Aberration corrections for free-space optical communications in atmosphere turbulence using orbital angular momentum states

Zhao, Shengmei; Leach, Jonathan; Gong, Lei; Ding, Jianping; Zheng, Baoyu

doi:10.1364/oe.20.000452

Cited by 175 publications

(77 citation statements)

References 20 publications

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“…There have also been theoretical suggestions to recover lost entanglement 18 ; however, it is yet to be demonstrated experimentally. In the context of OAM modes, the decay of entanglement has been both predicted 19 and measured 20 for atmospheric turbulence as an environment, with some success in diminishing these effects [21][22][23] .…”

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confidence: 99%

Self-healing of quantum entanglement after an obstruction

et al. 2014

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Quantum entanglement between photon pairs is fragile and can easily be masked by losses in transmission path and noise in the detection system. When observing the quantum entanglement between the spatial states of photon pairs produced by parametric downconversion, the presence of an obstruction introduces losses that can mask the correlations associated with the entanglement. Here we show that we can overcome these losses by measuring in the Bessel basis, thus once again revealing the entanglement after propagation beyond the obstruction. We confirm that, for the entanglement of orbital angular momentum, measurement in the Bessel basis is more robust to these losses than measuring in the usually employed Laguerre-Gaussian basis. Our results show that appropriate choice of measurement basis can overcome some limitations of the transmission path, perhaps offering advantages in free-space quantum communication or quantum processing systems.

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confidence: 99%

Self-healing of quantum entanglement after an obstruction

et al. 2014

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“…4 shows how the PSNR values of the reconstructed image with and without RS error correction codes vary with the strength of atmosphere turbulence for four-level grayscale, eight-level grayscale and sixteen-level grayscale objects. According to the atmosphere turbulence model [22], the random phase screen caused by atmosphere turbulence is mainly determined by the constant of the index of refraction. Hence, we calculate the PSNR for various strength of the turbulent aberration.…”

Section: Numerical Resultsmentioning

confidence: 99%

“…As a beam propagates through AT, the beam will be scattered by refractive index inhomogeneities. We use the thin sheet phase screens model [22] to simulate the turbulence aberration. For convenience, we denote the phase aberration of AT by , where , and .…”

Section: A the Theoretical Analysis Of The Turbulence Influence On Hmentioning

confidence: 99%

Improving the Atmosphere Turbulence Tolerance in Holographic Ghost Imaging System by Channel Coding

Zhao

Wang

Gong

et al. 2013

J. Lightwave Technol.

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Atmospheric turbulence (AT) severely cuts down the image resolutions of holographic ghost imaging (HGI) since orbital angular momentum (OAM) entangled states are associated with the spatial distribution of wave-functions. In this paper, we investigate the method to improve AT tolerance in HGI system. Since Reed-Solomon (RS) codes are important non-binary error correction codes which have strong correcting ability against noise, we use RS codes to develop a RS-coded HGI scheme. In order to verify the improvement quantitatively, we compute and compare the Peak Signal-to-Noise ratio (PSNR) of the reconstructed image in HGI without and with RS codes. The numerical results show that PSNRs go down quickly with the increase of the strength of turbulence, and they are improved greatly by using RS codes. For different grayscale objects, the results show that the improvement by RS codes is enhanced with the increasing correction ability, but it does not work for the same object by enlarging its grayscale to suit for more errors.

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“…Such robustness appears at first glance counterintuitive, because the encoding involves the use of OAM, which is quite sensitive to all the above-mentioned spatial perturbations 37,38 (although significant progresses in pure OAMbased classical and quantum communication through the atmosphere have been recently reported [39][40][41] ). The main reason for such robustness is that the OAM spread induced by spatial-mode perturbations is neutralized by the polarization degree of freedom, which is in contrast very robust against those spatial-mode perturbations.…”

Section: Robustness Of Rotational-invariant Hybrid Qubitsmentioning

confidence: 99%

Complete experimental toolbox for alignment-free quantum communication

et al. 2012

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Quantum communication employs the counter-intuitive features of quantum physics for tasks that are impossible in the classical world. It is crucial for testing the foundations of quantum theory and promises to revolutionize information and communication technologies. However, to execute even the simplest quantum transmission, one must establish, and maintain, a shared reference frame. This introduces a considerable overhead in resources, particularly if the parties are in motion or rotating relative to each other. Here we experimentally show how to circumvent this problem with the transmission of quantum information encoded in rotationally invariant states of single photons. By developing a complete toolbox for the efficient encoding and decoding of quantum information in such photonic qubits, we demonstrate the feasibility of alignment-free quantum key-distribution, and perform proofof-principle demonstrations of alignment-free entanglement distribution and Bell-inequality violation. The scheme should find applications in fundamental tests of quantum mechanics and satellite-based quantum communication.

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Aberration corrections for free-space optical communications in atmosphere turbulence using orbital angular momentum states

Cited by 175 publications

References 20 publications

Self-healing of quantum entanglement after an obstruction

Self-healing of quantum entanglement after an obstruction

Improving the Atmosphere Turbulence Tolerance in Holographic Ghost Imaging System by Channel Coding

Complete experimental toolbox for alignment-free quantum communication

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