Generation, characterization and use of atom-resonant indistinguishable photon pairs

TL;DR

This paper reports the generation and characterization of atom-resonant indistinguishable photon pairs using cavity-enhanced spontaneous parametric down-conversion and atomic filters, demonstrating their application in quantum-enhanced atomic sensing.

Contribution

It introduces a novel method for producing and spectral purification of atom-resonant photon pairs with applications in quantum sensing.

Findings

Successful generation of narrow-band photon pairs resonant with rubidium D1 line

Demonstration of high-visibility super-resolving interference

Implementation of quantum-enhanced atomic sensing using photon pairs

Abstract

We describe the generation of atom-resonant indistinguishable photon pairs using nonlinear optical techniques, their spectral purification using atomic filters, characterization using multi-photon interference, and application to quantum-enhanced sensing with atoms. Using either type-I or type-II cavity-enhanced spontaneous parametric down-conversion, we generate pairs of photons in the resonant modes of optical cavities with linewidths comparable to the 6 MHz natural linewidth of the D$_1$ line of atomic rubidium. The cavities and pump lasers are tuned so that emission occurs in a mode or a pair of orthogonally-polarized modes that are resonant to the D$_1$ line, at 794.7 nm. The emission from these frequency-degenerate modes is separated from other cavity emission using ultra-narrow atomic frequency filters, either a Faraday anomalous dispersion optical filter (FADOF) with a 445MHz linewidth and 57 dB of out-of-band rejection or an induced dichroism filter with an 80 MHz linewidth and $\ge$35dB out-of-band rejection. Using the type-I source, we demonstrate interference of photon pair amplitudes against a coherent state and a new method for full characterization of the temporal wave-function of narrow-band photon pairs. With the type-II source we demonstrate high-visibility super-resolving interference, a high-fidelity atom-tuned NooN state, and quantum enhanced sensing of atoms using indistinguishable photon pairs.