1. Efficient tomography of quantum-optical Gaussian processes probed with a few coherent states.
- Author
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Xiang-Bin Wang, Zong-Wen Yu, Jia-Zhong Hu, Miranowicz, Adam, and Nori, Franco
- Subjects
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QUANTUM optics , *GAUSSIAN processes , *TOMOGRAPHY , *NUCLEAR energy , *INFINITY (Mathematics) , *COHERENT states , *NUCLEAR physics experiments - Abstract
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. [ABSTRACT FROM AUTHOR]
- Published
- 2013
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