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

You-Ji Fan, Zhen-Fei Zheng, Yu Zhang, Dao-Ming Lu, Chui-Ping Yang

Front. Phys. ›› 2019, Vol. 14 ›› Issue (2) : 21602.

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Front. Phys. ›› 2019, Vol. 14 ›› Issue (2) : 21602. DOI: 10.1007/s11467-018-0875-y
RESEARCH ARTICLE
RESEARCH ARTICLE

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

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Abstract

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.

Keywords

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

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You-Ji Fan, Zhen-Fei Zheng, Yu Zhang, Dao-Ming Lu, Chui-Ping Yang. One-step implementation of a multi-target-qubit controlled phase gate with cat-state qubits in circuit QED. Front. Phys., 2019, 14(2): 21602 https://doi.org/10.1007/s11467-018-0875-y

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