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arXiv quant-ph/0308054quant-ph
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用于量子信息处理的高效率光子数检测

High Efficiency Photon Number Detection for Quantum Information Processing

Edo Waks, Kyo Inoue, Eleni Diamanti, Yoshihisa Yamamoto

摘要:

可见光光子计数器(VLPC)具有高量子效率和低脉冲高度色散的特点。这些特性使其成为有效光子数态探测的理想选择。执行有效光子数态检测的能力在许多量子信息处理应用中是重要的,包括最近提出的利用线性光学元件执行量子计算的建议。在本文中,我们调查的VLPC的独特功能。探测器和低温系统的效率在543 nm波长处被测量为85%。然后使用皮秒脉冲激光器以具有范围从3-5的平均光子数的脉冲来激发检测器。VLPC的输出被用来区分脉冲中的光子数。由于倍增噪声的积累,数态鉴别的误差概率是光子数的增函数。这对VLPC进行数字状态检测的能力施加了最终限制。对于许多应用,区分1个和多于一个探测到的光子就足够了。VLPC可以以99%的准确度做到这一点。

英文摘要:

The Visible Light Photon Counter (VLPC) features high quantum efficiency and low pulse height dispersion. These properties make it ideal for efficient photon number state detection. The ability to perform efficient photon number state detection is important in many quantum information processing applications, including recent proposals for performing quantum computation with linear optical elements. In this paper we investigate the unique capabilities of the VLPC. The efficiency of the detector and cryogenic system is measured at 543nm wavelengths to be 85%. A picosecond pulsed laser is then used to excite the detector with pulses having average photon numbers ranging from 3-5. The output of the VLPC is used to discriminate photon numbers in a pulse. The error probability for number state discrimination is an increasing function of the number of photons, due to buildup of multiplication noise. This puts an ultimate limit on the ability of the VLPC to do number state detection. For many applications, it is sufficient to discriminate between 1 and more than one detected photon. The VLPC can do this with 99% accuracy.

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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