Journal ArticleDOI
Entanglement evolution of twisted photons in strong atmospheric turbulence
TLDR
In this paper, an analytical solution for the dynamical equation (an infinitesimal propagation equation) that describes the evolution of the quantum state of a pair of entangled photons in a turbulent atmosphere and using the quadratic approximation to the Kolmogorov model of turbulence was provided.Abstract:
Considering the evolution of the quantum state of a pair of entangled photons in a turbulent atmosphere and using the quadratic approximation to the Kolmogorov model of turbulence, we provide an analytical solution for the dynamical equation (an infinitesimal propagation equation) that describes this evolution in the plane-wave basis. As such, this solution fully incorporates the effect of multiple scattering, caused by the medium. After being converted into a discrete orbital angular momentum (OAM) basis, this solution retains the effect of coupling between different OAM modes on the twin-photon state for arbitrary propagation distances and arbitrary turbulence strengths. We define a minimal set of parameters that determines the entanglement evolution in the regime of strong scintillation. Furthermore, we show that in the limit of weak scintillation, our solutions reduce to those obtained from the single-phase-screen model.read more
Citations
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Proceedings Article
Quantum communication
Nicolas Gisin,Hugo Zbinden +1 more
TL;DR: World specialists will talk about reliability tests in quantum networks; about quantum hacking, its importance and limitations, and its role in classical and quantum cryptography; about high rate and about low cost QKD systems; about free space quantum communication; and about future quantum repeaters for continental scale quantum communication.
Journal ArticleDOI
Twisted light transmission over 143 km.
Mario Krenn,Mario Krenn,Johannes Handsteiner,Johannes Handsteiner,Matthias Fink,Robert Fickler,Rupert Ursin,Mehul Malik,Mehul Malik,Anton Zeilinger,Anton Zeilinger +10 more
TL;DR: The transmission of orbital angular momentum modes of light over a distance of 143 km between two Canary Islands is shown, indicating that with state-of-the-art adaptive optics systems, both classical communication and entanglement transmission is feasible over distances of more than 100 km.
Journal ArticleDOI
Characterizing quantum channels with non-separable states of classical light
Bienvenu Ndagano,Benjamin Perez-Garcia,Benjamin Perez-Garcia,Filippus S. Roux,Melanie McLaren,Carmelo Rosales-Guzmán,Yingwen Zhang,Yingwen Zhang,Othmane Mouane,Raul I. Hernandez-Aranda,Thomas Konrad,Andrew Forbes +11 more
TL;DR: In this article, it was shown that the state evolution of classically entangled degrees of freedom is equivalent to that of quantum entangled photons, thus providing new physical insights into the notion of classical entanglement.
Posted Content
Transport of Orbital-Angular-Momentum Entanglement through a Turbulent Atmosphere
TL;DR: In this article, the authors demonstrate how orbital-angular-momentum entanglement of two photons evolves under influence of atmospheric turbulence and find that the quantum channel capacity is surprisingly robust: its typical horizontal decay distance is of the order of 2 kilometers, demonstrating the potential of photonic orbital angular momentum for free-space quantum communication in a metropolitan environment.
Journal ArticleDOI
Structured Light in Turbulence
TL;DR: A review of recent progress in structured light in turbulence, first with a tutorial style summary of the core concepts, before highlighting the present state of the art in the field, and with new experimental studies that reveal which types of structured light are best in turbulence.
References
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Journal ArticleDOI
Orbital angular momentum of light and the transformation of Laguerre-Gaussian laser modes.
TL;DR: Laser light with a Laguerre-Gaussian amplitude distribution is found to have a well-defined orbital angular momentum and an astigmatic optical system may be used to transform a high-order LaguERre- Gaussian mode into aHigh-order Hermite-Gaussia mode reversibly.
Journal ArticleDOI
Entanglement of Formation of an Arbitrary State of Two Qubits
TL;DR: In this article, an explicit formula for the entanglement of formation of a pair of binary quantum objects (qubits) as a function of their density matrix was conjectured.
Journal ArticleDOI
Orbital angular momentum: origins, behavior and applications
Alison M. Yao,Miles J. Padgett +1 more
TL;DR: In this paper, it was shown that if every polarization vector rotates, the light has spin; if the phase structure rotates and if a light has orbital angular momentum (OAM), the light can be many times greater than the spin.
Journal ArticleDOI
Free-space information transfer using light beams carrying orbital angular momentum
Graham M. Gibson,Johannes Courtial,Miles J. Padgett,Mikhail V. Vasnetsov,V. A. Pas’ko,Stephen M. Barnett,Sonja Franke-Arnold +6 more
TL;DR: The transfer of information encoded as orbital angular momentum states of a light beam is demonstrated, which is resistant to eavesdropping and gives an experimental insight into the effects of aperturing and misalignment of the beam on the OAM measurement and demonstrates the uncertainty relationship for OAM.
Journal ArticleDOI
Optical Resolution Through a Randomly Inhomogeneous Medium for Very Long and Very Short Exposures
TL;DR: In this article, the average resolution of very-long and very-short-exposure images is studied in terms of the phase and log-amplitude structure functions, whose sum is called the wave-structure function.