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Spontaneous emission is a fundamental phenomenon explained by the quantized light field. In an ensemble of atoms, however, the field will build up interactions between the atoms, and significantly change the behavior of spontaneous emission. In this talk, we start from an exactly solvable model of a spin (two-level system) chain chirally coupled to a 1D photonic waveguide, and introduce our experimental proposal for its realizations in superconducting circuits. We study how the long-range light-mediated interactions change the collective spontaneous emission. We find some properties that are universal regardless of the underlying photonic reservoir, including a power-law scaling of the suppressed decay rate of the subradiant states, and multiply-excited states interpreted as Jordan-Wigner fermions or Tonks-Girardeau bosons.
Dr. Yu-Xiang Zhang obtained his bachelor degree at the School of Gifted Young (00 class) of the University of Science and Technology of China in 2012, and received the PhD degree in quantum information from the Hefei National Laboratory for Physical Sciences at the Microscale in 2016. Then he moved to Aarhus University (Denmark) to study quantum optics as a postdoc. Now he is working at the Niels Bohr Institute of the Copenhagen University. He has general research interests in quantum information and quantum optics.