Weak-Light, Zero to -\pi Lossless Kerr-Phase Gate in Quantum-well System via Tunneling Interference Effect

TL;DR

This paper demonstrates a lossless Kerr-phase gate in a quantum well system using tunneling interference, achieving a complete -π phase shift of a weak light signal with potential applications in quantum information and telecommunications.

Contribution

The study introduces a novel Kerr-phase gate in semiconductor quantum wells leveraging tunneling interference to achieve lossless phase shifts.

Findings

Achieves -π phase shift at specific detuning

Eliminates absorption/amplification of probe field

Demonstrates complete 180° phase rotation via numerical simulations

Abstract

We examine a Kerr phase gate in a semiconductor quantum well structure based on the tunnelling interference effect. We show that there exist a specific signal field detuning, at which the absorption/amplification of the probe field will be eliminated with the increase of the tunnelling interference. Simultaneously, the probe field will acquire a -\pi phase shift at the exit of the medium. We demonstrate with numerical simulations that a complete 180^\circ phase rotation for the probe field at the exit of the medium is achieved, which may result in many applications in information science and telecommunication.