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Optics Letters

Tunneling-induced large cross-phase modulation in an asymmetric quantum well

Hui Sun, Yueping Niu, Ruxin Li, Shiqi Jin, Shangqing Gong

Published Aug 16, 2007• 67 citations
Publisher

Abstract

We propose an asymmetric double AlGaAs/GaAs quantum well structure with a common continuum to generate a large cross-phase modulation (XPM). It is found, owing to resonant tunneling, that a large XPM can be achieved with vanishing linear and two-photon absorptions.
DOI
10.1364/ol.32.002475

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A theoretical investigation is carried out into the cross phase modulation (XPM) in an asymmetric double AlGaAs/GaAs quantum wells structure with a common continuum.It is found that, combining resonant tunneling-induced transparency and constructive interference in the third-order Kerr effect, a giant XPM can be achieved with vanishing linear and nonlinear absorptions, accompanied by the velocities of the probe and signal fields being matched.Furthermore, this giant XPM could induce a π-phase shift at a single-photon level which is favorable for the applications in two-qubit quantum logic gates.
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