Spin-Boson Quantum Phase Transition in Multilevel Superconducting Qubits

  title={Spin-Boson Quantum Phase Transition in Multilevel Superconducting Qubits},
  author={Kuljeet Kaur and Th{\'e}o S{\'e}pulcre and Nicolas Roch and Izak M. Snyman and Serge Florens and Soumya Bera},
  journal={Physical Review Letters},
Superconducting circuits are currently developed as a versatile platform for the exploration of many-body physics, by building on non-linear elements that are often idealized as two-level qubits. A classic example is given by a charge qubit that is capacitively coupled to a transmission line, which leads to the celebrated spin-boson description of quantum dissipation. We show that the intrinsic multilevel structure of superconducting qubits drastically restricts the validity of the spinboson… 

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