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Оптичко друштво Србије

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Сенка Ћук у "Nature"

Др Сенка Ћук објавила рад у престижном часопису "Nature"


Др Сенка Ћук, научни радник Института за физику Универзитета у Београду, објавила је са групом иностраних аутора рад у престижном часопису "Nature" (pdf):

 

  • Entanglement with negative Wigner function of almost 3,000 atoms heralded by one photon
    • Robert McConnell, Hao Zhang, Jiazhong Hu, Senka Ćuk & Vladan Vuletić
    • Nature 519 (2015), 439 (doi: 10.1038/nature14293)
    • Abstract:  Quantum-mechanically correlated (entangled) states of many particles are of interest in quantum information, quantum computing and quantum metrology. Metrologically useful entangled states of large atomic ensembles have been experimentally realized1–10, but these states display Gaussian spin distribution functions with a non-negative Wigner quasiprobability distribution function. NonGaussian entangled states have been produced in small ensembles of ions11,12, and very recently in large atomic ensembles13–15. Here we generate entanglement in a large atomic ensemble via an interaction with a very weak laser pulse; remarkably, the detection of a single photon prepares several thousand atoms in an entangled state. We reconstruct a negative-valued Wigner function—an important hallmark of non-classicality—and verify an entanglement depth (the minimum number of mutually entangled atoms) of 2,910 6 190 out of 3,100 atoms. Attaining such a negative Wigner function and the mutual entanglement of virtually all atoms is unprecedented for an ensemble containing more than a few particles. Although the achieved purity of the state is slightly below the threshold for entanglement-induced metrological gain, further technical improvement should allow the generation of states that surpass this threshold, and of more complex Schro¨dinger cat states for quantum metrology and information processing. More generally, our results demonstrate the power of heralded methods for entanglement generation, and illustrate how the information contained in a single photon can drastically alter the quantum state of a large system.

 

Др Ћук је члан Оптичког друштва Србије и од срца јој честитамо.

Извор:

  1. Massachusetts Institute of Technology, Research Laboratory of Electronics > Experimental Atomic Physics, Vladan Vuletic group (Технолошки институт Масачусетса, Истраживачка лабораторија за електронику > Експериментална атомска физика, Група Владана Вулетића)
  2. J. Chu: "Thousand of Atoms entangled with a single photon", MIT News, March 25, 2015 (Вести Технолошког института Масачусетса)