Quantum computing has long struggled to efficiently generate entangled photons, but a team of researchers has discovered a game-changing method by utilizing metasurfaces -- flat, engineered structures that control light. By exploiting these metasurfaces, they can generate and manipulate entangled photons more easily and compactly than ever before. The breakthrough could open the door to smaller, more powerful quantum computers and even pave the way for quantum networks that deliver entangled photons to multiple users.
Scientists have found a way to use metasurfaces to create entangled photons, simplifying quantum computing and communications. (Generating multiphoton entanglement with tiny metasurfaces).
Quantum information processing relies on the entanglement of multiple photons to process large amounts of data. However, how to efficiently create these entangled photons remains a major challenge. Traditional methods either use quantum nonlinear optical processes, which are difficult to extend to a large number of photons; or they use linear beam splitting and quantum interference, which require complex and delicate devices and are prone to loss and crosstalk.
Research teams from Peking University, Southern University of Science and Technology, and University of Science and Technology of China have recently made breakthroughs in this field. According to AdvancedPhotonicsNexus magazine, they have developed a new technology using metasurfaces - ultra-thin engineered structures that can precisely control the phase, frequency and polarization of light. This method can generate multi-photon entanglement on a single element surface, making the process simpler and more efficient.
Their method directs multiple single photons from different angles toward a specially designed gradient element surface. The metasurface manipulates these photons so that they interfere in a quantum manner, creating entangled photon states. This technology can not only generate various entangled states, but also fuse multiple entangled photon pairs into larger and more complex photon groups. Therefore, more quantum information can be encoded in a smaller space, potentially advancing the development of quantum computing and communication technologies.
Professor Gu Ying, the corresponding author of the report, believes that this new method provides a new perspective on quantum information processing: "It's like finding a shortcut in a maze. Instead of zigzagging in a complex optical device, we can use a meta-surface to do the job. The process of creating and manipulating entangled photons becomes simpler and more compact. It is very suitable for building tiny quantum devices that can be installed on a chip, and is an excellent solution for future quantum computing and communication applications."
With this new method of generating multiphoton entanglement, many quantum applications may become easier to achieve. For example, metasurfaces can be used to generate entangled photons and deliver them to multiple users, thereby facilitating the establishment of quantum networks. Additionally, metasurfaces could serve as building blocks for processing more photons, potentially making it possible to develop quantum computers as small as a laptop. The possibilities are exciting, and this study brings us one step closer to realizing them.
Compiled from /scitechdaily