论文标题
纠缠辅助纠缠净化
Entanglement-assisted entanglement purification
论文作者
论文摘要
高保真纠缠状态的有效产生是长距离量子通信，量子计算和其他量子技术的关键要素，同时在许多方案中最耗资最多的部分。我们提出了一类新的纠缠纠缠净化协议，与以前的方法相比，可以从嘈杂，有限尺寸的合奏中产生高保真纠缠。该方案利用高维辅助纠缠来执行纠缠非本地测量，并以控制和有效的方式确定集合中错误的数量和位置，而不会扰乱良好对的纠缠。我们的协议可以处理任意错误，但最适合几个错误，并且特别适合衰减噪声。我们的方法适用于中等大小的合奏，对于近期量子设备非常重要。
The efficient generation of high-fidelity entangled states is the key element for long-distance quantum communication, quantum computation and other quantum technologies, and at the same time the most resource-consuming part in many schemes. We present a new class of entanglement-assisted entanglement purification protocols that can generate high-fidelity entanglement from noisy, finite-size ensembles with improved yield and fidelity as compared to previous approaches. The scheme utilizes high-dimensional auxiliary entanglement to perform entangling non-local measurements and determine the number and positions of errors in an ensemble in a controlled and efficient way, without disturbing the entanglement of good pairs. Our protocols can deal with arbitrary errors, but are best suited for few errors, and work particularly well for decay noise. Our methods are applicable to moderate sized ensembles, as will be important for near term quantum devices.
