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Acta Physica Polonica A

Pulsed Nonlinear Coupler as an Effective Tool for the Bell-Like States Generation

Joanna K. Kalaga, M.W. Jarosik, Radosław Szczȩśniak, Thi Dung Nguyen, W. Leoński

Published Feb 1, 2019• 4 citations
Publisher

Abstract

We discuss a model consisting of two nonlinear oscillators, where a train of periodic ultrashort laser pulses excites one of them.We show that the system can behave as a two-qubit system and produce maximally entangled Bell states.Such generation is more effective than that for the system with continuous excitation.
DOI
10.12693/aphyspola.135.273

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Schemes for optical-state truncation of two cavity modes are analysed. The systems, referred to as the nonlinear quantum scissors devices, comprise two coupled nonlinear oscillators (Kerr nonlinear coupler) with one or two of them pumped by external classical fields. It is shown that the quantum evolution of the pumped couplers can be closed in a two-qubit Hilbert space spanned by vacuum and single-photon states only. Thus, the pumped couplers can behave as a two-qubit system. Analysis of time evolution of the quantum entanglement shows that Bell states can be generated. A possible implementation of the couplers is suggested in a pumped double-ring cavity with resonantly enhanced Kerr nonlinearities in an electromagnetically-induced transparency scheme. The fragility of the generated states and their entanglement due to the standard dissipation and phase damping are discussed by numerically solving two types of master equations.
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In this paper we consider a system with two nonlinear oscillators which are coupled via a nonlinear interaction.In order to excite the system, we use two external coherent fields.Two oscillators have different frequencies.It follows from numerical simulation that evolution of the system is similar to that of a combination of n-photon states.Therefore, the considered system behaves as so-called nonlinear quantum scissor.Nevertheless, evolution of the system generates Bell-like states in several times with very high probability.Because of the nonlinear properties of oscillators and their interaction, the system creates a truncation of optical states, which leads to obtain two-qubit states.It will also be shown that these states appear several times in the qutrit-qutrit system.