arXivDaily arXiv每日学术速递 周一至周五更新
arXiv周末暂无论文更新,休息一下吧,周末愉快~~
arXiv 0812.1626quant-ph
收藏

利用光子加减产生相干态的"压缩"叠加态

Generating "squeezed" superpositions of coherent states using photon addition and subtraction

P. Marek, H. Jeong, M. S. Kim

摘要:

研究了如何利用光子加法和减法在高相干度、大振幅的自由传播光场中产生相干态的压缩叠加。它示出,任意的$N$-光子减法的结果在生成的SSCS与几乎完美的保真度($F>0.999$),无论减去的光子的数量。在这种情况下,SSCS的幅度随着减去的光子的数量变大而增加。例如,从6.1dB的压缩真空态减去双光子可以产生$α=1.26$的SSCS,而在相同条件下,在四光子减法的情况下,获得更大幅度的SSCS $α=1.65$。当从压缩真空态中减去一个光子并随后加入另一个光子时,可以产生具有较低保真度($F\approx 0.96$)但具有较高振幅($α\approx2$)的SSCS。我们分析了一些实验上的缺陷,包括用于光子减法的探测器的效率低下。

英文摘要:

We study how photon addition and subtraction can be used to generate squeezed superpositions of coherent states in free-traveling fields (SSCSs) with high fidelities and large amplitudes. It is shown that an arbitrary $N$-photon subtraction results in the generation of a SSCS with nearly the perfect fidelity ($F>0.999$) regardless of the number of photons subtracted. In this case, the amplitude of the SSCS increases as the number of the subtracted photons gets larger. For example, two-photon subtraction from a squeezed vacuum state of 6.1dB can generate a SSCS of $α=1.26$, while in the case of the four-photon subtraction a SSCS of a larger amplitude $α=1.65$ is obtained under the same condition. When a photon is subtracted from a squeezed vacuum state and another photon is added subsequently, a SSCS with a lower fidelity ($F\approx 0.96$) yet higher amplitude ($α\approx2$) can be generated. We analyze some experimental imperfections including inefficiency of the detector used for the photon subtraction.

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。

↑