Experimental Engineering of Arbitrary Qudit States with Discrete-Time Quantum Walks

Taira Giordani, Luca Innocenti, Mauro Paternostro, Alessandro Ferraro, Helena Majury, Emanuele Polino, Sabrina Emiliani, Alessia Suprano, Lorenzo Marrucci, Fabio Sciarrino, Nicolò Spagnolo

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Abstract

The capability to generate and manipulate quantum states in high-dimensional Hilbert spaces is a crucial step for the development of quantum technologies, from quantum communication to quantum computation.One-dimensional quantum walk dynamics represents a valid tool in the task of engineering arbitrary quantum states. Here we affirm such potential in a linear-optics platform that realizes discrete-time quantum walks in the orbital angular momentum degree of freedom of photons. Different classes of relevant qudit states in a six-dimensional space are prepared and measured, confirming the feasibility of the protocol. Our results represent a further investigation of quantum walk dynamics in photonics platforms, paving the way for the use of such a quantum state-engineering toolbox for a large range of applications.
Original languageEnglish
Pages (from-to)1-7
JournalPhysical Review Letters
DOIs
Publication statusPublished - 18 Jan 2019

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