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arXiv:1410.0663 · Physical Review A

Phase-noise limitations on single-photon cross-phase modulation with differing group velocities

Justin Dove, Christopher Chudzicki, Jeffrey H. Shapiro

Published Dec 8, 2014• 25 citations
arXivHTMLPDF

Abstract

A continuous-time quantum theory for cross-phase modulation with differing group velocities has been presented and used to assess the feasibility of extending the fiber-switching technique to the single-photon regime for creating a CPHASE gate.
DOI
10.1103/physreva.90.062314

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Understanding the nature of single-photon propagation and any differences to the classical multi-photon regime is essential to better use the escalating number of single-photon technologies. Novel techniques and results are reported that demonstrate a consistent ability to measure the classical group velocity in an optical fiber to an accuracy in the time-offlight around ±0.2 ns in 30,000 ns. Identical techniques are then applied to single photons to determine their velocity and assess if there is any evidence that Schrödinger frequencies (N+1/2)ω alter the ω-k dispersion diagram. The evidence suggests that photons in a circular fiber show no additional dispersion but travel at the classical group velocity.