MSGID: 1:317/3 647eb681   
   PID: hpt/lnx 1.9.0-cur 2019-01-08   
   TID: hpt/lnx 1.9.0-cur 2019-01-08   
    Researchers demonstrate secure information transfer using spatial   
   correlations in quantum entangled beams of light    
      
     Date:   
         June 5, 2023   
     Source:   
         University of Oklahoma   
     Summary:   
         Researchers have demonstrated the principle of using spatial   
         correlations in quantum entangled beams of light to encode   
         information and enable its secure transmission.   
      
      
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   FULL STORY   
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   Researchers at the University of Oklahoma led a study recently published   
   in Science Advancesthat proves the principle of using spatial correlations   
   in quantum entangled beams of light to encode information and enable   
   its secure transmission.   
      
   Light can be used to encode information for high-data rate transmission,   
   long- distance communication and more. But for secure communication,   
   encoding large amounts of information in light has additional challenges   
   to ensure the privacy and integrity of the data being transferred.   
      
   Alberto Marino, the Ted S. Webb Presidential Professor in the Homer   
   L. Dodge College of Arts, led the research with OU doctoral student and   
   the study's first author Gaurav Nirala and co-authors Siva T. Pradyumna   
   and Ashok Kumar.   
      
   Marino also holds positions with OU's Center for Quantum Research and   
   Technology and with the Quantum Science Center, Oak Ridge National   
   Laboratory.   
      
   "The idea behind the project is to be able to use the spatial properties   
   of the light to encode large amounts of information, just like how an   
   image contains information. However, to be able to do so in a way that is   
   compatible with quantum networks for secure information transfer. When   
   you consider an image, it can be constructed by combining basic spatial   
   patterns know as modes, and depending on how you combine these modes,   
   you can change the image or encoded information," Marino said.   
      
   "What we're doing here that is new and different is that we're not just   
   using those modes to encode information; we're using the correlations   
   between them," he added. "We're using the additional information on how   
   those modes are linked to encode the information."  The researchers   
   used two entangled beams of light, meaning that the light waves are   
   interconnected with correlations that are stronger than those that can   
   be achieved with classical light and remain interconnected despite their   
   distance apart.   
      
   "The advantage of the approach we introduce is that you're not able to   
   recover the encoded information unless you perform joint measurements   
   of the two entangled beams," Marino said. "This has applications such   
   as secure communication, given that if you were to measure each beam by   
   itself, you would not be able to extract any information. You have to   
   obtain the shared information between both of the beams and combine it in   
   the right way to extract the encoded information."  Through a series of   
   images and correlation measurements, the researchers demonstrated results   
   of successfully encoding information in these quantum- entangled beams of   
   light. Only when the two beams were combined using the methods intended   
   did the information resolve into recognizable information encoded in   
   the form of images.   
      
   "The experimental result describes how one can transfer spatial patterns   
   from one optical field to two new optical fields generated using a quantum   
   mechanical process called four-wave mixing," said Nirala. "The encoded   
   spatial pattern can be retrieved solely by joint measurements of generated   
   fields. One interesting aspect of this experiment is that it offers a   
   novel method of encoding information in light by modifying the correlation   
   between various spatial modes without impacting time-correlations."   
   "What this could enable, in principle, is the ability to securely encode   
   and transmit a lot of information using the spatial properties of the   
   light, just like how an image contains a lot more information than   
   just turning the light on and off," Marino said. "Using the spatial   
   correlations is a new approach to encode information."  "Information   
   encoding in the spatial correlations of entangled twin beams" was   
   published in Science Advances on June 2, 2023.   
      
       * RELATED_TOPICS   
             o Matter_&_Energy   
                   # Optics # Quantum_Computing # Quantum_Physics # Physics   
             o Computers_&_Math   
                   # Quantum_Computers # Information_Technology # Encryption   
                   # Hacking   
       * RELATED_TERMS   
             o Quantum_entanglement o Quantum_computer o   
             Wave-particle_duality o Schro"dinger's_cat o Linus_Pauling o   
             Quantum_dot o Quantum_number o Uncertainty_principle   
      
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   Story Source: Materials provided by University_of_Oklahoma. Original   
   written by Chelsea Julian. Note: Content may be edited for style and   
   length.   
      
      
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   Journal Reference:   
      1. Gaurav Nirala, Siva T. Pradyumna, Ashok Kumar, Alberto M. Marino.   
      
         Information encoding in the spatial correlations of entangled   
         twin beams.   
      
         Science Advances, 2023; 9 (22) DOI: 10.1126/sciadv.adf9161   
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   Link to news story:   
   https://www.sciencedaily.com/releases/2023/06/230605181236.htm   
      
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