相关品质因数的解析表达式来证明这些结果,例如ñ腔与发射器之间的光子耦合速率,以 ñ-光子状态,以及 ñ-光子发射速率。这使我们能够根据系统参数对这些品质因数进行系统的研究,并在几种相关类型的腔量子电动力学设置中证明该协议的可行性,其中我们考虑了它们各自实验限制的影响。
更新日期:2018-01-19
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