Qudits have proven to be a powerful resource for quantum information processing,offering enhanced channel capacities,improved robustness to noise,and highly efficient implementations of quantum algorithms.The encoding...Qudits have proven to be a powerful resource for quantum information processing,offering enhanced channel capacities,improved robustness to noise,and highly efficient implementations of quantum algorithms.The encoding of photonic qudits in transverse-spatial degrees of freedom has emerged as a versatile tool for quantum information processing,allowing access to a vast information capacity within a single photon.We examine recent advances in quantum optical circuits with spatially structured light,focusing particularly on top-down approaches that employ complex mode-mixing transformations in free space and fibers.We highlight circuits based on platforms such as multi-plane light conversion,complex scattering media,multi-mode,and multi-core fibers.We discuss their applications for the manipulation and measurement of multi-dimensional and multi-mode quantum states.Furthermore,we discuss how these circuits have been employed to perform multi-party operations and multi-outcome measurements,thereby opening new avenues for scalable photonic quantum information processing.展开更多
基金financial support from the European Research Council(ERC)Starting Grant PIQUaNT(Grant No.950402)the UK Engineering and Physical Sciences Research Council(EPSRC)(Grant Nos.EP/Z533208/1 and EP/W003252/1)the Royal Academy of Engineering Chair in Emerging Technologies programme(Grant No.CiET-2223-112)。
文摘Qudits have proven to be a powerful resource for quantum information processing,offering enhanced channel capacities,improved robustness to noise,and highly efficient implementations of quantum algorithms.The encoding of photonic qudits in transverse-spatial degrees of freedom has emerged as a versatile tool for quantum information processing,allowing access to a vast information capacity within a single photon.We examine recent advances in quantum optical circuits with spatially structured light,focusing particularly on top-down approaches that employ complex mode-mixing transformations in free space and fibers.We highlight circuits based on platforms such as multi-plane light conversion,complex scattering media,multi-mode,and multi-core fibers.We discuss their applications for the manipulation and measurement of multi-dimensional and multi-mode quantum states.Furthermore,we discuss how these circuits have been employed to perform multi-party operations and multi-outcome measurements,thereby opening new avenues for scalable photonic quantum information processing.
