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arXiv quant-ph/0602198quant-ph
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量子信息网络中奇光子数叠加态的产生

Generation of a superposition of odd photon number states for quantum information networks

J. S. Neergaard-Nielsen, B. Melholt Nielsen, C. Hettich, K. Moelmer, E. S. Polzik

摘要:

我们报告的实验观察到的量子网络兼容的光描述的非正维格纳函数。该态是由连续波光学参量放大器产生的压缩真空态通过光子相减产生的。理想情况下,该状态是奇光子数态的相干叠加,非常类似于弱相干态的叠加(薛定谔猫),在低参数增益限制下,单光子态的主要贡献。光产生在一个近乎完美的空间模式与傅立叶有限的频率带宽,以及原子量子存储器的要求相匹配。该源还具有高光谱亮度的特点,通常每秒产生约10,000个或更多的事件。光的生成态是测试量子存储器、量子中继器和线性光学量子计算机的最终输入态。

英文摘要:

We report on the experimental observation of quantum-network-compatible light described by a non-positive Wigner function. The state is generated by photon subtraction from a squeezed vacuum state produced by a continuous wave optical parametric amplifier. Ideally, the state is a coherent superposition of odd photon number states, closely resembling a superposition of weak coherent states (a Schroedinger cat), with the leading contribution from a single photon state in the low parametric gain limit. Light is generated in a nearly perfect spatial mode with a Fourier-limited frequency bandwidth which matches well atomic quantum memory requirements. The source is also characterized by high spectral brightness with about 10,000 and more events per second routinely generated. The generated state of light is the ultimate input state for testing quantum memories, quantum repeaters and linear optics quantum computers.

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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