High Speed Computational Ghost Imaging via Spatial Sweeping

Wang, Yuwang; Liu, Yang; Suo, Jinli; Situ, Guohai; Qiao, Chang; Dai, Qionghai

doi:10.1038/srep45325

Cited by 52 publications

(22 citation statements)

References 14 publications

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“…Ghost imaging (GI) is an imaging technique that generates the image of an object by calculating the second-order correlation function between two light beams [1][2][3][4][5][6]. Ghost imaging has been widely researched in recent years [7][8][9][10][11][12][13][14][15][16]; it has important applications in many fields such as cryptography [17,18], lidar [19,20], medical imaging [21,22], micro object imaging [23,24], three-dimensional imaging [25][26][27][28] and single-pixel imaging [29][30][31][32][33]. In many practical scenes, GI is subject to interference from the transmission medium and from optical background noise.…”

Section: Introductionmentioning

confidence: 99%

Instant ghost imaging: improving robustness for ghost imaging subject to optical background noise

Yang

Zhang

et al. 2020

OSA Continuum

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Ghost imaging (GI) is an imaging technique that uses the second-order correlation between two light beams to obtain the image of an object. However, standard GI is affected by optical background noise, which reduces its practical use. We investigated the robustness of an instant ghost imaging (IGI) algorithm against optical background noise and compare it with the conventional GI algorithm. Our results show that IGI is extremely resistant to spatiotemporally varying optical background noise that can change over a large range. When the noise is large in relation to the signal, IGI will still perform well in conditions that prevent the conventional GI algorithm from generating an image because IGI uses signal differences for imaging. Signal differences are intrinsically resistant to common noise modes, so the IGI algorithm is strongly robust against noise. This research is of great significance for the practical application of GI.

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Section: Introductionmentioning

confidence: 99%

Instant ghost imaging: improving robustness for ghost imaging subject to optical background noise

Yang

Zhang

et al. 2020

OSA Continuum

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“…Compressive sensing [36,37], a convex optimization procedure, reduces the required number of acquisitions for GI with good image quality [38][39][40]. However, it is at the cost of more computing resources, which increases the GI's dependence on the computer.…”

Section: Introductionmentioning

confidence: 99%

Instant ghost imaging: algorithm and on-chip implementation

Yang¹,

Zhang²,

Liu³

et al. 2020

Opt. Express

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Ghost imaging (GI) is an imaging technique that uses the correlation between two light beams to reconstruct the image of an object. Conventional GI algorithms require large memory space to store the measured data and perform complicated offline calculations, limiting practical applications of GI. Here we develop an instant ghost imaging (IGI) technique with a differential algorithm and an implemented high-speed on-chip IGI hardware system. This algorithm uses the signal between consecutive temporal measurements to reduce the memory requirements without degradation of image quality compared with conventional GI algorithms. The on-chip IGI system can immediately reconstruct the image once the measurement finishes; there is no need to rely on post-processing or offline reconstruction. This system can be developed into a realtime imaging system. These features make IGI a faster, cheaper, and more compact alternative to a conventional GI system and make it viable for practical applications of GI.

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“…With high-speed cameras or avalanche photodiode arrays, the limitation of the proposed method might be the speed at which phase masks can be changed. An ultrafast digital micromirror device can be used to encode patterns with a speed as high as 97 kHz [34]. Together with the high dimensionality of the used alphabet (HB = log2 36 = 5.2 bit per pulse) and unity wavefront shaping fidelity, it gives rise to a secure bit rate of up to 0.5 Mb/s.…”

Section: Discussionmentioning

confidence: 99%

Quantum key establishment via a multimode fiber

Amitonova¹,

Tentrup²,

Vellekoop³

et al. 2020

Opt. Express

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Quantum communication aims to provide absolutely secure transmission of secret information. State-of-the-art methods encode symbols into single photons or coherent light with much less than one photon on average. For long distance communication, typically a singlemode fiber is used and significant effort has been devoted already to increase the data carrying capacity of a single optical line. Here we propose and demonstrate a fundamentally new concept for remote key establishment. Our method allows high-dimensional alphabets using spatial degrees of freedom by transmitting information through a light-scrambling multimode fiber and exploiting the no-cloning theorem. Eavesdropper attacks can be detected without using randomly switched mutually unbiased bases. We prove the security with single-photon Fock states and with weak coherent light. Since it is optical fiber based, our method allows to naturally extend secure communication to larger distances. We experimentally demonstrate this new type of key exchange method by encoding information into a few-photon light pulse decomposed over guided modes of an easily available multimode fiber. dimensional QKD [8]. A step-index multimode (MM) fiber supports a significantly higher number of modes than a multicore fiber and as a result can transfer information at a higher density. Another method for secure communication relies on optical reciprocity in MM fibers scrambling wavefronts in a random way [9].Although short pieces of straight or slightly bent fiber are not truly random [10], in any realistic fiber random bends, index imperfections, and other perturbations cause the signal to couple into multiple modes [11], leading to an arbitrary mixing of field amplitudes [12] and scrambling the information across the modes. However, it is well-known that the mode mixing can be partially undone by applying techniques from complex wavefront shaping, a method originally developed for precise light control through and in highly scattering materials [13][14][15]. Recently methods have been proposed for high-speed [16], high-resolution [17,18] image transfer. Multimode optical fibers can now also be used to transmit information in the spatial domain [19][20][21]. However, these methods are not secure.Here we propose a new method for secure key establishment via a MM fiber. The idea is based on secure characterization of the multimode transmission channel by means of weak light pulses. As can be seen in Fig. 1, both the sender, Alice, and the receiver, Bob, control a stretch of fiber that is randomly bent so that it spatially scrambles the optical communication signal. Our method is designed such that: 1) Alice and Bob can characterize the scrambled communication channel in a calibration phase and undo the scrambling using complex wavefront shaping in the communication phase. 2) By merit of the no-cloning theorem, Eve cannot decode the signal without physically reproducing the exact configuration of the scramblers used by Alice and Bob. 3) By merit of the same theorem, Eve cannot det...

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High Speed Computational Ghost Imaging via Spatial Sweeping

Cited by 52 publications

References 14 publications

Instant ghost imaging: improving robustness for ghost imaging subject to optical background noise

Instant ghost imaging: improving robustness for ghost imaging subject to optical background noise

Instant ghost imaging: algorithm and on-chip implementation

Quantum key establishment via a multimode fiber

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