Memory-Enhanced Noiseless Cross Phase Modulation

TL;DR

This paper demonstrates a method to enhance cross phase modulation between optical pulses using a gradient echo memory, with potential applications in quantum information processing involving single photons.

Contribution

The paper introduces a novel approach to achieve significant XPM at the single-photon level using a memory-based technique, combining experimental demonstration and theoretical analysis.

Findings

Experimental demonstration of XPM with a gradient echo memory

Theoretical and semi-classical simulations supporting feasibility

Proposed experimental scheme for large XPM at single photon level

Abstract

Using a gradient echo memory, we experimentally demonstrate cross phase modulation (XPM) between two optical pulses; one stored and one freely propagating through the memory medium. We explain how this idea can be extended to enable substantial nonlinear interaction between two single photons that are both stored in the memory. We present semi-classical and quantum simulations along with a proposed experimental scheme to demonstrate the feasibility of achieving large XPM at single photon level.