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论文类型：期刊论文

发表时间：2017-09-01

发表刊物：QUANTUM INFORMATION PROCESSING

收录刊物：SCIE、EI、Scopus

卷号：16

期号：9

ISSN号：1570-0755

关键字：CircuitQED; Cross-Kerr nonlinearity; Controlled-phase gate; Entangled coherent state

摘要：The realization of cross-Kerr nonlinearity is an important task for many applications in quantum information processing. In thiswork, we propose amethod for realizing cross-Kerr nonlinearity interaction between two superconducting coplanar waveguide resonators coupled by a three-level superconducting flux qutrit (coupler). Because the resonator photons are virtually excited and the coupler is unexcited for the entire process, the effect of resonator decay and the coupler decoherence are greatly minimized. More importantly, compared with the previous proposals, our proposal does not require classical pulses. Furthermore, due to use of only a three-level qutrit, the experimental setup is much simplified when compared with previous proposals requiring a four-level artificial atomic systems. In addition, we implement a two-resonator qubits controlled-phase gate and generate a two-resonator entangled coherent state. Numerical simulation shows that the high-fidelity implementation of the phase gate and creation of the entangled coherent state are feasible with current circuit QED technology.