One-step resonant controlled-phase gate on distant transmon qutrits in different 1D superconducting resonators.
We propose a scheme to construct the controlled-phase (c-phase) gate on distant transmon qutrits hosted in different resonators inter-coupled by a connected transmon qutrit. Different from previous works for entanglement generation and information transfer on two distant qubits in a dispersive regime in the similar systems, our gate is constructed in the resonant regime with one step. The numerical simulation shows that the fidelity of our c-phase gate is 99.5% within 86.3 ns. As an interesting application of our c-phase gate, we propose an effective scheme to complete a conventional square lattice of two-dimensional surface code layout for fault-tolerant quantum computing on the distant transmon qutrits. The four-step coupling between the nearest distant transmon qutrits, small coupling strengths of the distant transmon qutrits, and the non-population on the connection transmon qutrit can reduce the interactions among different parts of the layout effectively, which makes the layout be integrated with a large scale in an easier way.
State Key Laboratory of Low-Dimensional Quantum Physics and Department of Physics, Tsinghua University, Beijing 100084, China.|Tsinghua National Laboratory for Information Science and Technology, Beijing 100084, China.|Collaborative Innovation Center of Quantum Matter, Beijing 100084, China.|Department of Physics, Applied Optics Beijing Area Major Laboratory, Beijing Normal University, Beijing 100875, China.
Ming
M
Hua
Department of Physics, Applied Optics Beijing Area Major Laboratory, Beijing Normal University, Beijing 100875, China.
Ming-Jie
MJ
Tao
Department of Physics, Applied Optics Beijing Area Major Laboratory, Beijing Normal University, Beijing 100875, China.
Fu-Guo
FG
Deng
State Key Laboratory of Low-Dimensional Quantum Physics and Department of Physics, Tsinghua University, Beijing 100084, China.|Tsinghua National Laboratory for Information Science and Technology, Beijing 100084, China.|Collaborative Innovation Center of Quantum Matter, Beijing 100084, China.
Gui
G
Lu Long
D017785:Photons; D011789:Quantum Theory; D013816:Thermodynamics