Entanglement of propagating optical modes via a mechanical interface.,Nature Communications

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Entanglement of propagating optical modes via a mechanical interface.
Nature Communications ( IF 14.7 ) Pub Date : 2020-02-18 , DOI: 10.1038/s41467-020-14768-1
Junxin Chen _{1,

2} , Massimiliano Rossi _{1,

2} , David Mason _{1,

2,

3} , Albert Schliesser _{1,

2}

Affiliation

Many applications of quantum information processing (QIP) require distribution of quantum states in networks, both within and between distant nodes. Optical quantum states are uniquely suited for this purpose, as they propagate with ultralow attenuation and are resilient to ubiquitous thermal noise. Mechanical systems are then envisioned as versatile interfaces between photons and a variety of solid-state QIP platforms. Here, we demonstrate a key step towards this vision, and generate entanglement between two propagating optical modes, by coupling them to the same, cryogenic mechanical system. The entanglement persists at room temperature, where we verify the inseparability of the bipartite state and fully characterize its logarithmic negativity by homodyne tomography. We detect, without any corrections, correlations corresponding to a logarithmic negativity of EN = 0.35. Combined with quantum interfaces between mechanical systems and solid-state qubit processors, this paves the way for mechanical systems enabling long-distance quantum information networking over optical fiber networks.

中文翻译：

通过机械接口传播光学模式的纠缠。

量子信息处理 (QIP) 的许多应用都需要在网络中分布量子态，无论是在远程节点内部还是在远程节点之间。光量子态特别适合此目的，因为它们以超低衰减传播，并且对普遍存在的热噪声具有弹性。机械系统被设想为光子和各种固态 QIP 平台之间的多功能接口。在这里，我们展示了实现这一愿景的关键一步，并通过将两种传播的光学模式耦合到相同的低温机械系统来在它们之间产生纠缠。这种纠缠在室温下持续存在，我们验证了二分态的不可分离性，并通过零差断层扫描充分表征了其对数负性。我们在没有任何校正的情况下检测到对应于 EN = 0.35 的对数负性的相关性。结合机械系统和固态量子位处理器之间的量子接口，这为机械系统通过光纤网络实现长距离量子信息网络铺平了道路。

更新日期：2020-02-18

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