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arXiv 2408.01698quant-ph
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压缩光驱动的二能级系统稳态发射中的Wigner负态

Wigner-negative states in the steady-state emission of a two-level system driven by squeezed light

Miriam. J. Leonhardt, Scott Parkins

AI总结:

本研究采用级联量子系统模型,理论证明有限带宽正交压缩光驱动的二能级系统稳态发射时域模式可确定性产生Wigner负性,为量子光学负态制备提供了确定性新方案。

摘要:

具有负值Wigner分布的传播光模式在量子光学中具有基础研究意义,也是发展基于光学的量子信息技术的关键资源。目前已提出或实现的这类模式的产生方案大多本质上是概率性的,依赖光子探测的预告机制,或是通过分束器将光子从原始场模式中分离的条件性方法。在本《快报》中,我们采用级联量子系统模型从理论上证明:在有限带宽正交压缩光驱动的二能级系统的稳态发射时域模式中,存在确定性产生Wigner负性的可能性。当压缩带宽与二能级系统的跃迁线宽相近时,可获得最优负性。尽管入射压缩光对应的Wigner分布是高斯型且处处为正,但出射时域模式的Wigner函数与位移压缩态的叠加态呈现出明显的相似性与重叠。

英文摘要:

Propagating modes of light with negative-valued Wigner distributions are of fundamental interest in quantum optics and represent a key resource in the pursuit of optics-based quantum information technologies. Most schemes proposed or implemented for the generation of such modes are probabilistic in nature and rely on heralding by detection of a photon or on conditional methods where photons are separated from the original field mode by a beam splitter. In this Letter we demonstrate theoretically, using a cascaded-quantum-systems model, the possibility of deterministic generation of Wigner-negativity in temporal modes of the steady-state emission of a two-level system driven by finite-bandwidth quadrature-squeezed light. Optimal negativity is obtained for a squeezing bandwidth similar to the linewidth of the transition of the two-level system. While the Wigner distribution associated with the incident squeezed light is Gaussian and everywhere positive, the Wigner functions of the outgoing temporal modes show distinct similarities and overlap with a superposition of displaced squeezed states.

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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