Ultra-Large-Scale Deterministic Entanglement Containing 2? 20 400 Optical Modes Based on Time-Delayed Quantum Interferometer

Quantum entanglement is an indispensable resource for implementing quantum information processing. The scale of quantum entanglement directly determines its quantum information processing capability. Therefore, it is of great importance to generate ultra-large-scale (ULS) quantum entanglement for the development of quantum information science and technology. Many efforts have been made to increase the scale of quantum entanglement. Recently, time-domain multiplexing has been introduced into continuous -variable (CV) quantum systems to greatly enlarge the scale of quantum entanglement. In this Letter, based on a time-delayed quantum interferometer, we theoretically propose and experimentally demonstrate a scheme for generating an ULS CV deterministic entanglement containing 2 x 20 400 optical modes. In addition, such ULS entanglement contains 81 596 squeezed modes. Our results provide a new platform for implementing ULS CV quantum information processing.

Automated summary

Quantum entanglement is crucial for quantum information processing, and the scale of quantum entanglement directly affects its processing capability. Generating ultra-large-scale (ULS) quantum entanglement is of great importance for the development of quantum information science and technology. This study introduces time-domain multiplexing into continuous-variable quantum systems to significantly increase the scale of quantum entanglement. By using a time-delayed quantum interferometer, the researchers propose and demonstrate a scheme for generating ULS continuous-variable deterministic entanglement with 2 x 20 400 optical modes, including 81 596 squeezed modes. This provides a new platform for ULS continuous-variable quantum information processing.