Efficient transfer of an arbitrary qutrit state in circuit QED

  1. Tong Liu,
  2. Shao-Jie Xiong,
  3. Xiao-Zhi Cao,
  4. Qi-Ping Su,
  5. and Chui-Ping Yang
Compared with a qubit, a qutrit (i.e., three-level quantum system) has a larger Hilbert space and thus can be used to encode more information in quantum information processing and communication.
Here, we propose a scheme to transfer an arbitrary quantum state between two flux qutrits coupled to two resonators. This scheme is simple because it only requires two basic operations. The state-transfer operation can be performed fast because of using resonant interactions only. Numerical simulations show that high-fidelity transfer of quantum states between the two qutrits is feasible with current circuit-QED technology. This scheme is quite general and can be applied to accomplish the same task for other solid-state qutrits coupled to resonators.