Advancements in quantum information protocols using quantum optics

Robert W. Boyd

We explore the use of nonlinear optical methods for important applications in quantum information science. One example is the use nonlinear optical methods in the context of “quantum imaging.” We describe some of the conceptual possibilities afforded by the marriage of quantum and classical imaging methods, and we describe recent work that illustrates some of these features. We also address the complementary issue of how advanced imaging protocols can allow one to utilize and manipulate the enormous information content residing in the transvers structure of a quantum light field.

J. I. Cirac, L.-M. Duan, Dieter Jaksch +1 more

Nayda Guerrero

Quantum information protocols benefit from the use of technology commonly employed in telecommunications. In particular, optical fibers and the advancement of multi-core optical f iber technology enable an increase in transmission channels, thereby allowing for a higher data transfer rate with potential applications in quantum cryptography, quantum networks, and quantum-enhanced sensing. High-quality multi-core beam splitters based on a core manipulation scheme can be fab ricated with these fibers. Using 4 × 4 multi-core beam splitters we generate four-dimensional quantum systems and implement a measurement-device-independent random number generation task using a programmable four-arm interferometer operating at a 2 MHz repetition rate. Due to the high visibilities observed, we surpass the one-bit limit of binary protocols. Overall, this study paves the way for efficient and scalable high-dimensional quantum systems by leveraging multi-core optical fiber technology, significantly advancing the field of quantum information processing.

S. Ya. Kilin

Harry J. Kimble

Julien Laurat

To advance quantum information science and technologies, a wide variety of quantum machines and protocols are being developed based on different physical systems. Interconnecting these systems is a grand challenge to scale up quantum information architectures. This effort requires to develop specialized photonic devices and capabilities, ranging from efficient photon extraction for qubit connectivity to the implementation of advanced optical memories. In this talk, I will provide an overview of the opportunities presented by networking, including long-distance quantum communication and distributed quantum computing. I will also present our recent experimental demonstrations, which enable the realization of a quantum-bit-encoding converter, the implementation and use of highly-efficient quantum memories based on laser-cooled neutral atoms, and the development of nanophotonic devices for qubit coupling.