2021/09/17 by Amy Rouillard, Tanita Permaul, Rouillard, Amy +5
Computer Science · Physics and Astronomy · #FOS: Physical sciences #Orbital Angular Momentum in Optics #Quantum Information and Cryptography #Quantum Physics (quant-ph) #Quantum optics and atomic interactions #quant-ph
paper · pdf · doi:10.48550/arxiv.2109.08641
13 pages, 6 figures
arxiv created 2021/09/17 · openalex publication_date 2021/09/17 · arxiv updated 2021/09/20 · openalex created_date 2022/07/25 · openalex updated_date 2026/07/28
We propose a class of preparation schemes for orbital angular momentum and polarisation qubits carried by single photons or classical states of light based on coherent feedback control by an ancillary degree of freedom of light. The preparation methods use linear optics and include the transcription of an arbitrary polarisation state onto a two-level OAM system (swap) for arbitrary OAM values plus/minus "l" within a light beam, i.e. without spatial interferometer. The preparations can be carried out with unit efficiency independent from the potentially unknown initial state of the system. Moreover, we show how to translate measurement-based qubit control channels into coherent feedback schemes for optical implementation.