Efficient tomography of quantum-optical Gaussian processes probed with a few coherent states

Efficient tomography of quantum-optical Gaussian processes probed with a few coherent states
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用一些相干态探测量子光学高斯过程的高效层析成像

DOI:
10.1103/physreva.88.022101
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发表时间:
2013-04
期刊:
影响因子:
2.9
通讯作者:
Nori Franco
Nori Franco
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Yu Zong-Wen;Hu Jia-Zhong;Miranowicz Adam;Nori Franco

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任意量子光学过程(通道)可以通过使用最近开发的相干态量子过程层析成像(QPT)用相干态探测它来完全表征[Lobino等人,Science 322,563(2008)]。一般来说,精确的QPT是可能的,如果一组无限的探头是可用的。因此,现实的QPT无限维系统是近似的,由于有限的实验可行的相干态集及其相关的能量截止近似。我们用显式公式表明,人们可以完全确定一个量子光学高斯过程,只需几个不同的相干态,而无需近似的能量截止。对于多模过程的层析成像,与现有方法相比,我们的方法以指数方式减少了不同测试状态的数量。
An arbitrary quantum-optical process (channel) can be completely characterized by probing it with coherent states using the recently developed coherent-state quantum process tomography (QPT) [Lobino et al., Science 322, 563 (2008)]. In general, precise QPT is possible if an infinite set of probes is available. Thus, realistic QPT of infinite-dimensional systems is approximate due to a finite experimentally feasible set of coherent states and its related energy-cutoff approximation. We show with explicit formulas that one can completely identify a quantum-optical Gaussian process just with a few different coherent states without approximations like the energy cutoff. For tomography of multimode processes, our method exponentially reduces the number of different test states, compared with existing methods.
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