Phase-noise limitations on single-photon cross-phase modulation with differing group velocities
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PhysRevA.90.062314.pdf
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446.57 KB
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Adobe PDF
Checksum (MD5)
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Author(s)
Shapiro, Jeffrey H.
Dove, Justin Michael
Chudzicki, Christopher Alan
Date Issued
December 2014
Journal
Physical Review A
Publisher
American Physical Society
Citation
Dove, Justin, Christopher Chudzicki, and Jeffrey H. Shapiro. "Phase-noise limitations on single-photon cross-phase modulation with differing group velocities." Phys. Rev. A 90, 062314 (December 2014). © 2014 American Physical Society
Version
Final published version
Abstract
A framework is established for evaluating cphase gates that use single-photon cross-phase modulation (XPM) originating from the Kerr nonlinearity. Prior work [J. H. Shapiro, Phys. Rev. A 73, 062305 (2006)], which assumed that the control and target pulses propagated at the same group velocity, showed that the causality-induced phase noise required by a noninstantaneous XPM response function precluded the possibility of high-fidelity π-radian conditional phase shifts. The framework presented herein incorporates the more realistic case of group-velocity disparity between the control and target pulses, as employed in existing XPM-based fiber-optical switches. Nevertheless, the causality-induced phase noise identified by Shapiro [J. H. Shapiro, Phys. Rev. A 73, 062305 (2006)P] still rules out high-fidelity π-radian conditional phase shifts. This is shown to be so for both a reasonable theoretical model for the XPM response function and for the experimentally measured XPM response function of silica-core fiber.
MIT Department
Massachusetts Institute of Technology. Department of Electrical Engineering and Computer Science
Massachusetts Institute of Technology. Department of Physics
Massachusetts Institute of Technology. Research Laboratory of Electronics
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DOI of Published Version
https://doi.org/10.1103/PhysRevA.90.062314
