标题： 量子网络的无条件纠缠接口 显示英文标题

标题： An unconditional entanglement interface for quantum networks

摘要： 纠缠驱动几乎所有提出的量子信息技术。 在联合正交测量中，不确定性抑制低于真空涨落水平是非经典关联的特征。 近年来，对光学场频率模式的纠缠引起了越来越多的关注，因为量子网络将依赖于在电信波长与可在可见波长下寻址的基于物质的量子存储器之间进行接口连接。 通过将1550纳米压缩真空态的一部分上转换到532纳米，我们展示了在相隔很远的频率之间生成和完全表征强连续变量纠缠。 在1550纳米和532纳米场的联合正交测量中观察到了非经典关联，显示出最大噪声抑制比真空低5.5分贝。 测量了频谱以展示高达20兆赫测量频率的超过3分贝噪声抑制。 我们的通用技术结合了强非经典关联、大带宽以及原则上能够将1550纳米的电信波长与任何光学波长纠缠的能力，使这种方法对新兴的量子通信和计算提案具有高度相关性。 显示英文摘要

摘要： Entanglement drives nearly all proposed quantum information technologies. The suppression of the uncertainty in joint quadrature measurements below the level of vacuum fluctuations is a signature of non-classical correlations. Entangling frequency modes of optical fields has attracted increased attention in recent years, as a quantum network would rely on interfacing light at telecommunication wavelengths with matter-based quantum memories that are addressable at visible wavelengths. By up-converting part of a 1550 nm squeezed vacuum state to 532 nm, we demonstrate the generation and complete characterization of strong continuous-variable entanglement between widely separated frequencies. Non-classical correlations were observed in joint quadrature measurements of the 1550 nm and 532 nm fields, showing a maximum noise suppression 5.5 dB below vacuum. A spectrum was measured to demonstrate over 3 dB noise suppression up to 20 MHzmeasurement frequency. Our versatile technique combines strong non-classical correlations, large bandwidth and, in principle, the ability to entangle the telecommunication wavelength of 1550 nm with any optical wavelength, making this approach highly relevant to emerging proposals for quantum communication and computing.