Quantum walks and wavepacket dynamics on a lattice with twisted photons
Filippo Cardano,Francesco Massa,Hammam Qassim,Ebrahim Karimi,Sergei Slussarenko,Domenico Paparo,Corrado de Lisio,Fabio Sciarrino,Enrico Santamato,Robert W. Boyd,Lorenzo Marrucci +10 more
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TLDR
In this paper, a photonic implementation of the quantum walk in the orbital angular momentum space of light is presented, where the whole process develops in a single light beam, with no need of interferometers, and it requires optical resources scaling linearly with the number of steps.Abstract:
The “quantum walk” has emerged recently as a paradigmatic process for the dynamic simulation of complex quantum systems, entanglement production and quantum computation. Hitherto, photonic implementations of quantum walks have mainly been based on multipath interferometric schemes in real space. We report the experimental realization of a discrete quantum walk taking place in the orbital angular momentum space of light, both for a single photon and for two simultaneous photons. In contrast to previous implementations, the whole process develops in a single light beam, with no need of interferometers; it requires optical resources scaling linearly with the number of steps; and it allows flexible control of input and output superposition states. Exploiting the latter property, we explored the system band structure in momentum space and the associated spin-orbit topological features by simulating the quantum dynamics of Gaussian wavepackets. Our demonstration introduces a novel versatile photonic platform for quantum simulations.read more
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Topological Photonics
Tomoki Ozawa,Hannah M. Price,Alberto Amo,Nathan Goldman,Mohammad Hafezi,Ling Lu,Mikael C. Rechtsman,David Schuster,Jonathan Simon,Oded Zilberberg,Iacopo Carusotto +10 more
TL;DR: Topological photonics is a rapidly emerging field of research in which geometrical and topological ideas are exploited to design and control the behavior of light as mentioned in this paper, which holds great promise for applications.
Journal ArticleDOI
Twisted photons: new quantum perspectives in high dimensions
TL;DR: In this paper, a review of the theoretical differences between qubits and higher dimensional systems, qudits, in different quantum information scenarios is given. And the authors consider the advantages of such higher-dimensional systems, which include higher information capacity and greater protection from eavesdropping.
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Photonic quantum information processing: a review
TL;DR: A comprehensive review of the state of the art in this active field, with a due balance between theoretical, experimental and technological results, can be found in this article, where significant achievements are presented in tables or in schematic figures, in order to convey a global perspective of the several horizons that fall under the name of photonic quantum information.
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High-dimensional intracity quantum cryptography with structured photons
Alicia Sit,Frédéric Bouchard,Robert Fickler,Jérémie Gagnon-Bischoff,Hugo Larocque,Khabat Heshami,Dominique Elser,Christian Peuntinger,Kevin Günthner,Bettina Heim,Christoph Marquardt,Gerd Leuchs,Robert W. Boyd,Ebrahim Karimi +13 more
TL;DR: It is demonstrated that, even through moderate turbulence without active wavefront correction, high-dimensional photon states are advantageous for securely transmitting more information, opening the way for intracity high- dimensional quantum communications under realistic conditions.
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Twisted Photons: New Quantum Perspectives in High Dimensions
TL;DR: This review article gives a brief overview of the theoretical differences between qubits and higher dimensional systems, qudits, in different quantum information scenarios and describes recent experimental developments in this field over the past three years.
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