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arXiv 1111.0676quant-ph
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光在波导中存储后的纯量子态的条件探测

Conditional detection of pure quantum states of light after storage in a waveguide

Erhan Saglamyurek, Neil Sinclair, Jeongwan Jin, Joshua A. Slater, Daniel Oblak, Félix Bussières, Mathew George, Raimund Ricken, Wolfgang Sohler, Wolfgang Tittel

摘要:

条件检测是从噪声背景中提取微弱信号的重要工具,与量子网络中的长距离量子通信和分布式量子信息处理协议中的预言密切相关。在这里,我们展示了有条件检测的时间仓量子比特存储和检索后,从光子回波的波导量子存储器。每个量子比特被编码到通过自发参数下转换产生的光子对的一个成员中,并且通过检测该对的另一个成员来实现调节。执行投影测量与存储和检索到不同的基础上的光子,我们得到的平均存储保真度为0.885 \pm 0.020,这超过了相关的经典界限,并显示了我们的集成光-物质接口的适用性,为未来的应用程序的量子信息处理。

英文摘要:

Conditional detection is an important tool to extract weak signals from a noisy background and is closely linked to heralding, which is an essential component of protocols for long distance quantum communication and distributed quantum information processing in quantum networks. Here we demonstrate the conditional detection of time-bin qubits after storage in and retrieval from a photon-echo based waveguide quantum memory. Each qubit is encoded into one member of a photon-pair produced via spontaneous parametric down conversion, and the conditioning is achieved by the detection of the other member of the pair. Performing projection measurements with the stored and retrieved photons onto different bases we obtain an average storage fidelity of 0.885 \pm 0.020, which exceeds the relevant classical bounds and shows the suitability of our integrated light-matter interface for future applications of quantum information processing.

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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