Enhancing the stimulated emission of polarization-entangled photons using passive optical components
Ryo Nozaki, Yoshiro Sato, Yoshitaka Shimada, Taku Suzuki, Kei Yasuno, Yuta Ikai, Wataru Ueda, Kaito Shimizu, Emi Yukawa, Kaoru Sanaka · Physical Review A · 2023
Bright sources of polarization-entangled photon pairs are essential components for quantum information technologies. In many methods proposed so far, it is necessary to introduce a resonator that combines active optical components, such as an electric optical modulator to enhance the stimulated emission of polarization-entangled photons. In these methods, however; it is technically difficult to perform the time-series operation to output the stimulated entangled photons in the resonator by synchronizing laser pulses. In this paper, we propose a scheme to scale up the stimulated emission of polarization-entangled photon pairs using a resonator with only passive optical components. We show the theoretical aspects of the scheme and perform a proof-of-principle experimental demonstration of the scheme in a double-pass configuration.