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The secure transfer of information is critical to the ever-increasing demands of the digital world. Continuous-variable quantum key distribution (CV-QKD) is a promising technology that can provide high secret key rates over metropolitan areas, using conventional telecom components. In this study, we demonstrate the utilization of CV-QKD over a 15 km multi-core fiber (MCF), in which we take advantage of one core to remotely frequency lock Bob's local oscillator with Alice's transmitter. We also demonstrate the capacity of the MCF to boost the secret key rate by parallelizing CV-QKD across multiple cores. Our results indicate that MCFs are promising for the metropolitan deployment of QKD systems.

Photonic quantum information processing is a type of information processing based on the principles of quantum optics. Continuous-variable (CV) quantum information of photons underpins a variety of quantum sensing and communication applications. Various of these quantum applications involve the generation and distribution of the two-mode squeezed vacuum (TMSV) state photons. My research topics cover these important subjects and can be divided into three parts. First, Itheoretically proposed an integrated photonic platform for the generation of TMSV photons and experimentally fabricated the structure on the chip to successfully carry out these TMSV photons on the chip. This part is compatible with complementarymetal-oxide-semiconductor (CMOS) technology and paves the road of mass production of quantum integrated photonic platforms. Second, I theoretically proposed a CV quantum repeater architecture with the assistance of quantum error correction (QEC) and optical Gottesman-Kitaev-Perskill state to realize long-haul entanglement establishment with high fidelity. To prove its usefulness, I applied these protocols on three representative use cases for quantum communication and sensing. Once optical GKP states with sufficient squeezing become available, the proposed QR architecture will enable CV quantum states to be faithfully transmitted over unprecedented distances, thereby making a large stride forward in the development of quantum technology. Finally, I theoretically proposed a quantum-radar scheme by transmitting the pulse-compression microwave field for investigating the direction of a distant object with higher sensitivity than the classical counterpart. This work generalizes the previous results in quantum radar ranging in [Phys. Rev. Lett. 128, 010501 (2022)] towards a general quantum radar detection system capable of detecting various properties of targets.

We investigate the quantization of games in which the players can access to a continuous set of classical strategies, making use of continuous-variable quantum systems. For the particular case of the Cournot's duopoly, we find that, even though the two players both act as "selfishly" in the quantum game as they do in the classical game, they are found to virtually cooperate due to the quantum entanglement between them. We also find that the original Einstein-Podolksy-Rosen state contributes to the best profits that the two firms could ever attain. Moreover, we propose a practical experimental setup for the implementation of such quantum games. © 2002 Elsevier Science B.V. All rights reserved., info:eu-repo/semantics/published