Low-Power Cross-Phase Modulation in a Metastable Xenon-Filled Cavity for Quantum Information Applications

TL;DR

This paper demonstrates a low-power cross-phase modulation system using metastable xenon in a high finesse cavity, promising for quantum information processing with minimal mirror contamination.

Contribution

It introduces a simple noble-gas-based system for low-power nonlinear optics, avoiding mirror contamination issues associated with alkali vapors.

Findings

Achieved 5 mrad cross-phase shifts with 4.5 fJ control pulses

Numerical models agree with experimental results

Predicted higher phase shifts with cavity size reduction

Abstract

Weak single-photon nonlinearities have many potential applications in quantum computing and quantum information. Here we demonstrate a relatively simple system for producing low-power cross-phase modulation using metastable xenon inside a high finesse cavity. The use of a noble gas such as xenon eliminates the contamination of the high-finesse mirrors that can occur when using alkali metal vapors such as rubidium. Cross-phase shifts of 5 mrad with 4.5 fJ control pulses were demonstrated. Numerical solutions of the master equation are in good agreement with the experimental results, and they predict that cross-phase shifts greater than 1 mrad per control photon should be achievable by reducing the size of the cavity.