One-step implementation of a multi-target-qubit controlled phase gate with cat-state qubits in circuit QED


We propose a single-step implementation of a muti-target-qubit controlled phase gate with one catstate qubit (cqubit) simultaneously controlling n–1 target cqubits. The two logic states of a cqubit are represented by two orthogonal cat states of a single cavity mode. In this proposal, the gate is implemented with n microwave cavities coupled to a superconducting transmon qutrit. Because the qutrit remains in the ground state during the gate operation, decoherence caused due to the qutrit’s energy relaxation and dephasing is greatly suppressed. The gate implementation is quite simple because only a single-step operation is needed and neither classical pulse nor measurement is required. Numerical simulations demonstrate that high-fidelity realization of a controlled phase gate with one cqubit simultaneously controlling two target cqubits is feasible with present circuit QED technology. This proposal can be extended to a wide range of physical systems to realize the proposed gate, such as multiple microwave or optical cavities coupled to a natural or artificial three-level atom.

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This work was supported in part by the NKRDP of China (Grant No. 2016YFA0301802) and the National Natural Science Foundation of China under Grant Nos. 11074062, 11374083, and 11774076. This work was also supported by the Hangzhou-City grant for Quantum Information and Quantum Optics Innovation Research Team.

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Correspondence to Chui-Ping Yang.

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Fan, Y., Zheng, Z., Zhang, Y. et al. One-step implementation of a multi-target-qubit controlled phase gate with cat-state qubits in circuit QED. Front. Phys. 14, 21602 (2019).

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  • circuit QED
  • cat-state
  • multi-target-qubit controlled phase gate