期刊
PHYSICAL REVIEW A
卷 105, 期 4, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevA.105.043713
关键词
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资金
- National Natural Sci-ence Foundation of China [61903316, 6217023269]
- Shenzhen Fundamental Research Fund [JCYJ20190813165207290]
- Hong Kong Research Grant council (RGC) [15203619, 15208418, 15506619]
- Australian Research Council Centre of Excellence for Quantum Computation and Communication Technology [CE170100012]
In this paper, we propose and analyze a scheme to generate large-size Schrödinger cat states using linear operations of Fock states, squeezed vacuum states, and conditional measurements. By performing conditional measurements with photon number detectors, two unbalanced small-amplitude Schrödinger kitten states can be amplified to a large-size cat state with the same parity. Simulation results show that the proposed scheme achieves high fidelity for generating large-size cat states.
We proposed and analyzed a scheme to generate large-size Schr??dinger cat states based on linear operations of Fock states, squeezed vacuum states, and conditional measurements. By conducting conditional measurements via photon number detectors, two unbalanced small-amplitude Schr??dinger kitten states combined by a beam splitter can be amplified to a large-size cat state with the same parity. According to simulation results, two Schr??dinger odd kitten states with amplitudes of |??| = 1.06 and |??| = 1.11 generated from one-photonsubtracted 3 dB squeezed vacuum states, are amplified to an odd cat state of |??| = 1.73 with a fidelity of F = 99%. A large-size Schr??dinger odd cat state with |??| = 2.51 and F = 97.30% is predicted when 5.91 dB squeezed vacuum states are employed. According to the analysis on the impacts of experimental imperfections in practice, Schr??dinger odd cat states of |??| > 2 are available. A feasible configuration based on a quantum frequency comb is developed to realize the large-size cat state generation scheme we proposed.
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