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Controlling correlations of paired photons for fundamental physics and applications in quantum imaging and generation of heralded single photons

Omar Calderón Losada

Published Jan 1, 2019• 0 citations
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The interaction between single or a fixed number of photons with a single absorber is of fundamental interest in quantum technology. The harnessing of light matter interactions at the single particle limit has several potential applications ranging from quantum communication and quantum metrology to quantum imaging. In this letter, a setup for heralded two-photon absorption at the single absorber level is proposed. The setup is based on a heralded two-photon source utilizing spontaneous parametric down-conversion, entanglement swapping and sum frequency generation for joint detection. The feasibility of the scheme is discussed by reviewing recent achievements in utilizing entangled and correlated photons for two-photon absorption as well as single photon absorption experiments at the limit of single absorbers in the context of applications in imaging (here mainly microscopy) and spectroscopy.
Spontaneous parametric down-conversion heralded single photon pairs (HSPS) are utilized in quantum key distribution (QKD) and quantum imaging (QI) experiments. Decoy state methods enhance security in these fields. HSPS is well-suited for integrating QKD protocols, reducing measurement uncertainty, and ensuring secure quantum imaging. This study examines the performance of the HSPS-decoy state method for quantum imaging under various conditions, focusing on secure key rate and Quantum Bit Error Rate (QBER) for free space applications. We specifically investigate the HSPS within the BB84 decoy state protocol for secure quantum imaging in free space. The dark count rate significantly impacts QBER, affecting the maximum tolerable loss. Low-efficiency, low-noise detectors can outperform high-efficiency, high-noise detectors, highlighting the importance of minimizing dark counts for optimal system performance.