2017/05/31 by Isaac Nape, Charlotte Kyeremah, Adam Vallés +4
Computer Science · Mathematics · Physics and Astronomy · #Angular momentum #Channel (broadcasting) #Computer science #Encoding (memory) #Fiber #Interferometry #Mathematics #Optics #Orbital Angular Momentum in Optics #Physics #Quantum #Quantum Information and Cryptography #Quantum Mechanics and Applications #Quantum channel #Quantum entanglement #Quantum information #Quantum information science #Quantum mechanics #Telecommunications #Topology (electrical circuits) #physics.optics #quant-ph
paper · pdf · doi:10.1016/j.optcom.2017.06.084
Published version, 6 pages, 5 figures
openalex publication_date 2017/07/15 · openalex created_date 2017/07/21 · arxiv created 2017/07/24 · arxiv updated 2017/07/25 · openalex updated_date 2026/08/05
We demonstrate a simple projective measurement based on the quantum eraser concept that can be used to characterize the disturbances of any communication channel. Quantum erasers are commonly implemented as spatially separated path interferometric schemes. Here we exploit the advantages of redefining the which-path information in terms of spatial modes, replacing physical paths with abstract paths of orbital angular momentum (OAM). Remarkably, vector modes (natural modes of free-space and fiber) have a non-separable feature of spin-orbit coupled states, equivalent to the description of two independently marked paths. We explore the effects of fiber perturbations by probing a step-index optical fiber channel with a vector mode, relevant to high-order spatial mode encoding of information for ultra-fast fiber communications.