MSGID: 1:317/3 64475763   
   PID: hpt/lnx 1.9.0-cur 2019-01-08   
   TID: hpt/lnx 1.9.0-cur 2019-01-08   
    Scientists have full state of a quantum liquid down cold    
    New research, using ultracold atoms, reveals particular properties of   
   quantum systems    
      
     Date:   
         April 24, 2023   
     Source:   
         New York University   
     Summary:   
         A team of physicists has illuminated certain properties of quantum   
         systems by observing how their fluctuations spread over time. The   
         research offers an intricate understanding of a complex phenomenon   
         that is foundational to quantum computing.   
      
      
         Facebook Twitter Pinterest LinkedIN Email   
      
   ==========================================================================   
   FULL STORY   
   ==========================================================================   
   A team of physicists has illuminated certain properties of quantum systems   
   by observing how their fluctuations spread over time. The research offers   
   an intricate understanding of a complex phenomenon that is foundational   
   to quantum computing -- a method that can perform certain calculations   
   significantly more efficiently than conventional computing.   
      
   "In an era of quantum computing it's vital to generate a precise   
   characterization of the systems we are building," explains Dries Sels, an   
   assistant professor in New York University's Department of Physics and an   
   author of the paper, which appears in the journal Nature Physics. "This   
   work reconstructs the full state of a quantum liquid, consistent with   
   the predictions of a quantum field theory -- similar to those that   
   describe the fundamental particles in our universe."  Sels adds that   
   the breakthrough offers promise for technological advancement.   
      
   "Quantum computing relies on the ability to generate entanglement   
   between different subsystems, and that's exactly what we can probe with   
   our method," he notes. "The ability to do such precise characterization   
   could also lead to better quantum sensors -- another application area of   
   quantum technologies."  The research team, which included scientists from   
   Vienna University of Technology, ETH Zurich, Free University of Berlin,   
   and the Max-Planck Institute of Quantum Optics, performed a tomography   
   of a quantum system -- the reconstruction of a specific quantum state   
   with the aim of seeking experimental evidence of a theory.   
      
   The studied quantum system consisted of ultracold atoms -- slow-moving   
   atoms that make the movement easier to analyze because of their near-zero   
   temperature -- trapped on an atom chip.   
      
   In their work, the scientists created two "copies" of this quantum system   
   - - cigar-shaped clouds of atoms that evolve over time without influencing   
   each other. At different stages of this process, the team performed a   
   series of experiments that revealed the two copies' correlations.   
      
   "By constructing an entire history of these correlations, we can   
   infer what is the initial quantum state of the system and extract   
   its properties," explains Sels. "Initially, we have a very strongly   
   coupled quantum liquid, which we split into two so that it evolves as   
   two independent liquids, and then we recombine it to reveal the ripples   
   that are in the liquid.   
      
   "It's like watching the ripples in a pond after throwing a rock in   
   it and inferring the properties of the rock, such as its size, shape,   
   and weight."  This research was supported by grants from the Air Force   
   Office of Scientific Research (FA9550-21-1-0236) and the U.S. Army   
   Research Office (W911NF-20-1- 0163) as well as the Austrian Science Fund   
   (FWF) and the German Research Research Foundation (DRG).   
      
       * RELATED_TOPICS   
             o Matter_&_Energy   
                   # Physics # Quantum_Physics # Quantum_Computing #   
                   Spintronics   
             o Computers_&_Math   
                   # Quantum_Computers # Computers_and_Internet #   
                   Spintronics_Research # Encryption   
       * RELATED_TERMS   
             o Quantum_entanglement o Quantum_computer o Quantum_number o   
             Electron_configuration o Supercomputer o Wave-particle_duality   
             o Physics o John_von_Neumann   
      
   ==========================================================================   
   Story Source: Materials provided by New_York_University. Note: Content   
   may be edited for style and length.   
      
      
   ==========================================================================   
   Journal Reference:   
      1. Mohammadamin Tajik, Ivan Kukuljan, Spyros Sotiriadis, Bernhard   
      Rauer,   
         Thomas Schweigler, Federica Cataldini, Joa~o Sabino, Frederik   
         Mo/ller, Philipp Schu"ttelkopf, Si-Cong Ji, Dries Sels, Eugene   
         Demler, Jo"rg Schmiedmayer. Verification of the area law of mutual   
         information in a quantum field simulator. Nature Physics, 2023;   
         DOI: 10.1038/s41567-023- 02027-1   
   ==========================================================================   
      
   Link to news story:   
   https://www.sciencedaily.com/releases/2023/04/230424133553.htm   
      
   --- up 1 year, 8 weeks, 10 hours, 50 minutes   
    * Origin: -=> Castle Rock BBS <=- Now Husky HPT Powered! (1:317/3)   
   SEEN-BY: 15/0 106/201 114/705 123/120 153/7715 218/700 226/30 227/114   
   SEEN-BY: 229/110 112 113 307 317 400 426 428 470 664 700 292/854 298/25   
   SEEN-BY: 305/3 317/3 320/219 396/45   
   PATH: 317/3 229/426