Efficient scheme for realizing a multiplex-controlled phase gate with photonic qubits in circuit quantum electrodynamics

作     者：Qi-Ping Su Yu Zhang Liang Bin Chui-Ping Yang Qi-Ping Su;Yu Zhang;Liang Bin;Chui-Ping Yang

作者机构：School of PhysicsHangzhou Normal UniversityHangzhou 311121China School of PhysicsNanjing UniversityNanjing 210093China Quantum Information Research CenterShangrao Normal UniversityShangrao 334001China 

出 版 物：《Frontiers of physics》 (物理学前沿（英文版）)

年 卷 期：2022年第17卷第5期

页      面：125-135页

核心收录：

学科分类：07[理学] 070201[理学-理论物理] 0702[理学-物理学] 

基　　金：This work was partly supported by the National Natural Science Foundation of China(NSFC)(Nos.11074062,11374083,11774076,U21A20436) the Key-Area Research and Development Program of GuangDong Province(No.2018B030326001) the Jiangxi Natural Science Foundation(No.20192ACBL20051) 

主　　题：multiplex controlled phase gate circuit QED 

摘      要：We propose an efficient scheme to implement a multiplex-controlled phase gate with multiple photonic qubits simultaneously controlling one target photonic qubit based on circuit quantum electrodynamics(QED).For convenience,we denote this multiqubit gate as MCP *** gate is realized by using a two-level coupler to couple multiple *** coupler here is a superconducting *** scheme is simple because the gate implementation requires only one step of *** addition,this scheme is quite general because the two logic states of each photonic qubit can be encoded with a vacuum state and an arbitrary non-vacuum state|φ(e.g.,a Fock state,a superposition of Fock states,a cat state,or a coherent state,etc.)which is orthogonal or quasi-orthogonal to the vacuum *** scheme has some additional advantages:because only two levels of the coupler are used,i.e.,no auxiliary levels are utilized,decoherence from higher energy levels of the coupler is avoided;the gate operation time does not depend on the number of qubits;and the gate is implemented deterministically because no measurement is *** an example,we numerically analyze the circuit-QED based experimental feasibility of implementing a three-qubit MCP gate with photonic qubits each encoded via a vacuum state and a cat *** scheme can be applied to accomplish the same task in a wide range of physical system,which consists of multiple microwave or optical cavities coupled to a two-level coupler such as a natural or artificial atom.