https://doi.org/10.1140/epjd/e2013-30607-7
Regular Article
Conditional generation of Fock states and Schrödinger-cat states via adding multiple photons to a squeezed vacuum state
1 School of Mathematics and Physics, Changzhou University, Changzhou 213164, P.R. China
2 College of Optoelectronic Engineering, Changzhou Institute of Technology, Changzhou 213002, P.R. China
3 Department of Basic Courses, Wuxi Institute of Technology, Wuxi 214121, P.R. China
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e-mail: wangshuai197903@sohu.com
Received: 2 October 2012
Received in final form: 13 November 2012
Published online: 7 May 2013
We show that Fock states and Schrödinger-cat states can be conditionally generated by adding multiple photons to a squeezed vacuum state. To demonstrate this, we mainly investigate the photon-number distributions and the Wigner function of the multiple-photon-added squeezed vacuum state (MPASVS). We find that for small squeezing parameter r, the MPASVS approaches to the Fock state |m⟩, and the fidelity between the m-photon PASVS and the Fock state |m⟩ is close to 1. In terms of the fidelity between the MPASVS and the Schrödinger-cat state, as well as the Wigner function of the MPASVS, we show that the MPASVS is basically a Schrödinger-cat state with high fidelities and large amplitudes for the appropriate squeezing parameter.
Key words: Quantum Optics
© EDP Sciences, Società Italiana di Fisica and Springer-Verlag 2013
