Deterministic generation of large-scale hyperentanglement in three degrees of freedom

Abstract

Entanglement serves as a fundamental resource for quantum information protocols, and hyperentanglement has received an increasing amount of attention for its high-capacity characteristic. Increasing the scale of hyperentanglement, i.e., the number of modes in a hyperentangled system, is crucial for enhancing its capability in quantum information processing. Here, we demonstrate the generation of large-scale continuous-variable (CV) hyperentanglement in three degrees of freedom (DOFs), including azimuthal and radial indices of Laguerre-Gaussian (LG) modes and frequency. In our experiment, 216 pairs of hyperentangled modes are deterministically generated from the four-wave mixing process in an atomic vapor. In addition, we show that the entanglement between coherent LG superposition modes denoted by both azimuthal and radial quantum numbers can also be generated from this system. Such large-scale CV hyperentanglement in three DOFs presents an efficient scheme to significantly increase the information capacity of the CV system. Our results provide a new platform for studying CV quantum information and open the avenue for constructing high-capacity parallel and multiple-DOF CV quantum information protocols.

Hyperentanglement goes deterministic and large-scale

“…As reported recently in Advanced Photonics Nexus , 8 a group led by Jietai Jing from East China Normal University experimentally realized the deterministic generation of large-scale CV hyperentanglement. Their scheme utilizes a third-order nonlinear process, four-wave mixing (FWM) in an atomic vapor, to generate quantum correlated twin beams, each of which contains a number of optical modes defined by multiple optical DoFs.…”

Complete analysis of hyperentangled Bell state in three degrees of freedom using Kerr effect and self-assisted mechanism

“…Compared with the traditional hyperentangled state in two DOFs, hyperentanglement in three DOFs can largely increase the channel capacity of quantum communication, which has already been efficiently prepared and manipulated in experiments [46][47][48][49]. In 2009, a six-qubit hyperentangled Bell state was realized by entangling two photons in three different DOFs, including the polarization DOF and two longitudinal momentum DOFs [47].…”

Entanglement of Six Orbital Angular Momentum Modes with Reconfigurable Topological Charges

“…It is well known that propagating light beams can carry both spin angular momentum (SAM) [26,27] and orbital angular momentum (OAM). [28][29][30][31][32][33][34][35][36][37][38][39][40][41][42][43] The SAM is associated with polarization, while the OAM is associated with the phase of the complex electric field. Different from the SAM, the OAM of light has infinite number of possible optical modes in principle.…”