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Chinese Physics Letters

Optical Generation of Single- or Two-Mode Excited Entangled Coherent States

Ren Zhen-Zhong, Jing Rui, Xianzhou Zhang

Published Oct 1, 2008• 8 citations
Publisher

Abstract

With nonlinear Mach-Zehnder interferometer (NLMZI) and a type-I beta-barium borate (BBO) crystal, we optically generate single-mode excited entangled coherent states. This scheme can be easily generalized to generate two-mode excited entangled coherent states. We simply analyse different influences of single- and two-mode photon excitations on entangled coherent states.

DOI
10.1088/0256-307x/25/10/012

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With nonlinear Mach-Zehnder interferometer (NLMZI) and a type-I beta-barium borate (BBO) crystal, we optically generate single-mode excited entangled coherent states. This scheme can be easily generalized to generate two-mode excited entangled coherent states. We simply analyse different influences of single- and two-mode photon excitations on entangled coherent states.
We propose a feasible scheme based on the nonlinear Mach–Zehnder interferometer to realize the optical entanglement of a single-photon-added coherent state and show that, besides the Sanders entangled coherent state, the entangled single-photon-added coherent state also leads to new forms of hybrid entanglement of the quantum Fock state and the classical coherent state. We probe the essential difference between two types of hybrid entangled states. This hybrid entangled state provides a novel link between the discrete-variable and the continuous-variable entanglement in a natural way. Finally, we give a qualitative analysis of the losses in our scheme.
In this paper, after a brief review of the single-mode excited entangled coherent states, two new classes of continuous-variable entangled pure states, namely, single-mode nonlinear excited entangled coherent states, have been produced by using the f -deformed creation operator instead of . In order to establish the nonclassicality of the states, some of the physical properties of the corresponding entangled states, such as entanglement degree, photon statistics, second-order correlation function and quadrature squeezing have been studied in detail by choosing a particular f -deformation function. In addition, the influence of photon excitations on the properties of our introduced states has been analyzed and the results compared with those of a single-mode excited entangled coherent state. In continuation, a theoretical scheme for their generation based on the interaction of a two-level atom with a quantized cavity field has been proposed.
We present an optical design where polarization-entangled photon pairs are generated within two β\betaβ-Barium Borate crystals whose optical axes are parallel. This design increases the spatial mode overlap of the emitted photon pairs enhancing single mode collection without the need for additional spatial walk-off compensators. The observed photon pair rate is at least 65000 pairs/s/mW with a quantum state fidelity of 99.37±0.13%99.37\pm0.13\%99.37±0.13% when pumped with an elliptical spatial profile.