期刊
PHYSICAL REVIEW A
卷 93, 期 2, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevA.93.022301
关键词
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资金
- PDIS
- GIA
- APSA
- CREST of JST
- Czech Science Foundation [GA14-36681G]
- Australian Research Council [CE1101027]
- ALPS
- Grants-in-Aid for Scientific Research [26247066] Funding Source: KAKEN
- Australian Research Council [CE1101027] Funding Source: Australian Research Council
We present a concept of non-Gaussian measurement composed of a non-Gaussian ancillary state, linear optics, and adaptive heterodyne measurement, and on the basis of this we also propose a simple scheme of implementing a quantum cubic gate on a traveling light beam. In analysis of the cubic gate in the Heisenberg representation, we find that nonlinearity of the gate is independent from nonclassicality; the nonlinearity is generated solely by a classical nonlinear adaptive control in a measurement-and-feedforward process, while the nonclassicality is attached by the non-Gaussian ancilla that suppresses excess noise in the output. By exploiting the noise term as a figure of merit, we consider the optimum non-Gaussian ancilla that can be prepared within reach of current technologies and discuss performance of the gate. It is a crucial step towards experimental implementation of the quantum cubic gate.
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