Unity-Efficiency Parametric Down-Conversion via Amplitude Amplification
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PhysRevLett.118.123601.pdf
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Author(s)
Sanders, Barry C.
Niu, Yuezhen
Wong, Ngai Chuen
Shapiro, Jeffrey H
Date Issued
March 2017
Journal
Physical Review Letters
Publisher
American Physical Society
Citation
Niu, Murphy Yuezhen; Sanders, Barry C.; Wong, Franco N. C. and Shapiro, Jeffrey H. "Unity-Efficiency Parametric Down-Conversion via Amplitude Amplification." Physical Review Letters 118, no. 123601 (March 2017): 1-6 © 2017 American Physical Society
Version
Final published version
Abstract
We propose an optical scheme, employing optical parametric down-converters interlaced with nonlinear sign gates (NSGs), that completely converts an n-photon Fock-state pump to n signal-idler photon pairs when the down-converters’ crystal lengths are chosen appropriately. The proof of this assertion relies on amplitude amplification, analogous to that employed in Grover search, applied to the full quantum dynamics of single-mode parametric down-conversion. When we require that all Grover iterations use the same crystal, and account for potential experimental limitations on crystal-length precision, our optimized conversion efficiencies reach unity for 1≤n≤5, after which they decrease monotonically for n values up to 50, which is the upper limit of our numerical dynamics evaluations. Nevertheless, our conversion efficiencies remain higher than those for a conventional (no NSGs) down-converter.
MIT Department
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/PhysRevLett.118.123601
