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
影响因子:
2.9
通讯作者:
Nori Franco
中科院分区:
文献类型:
--
作者:
Yu Zong-Wen;Hu Jia-Zhong;Miranowicz Adam;Nori Franco
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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