Phys.org August 31, 2021
Researchers in China formulated a density matrix to fully describe two-photon state within a thermal light source in the photon orbital angular momentum (OAM) Hilbert space. They proved the separability, i.e., zero entanglement of the thermal two-photon state. Still, they revealed the hidden quantum correlations in terms of geometric measures of discord. By mimicking the original protocol of quantum teleportation, they demonstrated that the non-zero quantum discord can be utilized to transmit a high-dimensional OAM state at the single-photon level. It was found that the information of all parameters that characterize the original state can still be extracted from the teleported one. They also demonstrated that the multiple repetitions of the protocol, enable the transmission of a complex-amplitude light field, e.g., an optical image, regardless of being accompanied with a featureless background. Thus, they distinguished the scheme of optical image transmission from that of ghost imaging…read more. Open Access TECHNICAL ARTICLEÂ
The proposed experimental setup. Credit: Light: Science & Applications volume 10, Article number: 148 (2021)Â