Intracavity weak nonlinear phase shifts with single photon driving

TL;DR

This paper explores how a single photon pulse influences phase shifts in a Kerr nonlinear cavity, revealing intrinsic noise mechanisms affecting quantum phase gates and advancing understanding of photon-cavity interactions.

Contribution

It introduces a detailed analysis of phase noise caused by single photon emissions in a doubly resonant Kerr cavity, proposing implications for quantum phase gate design.

Findings

Intrinsic phase noise arises from random photon emission times.

Single photon driving induces measurable phase shifts.

Implications for weak nonlinearity quantum gates.

Abstract

We investigate a doubly resonant optical cavity containing a Kerr nonlinear medium that couples two modes by a cross phase modulation. One of these modes is driven by a single photon pulsed field, and the other mode is driven by a coherent state. We find an intrinsic phase noise mechanism for the cross phase shift on the coherent beam which can be attributed to the random emission times of single photons from the cavity. An application to a weak nonlinearity phase gate is discussed.