Unity-Efficiency Parametric Down-Conversion via Amplitude Amplification

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 $1\le n\le 5$, 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.

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Cited by in corpus (5)

• Introduction to the Absolute Brightness and Number Statistics in Spontaneous Parametric Down-Conversion
• Qudit-Basis Universal Quantum Computation using ${\chi }^{(2)}$ Interactions
• Engineering AlGaAs-on-insulator towards quantum optical applications
• Dependence of the photon statistics of down-converted field-modes on the photon statistics of pump field-mode
• Entanglement-Enhanced Lidars for Simultaneous Range and Velocity Measurements