Measuring the frequency-time two-photon wavefunction of narrowband entangled photons from cold atoms via stimulated emission

• DOI: 10.1364/optica.4.001293
• Publication Date: 2017-10-12T18:30:11Z
• Authors: Kwang-Kyoon Park; Jin-Hun Kim; Tian-Ming Zhao; Young-Wook Cho; Yoon-Ho Kim
• Keywords: Narrowband; Photon entanglement

Cold atom based narrowband entangled photon sources are important for efficient atom–photon interaction, which is at the heart of long-distance quantum communication and memory protocols. Complete characterization photons requires acquiring frequency-time two-photon wavefunction, involving both joint temporal intensity (JTI) phase (JTP) measurements. Here, we demonstrate stimulated emission tomography wavefunction from cold atoms. We show more than six orders magnitude (×106) improvement in measurement time obtaining JTI JTP compared to conventional direct counting method, thus paving way toward ultrafast high-resolution photonic states.