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

Frontiers of physics 2019年第2期14卷 13-21页

作者： You-Ji Fan Zhen-Fei Zheng Yu Zhang Dao-Ming Lu Chui-Ping Yang College of Mechanic and Electronic Engineering Wuyi UniversityWuyishan 354300China CAS Key Laboratory of Quantum Information University of Science and Technology of ChinaHefei 230026China School of Physics Nanjing UniversityNanjing 210093China Quantum Information Research Center Shangrao Normal UniversityShangrao 334001China Department of Physics Hangzhou Normal UniversityHangzhou 310036China

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 c.qubit 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 transnion qutrit. Because the qutrit remains in the ground state during the gate operation, decoherence caused due to the qutrit5s energy relaxation and dephasing is greatly suppressed. The gate implementation is quite simple because only a single-stcp 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 con trolling two targe t 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.

关键词： circuit QED cat-state multi-target-qubit controlled phase gate

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Transferring entangled states of photonic cat-state qubits in circuit QED

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Frontiers of physics 2020年第2期15卷 27-37页

作者： Tong Liu Zhen-Fei Zheng Yu Zhang Yu-Liang Fang Chui-Ping Yang Quantum Information Research Center Shangrao Normal UniversityShangrao 334001China Key Laboratory of Quantum Information University of Science and Technology of ChinaHeifei 230026China School of Physics Nanjing UniversityNanjing 210093China

We propose a method for transferring quantum entangled states of two photonic cat-state qubits(cqubits)from two microwave cavities to the other two microwave cavities.This proposal is realized by using four microwave cavities coupled to a superconducting flux qutrit.Because of using four cavities with different frequencies,the inter-cavity crosstalk is significantly reduced.Since only one coupler qutrit is used,the circuit resource is minimized.The entanglement transfer is completed with a singlestep operation only,thus this proposal is quite simple.The third energy level of the coupler qutrit is not populated during the state transfer,therefore decoherence from the higher energy level is greatly suppressed.Our numerical simulations show that high-fidelity transfer of two-cqubit entangled states from two transmission line resonators to the other two transmission line resonators is feasible with current circuit QED technology.This proposal is universal and can be applied to accomplish the same task in a wide range of physical systems,such as four microwave or optical cavities,which are coupled to a natural or artificial three-level atom.

关键词： transferring quantum entangled states photonic cat-state microwave cavities

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